diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5df28185..be50695c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -36,6 +36,7 @@ deploy_to_test:
     script:
         - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/cara-router/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
         - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/cara-webservice/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
+        - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/cara-calculator-open/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
         - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/auth-service/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
 
 
diff --git a/README.md b/README.md
index f0653b89..c0c18d46 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # CARA - COVID Airborne Risk Assessment
 
-CARA is a risk assessment tool developed to model the concentration of viruses in enclosed spaces, in order to inform space-management decisions. 
+CARA is a risk assessment tool developed to model the concentration of viruses in enclosed spaces, in order to inform space-management decisions.
 
 CARA models the concentration profile of potential infectious viruses in enclosed spaces with clear and intuitive graphs.
 The user can set a number of parameters, including room volume, exposure time, activity type, mask-wearing and ventilation.
@@ -23,7 +23,7 @@ The objective is to facilitate targeted decision-making and investment through c
 While the SARS-CoV-2 virus is in circulation among the population, the notion of 'zero risk' or 'completely safe scenario' does not exist.
 Each event modelled is unique, and the results generated therein are only as accurate as the inputs and assumptions.
 
-## Authors 
+## Authors
 CARA was developed by following members of CERN - European Council for Nuclear Research (visit https://home.cern/):
 
 Andre Henriques<sup>1</sup>, Marco Andreini<sup>1</sup>, Gabriella Azzopardi<sup>2</sup>, James Devine<sup>3</sup>, Philip Elson<sup>4</sup>, Nicolas Mounet<sup>2</sup>, Markus Kongstein Rognlien<sup>2,6</sup>, Nicola Tarocco<sup>5</sup>
@@ -70,7 +70,7 @@ Once you have used the scripts, the hourly temperature data for your location sh
     'Feb': [0.9, 0.3, 0.0, -0.5, -0.7, -1.1, -1.2, -1.1, -0.7, 0.8, 2.5,
     4.2, 5.4, 6.2, 6.3, 6.2, 6.1, 5.5, 4.5, 4.1, 3.5, 2.8, 2.5, 2.0],...`
 
-CARA currently supports **only one geographic location for weather data per instance**. 
+CARA currently supports **only one geographic location for weather data per instance**.
 
 ## Running CARA locally
 
@@ -80,7 +80,7 @@ In order to run cara locally with docker, run the following:
 
     $ docker run -it -p 8080:8080 gitlab-registry.cern.ch/cara/cara/calculator
 
-This will start a local version of CARA, which can be visited at http://localhost:8080/. 
+This will start a local version of CARA, which can be visited at http://localhost:8080/.
 
 
 ## Development guide
@@ -98,6 +98,12 @@ To run with the CERN theme:
 python -m cara.apps.calculator --theme=cara/apps/calculator/themes/cern
 ```
 
+To run the calculator on a different URL path:
+
+```
+python -m cara.apps.calculator --prefix=/mycalc
+```
+
 ### Running the CARA Expert-App app in development mode
 
 ```
diff --git a/app-config/nginx/nginx.conf b/app-config/nginx/nginx.conf
index 8104caa3..e2e45836 100644
--- a/app-config/nginx/nginx.conf
+++ b/app-config/nginx/nginx.conf
@@ -99,13 +99,22 @@ http {
         }
 
         location /calculator {
-            # Anything under calculator is authenticated.
+            return 302 /calculator-cern;
+        }
+
+        location /calculator-cern {
+            # CERN calculator is authenticated.
             auth_request /auth/probe;
             error_page 401 = @error401;
 
             # cara-webservice is the name of the tornado server (for the calculator)
             # in each of docker-compose, test-cara.web.cern.ch and cara.web.cern.ch.
-            proxy_pass http://cara-webservice:8080/calculator;
+            proxy_pass http://cara-webservice:8080/calculator-cern;
+        }
+
+        location /calculator-open {
+            # Public open calculator
+            proxy_pass http://cara-calculator-open:8080/calculator-open;
         }
     }
 }
diff --git a/app-config/openshift/application.yaml b/app-config/openshift/application.yaml
index 03c3c103..6d6f2c32 100644
--- a/app-config/openshift/application.yaml
+++ b/app-config/openshift/application.yaml
@@ -198,7 +198,7 @@
                 env:
                 - name: APP_NAME
                   value: cara-voila
-                image: '${PROJECT_NAME}/cara-webservice'
+                image: '${PROJECT_NAME}/cara-app'
                 ports:
                   - containerPort: 8080
                     protocol: TCP
@@ -211,7 +211,7 @@
                 - cara-app
               from:
                 kind: ImageStreamTag
-                name: 'cara-webservice:latest'
+                name: 'cara-app:latest'
                 namespace: ${PROJECT_NAME}
     -
       apiVersion: v1
@@ -267,8 +267,10 @@
                       name: auth-service-secrets
                 - name: APP_NAME
                   value: cara-webservice
+                - name: CARA_CALCULATOR_PREFIX
+                  value: /calculator-cern
                 - name: CARA_THEME
-                    value: cara/apps/calculator/themes/cern
+                  value: cara/apps/calculator/themes/cern
                 image: '${PROJECT_NAME}/cara-webservice'
                 ports:
                   - containerPort: 8080
@@ -285,6 +287,41 @@
                 name: 'cara-webservice:latest'
                 namespace: ${PROJECT_NAME}
           - type: ConfigChange
+    -
+      apiVersion: v1
+      kind: DeploymentConfig
+      metadata:
+        name: cara-calculator-open
+      spec:
+        replicas;: 1
+        template:
+          metadata:
+            labels:
+              app: cara-calculator-open
+          spec:
+            containers:
+              - name: cara-calculator-open
+                env:
+                - name: APP_NAME
+                  value: cara-webservice
+                - name: CARA_CALCULATOR_PREFIX
+                  value: /calculator-open
+                image: '${PROJECT_NAME}/cara-webservice'
+                ports:
+                  - containerPort: 8080
+                    protocol: TCP
+        triggers:
+          - type: ConfigChange
+          - type: ImageChange
+            imageChangeParams:
+              automatic: true
+              containerNames:
+                - cara-calculator-open
+              from:
+                kind: ImageStreamTag
+                name: 'cara-webservice:latest'
+                namespace: ${PROJECT_NAME}
+          - type: ConfigChange
 
   parameters:
     - name: PROJECT_NAME
diff --git a/app-config/openshift/services.yaml b/app-config/openshift/services.yaml
index 6e39cb6c..a8c0c4fe 100644
--- a/app-config/openshift/services.yaml
+++ b/app-config/openshift/services.yaml
@@ -10,6 +10,21 @@
   labels:
     template: "cara-services"
   objects:
+    -
+      apiVersion: v1
+      kind: Service
+      metadata:
+        labels:
+          app: auth-service
+        name: auth-service
+      spec:
+        ports:
+          - name: 8080-tcp
+            port: 8080
+            protocol: TCP
+            targetPort: 8080
+        selector:
+          deploymentconfig: auth-service
     -
       apiVersion: v1
       kind: Service
@@ -24,7 +39,7 @@
             protocol: TCP
             targetPort: 8080
         selector:
-          app: cara-app
+          deploymentconfig: cara-app
     -
       apiVersion: v1
       kind: Service
@@ -43,7 +58,7 @@
             protocol: TCP
             targetPort: 8443
         selector:
-          app: cara-router
+          deploymentconfig: cara-router
     -
       apiVersion: v1
       kind: Service
@@ -58,4 +73,19 @@
             protocol: TCP
             targetPort: 8080
         selector:
-          app: cara-webservice
+          deploymentconfig: cara-webservice
+    -
+      apiVersion: v1
+      kind: Service
+      metadata:
+        labels:
+          app: cara-calculator-open
+        name: cara-calculator-open
+      spec:
+        ports:
+          - name: 8080-tcp
+            port: 8080
+            protocol: TCP
+            targetPort: 8080
+        selector:
+          deploymentconfig: cara-calculator-open
diff --git a/app.sh b/app.sh
index 1aa80c4a..023c0def 100755
--- a/app.sh
+++ b/app.sh
@@ -10,6 +10,10 @@ if [[ "$APP_NAME" == "cara-webservice" ]]; then
         args+=("--theme=${CARA_THEME}")
     fi
 
+    if [ ! -z "$CARA_CALCULATOR_PREFIX" ]; then
+        args+=("--prefix=${CARA_CALCULATOR_PREFIX}")
+    fi
+
     echo "Starting the cara webservice with: python -m cara.apps.calculator ${args[@]}"
     python -m cara.apps.calculator "${args[@]}"
 elif [[ "$APP_NAME" == "cara-voila" ]]; then
diff --git a/cara/apps/calculator/__init__.py b/cara/apps/calculator/__init__.py
index 57376206..d84eeaeb 100644
--- a/cara/apps/calculator/__init__.py
+++ b/cara/apps/calculator/__init__.py
@@ -66,6 +66,7 @@ class BaseRequestHandler(RequestHandler):
             print(traceback.format_exc())
         self.finish(template.render(
             user=self.current_user,
+            calculator_prefix=self.settings["calculator_prefix"],
             active_page='Error',
             contents=contents
         ))
@@ -79,6 +80,7 @@ class Missing404Handler(BaseRequestHandler):
             "page.html.j2")
         self.finish(template.render(
             user=self.current_user,
+            calculator_prefix=self.settings["calculator_prefix"],
             active_page='Error',
             contents='Unfortunately the page you were looking for does not exist.<br><br><br><br>'
         ))
@@ -123,7 +125,10 @@ class LandingPage(BaseRequestHandler):
     def get(self):
         template = self.settings["template_environment"].get_template(
             "index.html.j2")
-        report = template.render(user=self.current_user)
+        report = template.render(
+            user=self.current_user,
+            calculator_prefix=self.settings["calculator_prefix"],
+        )
         self.finish(report)
 
 
@@ -133,6 +138,7 @@ class AboutPage(BaseRequestHandler):
         template = template_environment.get_template("about.html.j2")
         report = template.render(
             user=self.current_user,
+            calculator_prefix=self.settings["calculator_prefix"],
             active_page="about",
             text_blocks=template_environment.globals['common_text']
         )
@@ -146,6 +152,7 @@ class CalculatorForm(BaseRequestHandler):
         report = template.render(
             user=self.current_user,
             xsrf_form_html=self.xsrf_form_html(),
+            calculator_prefix=self.settings["calculator_prefix"],
             calculator_version=__version__,
         )
         self.finish(report)
@@ -160,7 +167,7 @@ class CompressedCalculatorFormInputs(BaseRequestHandler):
         except Exception as err:  # noqa
             self.set_status(400)
             return self.finish("Invalid calculator data: it seems incomplete. Was there an error copying & pasting the URL?")
-        self.redirect(f'/calculator?{args}')
+        self.redirect(f'{self.settings["calculator_prefix"]}?{args}')
 
 
 class ReadmeHandler(BaseRequestHandler):
@@ -168,14 +175,15 @@ class ReadmeHandler(BaseRequestHandler):
         template = self.settings['template_environment'].get_template("userguide.html.j2")
         readme = template.render(
             active_page="calculator/user-guide",
-            user=self.current_user
+            user=self.current_user,
+            calculator_prefix=self.settings["calculator_prefix"],
         )
         self.finish(readme)
 
 
 def make_app(
         debug: bool = False,
-        prefix: str = '/calculator',
+        calculator_prefix: str = '/calculator',
         theme_dir: typing.Optional[Path] = None,
 ) -> Application:
     static_dir = Path(__file__).absolute().parent.parent / 'static'
@@ -185,11 +193,11 @@ def make_app(
         (r'/_c/(.*)', CompressedCalculatorFormInputs),
         (r'/about', AboutPage),
         (r'/static/(.*)', StaticFileHandler, {'path': static_dir}),
-        (prefix + r'/?', CalculatorForm),
-        (prefix + r'/report', ConcentrationModel),
-        (prefix + r'/baseline-model/result', StaticModel),
-        (prefix + r'/user-guide', ReadmeHandler),
-        (prefix + r'/static/(.*)', StaticFileHandler, {'path': calculator_static_dir}),
+        (calculator_prefix + r'/?', CalculatorForm),
+        (calculator_prefix + r'/report', ConcentrationModel),
+        (calculator_prefix + r'/baseline-model/result', StaticModel),
+        (calculator_prefix + r'/user-guide', ReadmeHandler),
+        (calculator_prefix + r'/static/(.*)', StaticFileHandler, {'path': calculator_static_dir}),
     ]
 
     cara_templates = Path(__file__).parent.parent / "templates"
@@ -210,9 +218,10 @@ def make_app(
     return Application(
         urls,
         debug=debug,
+        calculator_prefix=calculator_prefix,
         template_environment=template_environment,
         default_handler_class=Missing404Handler,
-        report_generator=ReportGenerator(loader),
+        report_generator=ReportGenerator(loader, calculator_prefix),
         xsrf_cookies=True,
         # COOKIE_SECRET being undefined will result in no login information being
         # presented to the user.
diff --git a/cara/apps/calculator/__main__.py b/cara/apps/calculator/__main__.py
index 0cfafe66..10298c84 100644
--- a/cara/apps/calculator/__main__.py
+++ b/cara/apps/calculator/__main__.py
@@ -16,6 +16,11 @@ def configure_parser(parser) -> argparse.ArgumentParser:
         help="A directory containing extensions for templates and static data",
         default=None,
     )
+    parser.add_argument(
+        "--prefix",
+        help="Change the URL path prefix to the calculator app",
+        default="/calculator"
+    )
     return parser
 
 
@@ -27,7 +32,7 @@ def main():
         theme_dir = Path(theme_dir).absolute()
         assert theme_dir.exists()
         assert (theme_dir / 'templates').exists()
-    app = make_app(debug=args.no_debug, theme_dir=theme_dir)
+    app = make_app(debug=args.no_debug, calculator_prefix=args.prefix, theme_dir=theme_dir)
     app.listen(8080)
     IOLoop.instance().start()
 
diff --git a/cara/apps/calculator/report_generator.py b/cara/apps/calculator/report_generator.py
index 4029e54f..ab206ec9 100644
--- a/cara/apps/calculator/report_generator.py
+++ b/cara/apps/calculator/report_generator.py
@@ -71,7 +71,7 @@ def calculate_report_data(model: models.ExposureModel):
     }
 
 
-def generate_qr_code(prefix, form: FormData):
+def generate_qr_code(base_url, calculator_prefix, form: FormData):
     form_dict = FormData.to_dict(form, strip_defaults=True)
 
     # Generate the calculator URL arguments that would be needed to re-create this
@@ -80,10 +80,9 @@ def generate_qr_code(prefix, form: FormData):
 
     # Then zlib compress + base64 encode the string. To be inverted by the
     # /_c/ endpoint.
-    qr_url = prefix + "/_c/" + base64.b64encode(
-        zlib.compress(args.encode())
-    ).decode()
-    url = prefix + "/calculator?" + args
+    compressed_args = base64.b64encode(zlib.compress(args.encode())).decode()
+    qr_url = f"{base_url}/_c/{compressed_args}"
+    url = f"{base_url}{calculator_prefix}?{args}"
 
     qr = qrcode.QRCode(
         version=1,
@@ -281,6 +280,7 @@ def comparison_report(scenarios: typing.Dict[str, models.ExposureModel]):
 @dataclasses.dataclass
 class ReportGenerator:
     jinja_loader: jinja2.BaseLoader
+    calculator_prefix: str
 
     def build_report(self, base_url: str, form: FormData) -> str:
         model = form.build_model()
@@ -300,7 +300,8 @@ class ReportGenerator:
         context.update(calculate_report_data(model))
         alternative_scenarios = manufacture_alternative_scenarios(form)
         context['alternative_scenarios'] = comparison_report(alternative_scenarios)
-        context['qr_code'] = generate_qr_code(base_url, form)
+        context['qr_code'] = generate_qr_code(base_url, self.calculator_prefix, form)
+        context['calculator_prefix'] = self.calculator_prefix
         return context
 
     def _template_environment(self) -> jinja2.Environment:
diff --git a/cara/apps/calculator/templates/base/calculator.report.html.j2 b/cara/apps/calculator/templates/base/calculator.report.html.j2
index cb57d045..043578e6 100644
--- a/cara/apps/calculator/templates/base/calculator.report.html.j2
+++ b/cara/apps/calculator/templates/base/calculator.report.html.j2
@@ -6,7 +6,7 @@
 
   	<title>Report | CARA (COVID Airborne Risk Assessment)</title>
 
-	<link rel="stylesheet" type="text/css" href="/calculator/static/css/report.css">
+	<link rel="stylesheet" type="text/css" href="{{ calculator_prefix }}/static/css/report.css">
 	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
 </head>
 
@@ -270,7 +270,7 @@
 	<br><br><br>
 	<div style="border: 2px solid black; padding: 15px;">
 	    {% block disclaimer %}
-		<p class="image"> <img align="middle" src="/calculator/static/images/disclaimer.jpg" width="40" height="40"><b>Disclaimer:</b><br><br></p>
+		<p class="image"> <img align="middle" src="{{ calculator_prefix }}/static/images/disclaimer.jpg" width="40" height="40"><b>Disclaimer:</b><br><br></p>
 
         <p>
             CARA is a risk assessment tool developed to model the concentration of viruses in enclosed spaces, in order to inform space-management decisions.
diff --git a/cara/apps/calculator/templates/calculator.form.html.j2 b/cara/apps/calculator/templates/calculator.form.html.j2
index b03dc47d..bf7840ab 100644
--- a/cara/apps/calculator/templates/calculator.form.html.j2
+++ b/cara/apps/calculator/templates/calculator.form.html.j2
@@ -5,12 +5,12 @@
 
 {% block extra_headers %}
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css" integrity="sha512-aOG0c6nPNzGk+5zjwyJaoRUgCdOrfSDhmMID2u4+OIslr0GjpLKo7Xm0Ao3xmpM4T8AmIouRkqwj1nrdVsLKEQ==" crossorigin="anonymous">
-    <link rel="stylesheet" href="/calculator/static/css/form.css">
+    <link rel="stylesheet" href="{{ calculator_prefix }}/static/css/form.css">
 {% endblock extra_headers %}
 
 {% block body_scripts %}
     <script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js" integrity="sha512-uto9mlQzrs59VwILcLiRYeLKPPbS/bT71da/OEBYEwcdNUk8jYIy+D176RYoop1Da+f9mvkYrmj5MCLZWEtQuA==" crossorigin="anonymous"></script>
-    <script src="/calculator/static/js/form.js"></script>
+    <script src="{{ calculator_prefix }}/static/js/form.js"></script>
 {% endblock body_scripts %}
 
 
@@ -28,7 +28,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
 {% if DEBUG %}
 <form id="covid_calculator" name="covid_calculator" onsubmit="return debug_submit(this)" class="form-inline">
 {% else %}
-<form id="covid_calculator" name="covid_calculator" action="/calculator/report" onsubmit="return validate_form(this)" method="POST">
+<form id="covid_calculator" name="covid_calculator" action="{{ calculator_prefix }}/report" onsubmit="return validate_form(this)" method="POST">
 {% endif %}
 {{ xsrf_form_html }}
 
@@ -129,23 +129,23 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
     <div id="DIVnatural_ventilation" class="tabbed" style="display:none">
         Number of windows: <input type="number" id="windows_number" class="non_zero" name="windows_number" min="1"><br>
         Height of window: <input type="number" step="any" id="window_height" class="non_zero" name="window_height" placeholder="meters" min="0"><br>
-        Window type: 
+        Window type:
         <input type="radio" id="window_sliding" name="window_type" value="window_sliding" onclick="require_fields(this)" checked="checked">
           <label for="window_sliding">Sliding / Side-Hung</label>&nbsp;&nbsp;
         <input type="radio" id="window_hinged" name="window_type" value="window_hinged" onclick="require_fields(this)">
           <label for="window_hinged">Top- or Bottom-Hung</label>&nbsp;&nbsp;<br>
         Width of window: <input type="number" step="any" id="window_width" class="non_zero disabled" name="window_width" placeholder="meters" min="0" data-has-radio="#window_hinged"><br>
         Opening distance: <input type="number" step="any" id="opening_distance" class="non_zero" name="opening_distance" placeholder="meters" min="0"><br>
-        Windows open:</span><br> 
+        Windows open:</span><br>
         <span class="tabbed"><input type="radio" id="windows_open_permanently" name="window_opening_regime" value="windows_open_permanently" onclick="require_fields(this)" checked="checked"></span>
           <label for="windows_open_permanently">Permanently</label><br>
         <span class="tabbed"><input type="radio" id="windows_open_periodically" name="window_opening_regime" value="windows_open_periodically" onclick="require_fields(this)"></span>
           <label for="windows_open_periodically">Periodically:</label>&nbsp;&nbsp;
-        <input type="number" step="any" id="windows_duration" class="non_zero disabled" name="windows_duration" placeholder="Duration (min)" min="1" data-has-radio="#windows_open_periodically"> / 
+        <input type="number" step="any" id="windows_duration" class="non_zero disabled" name="windows_duration" placeholder="Duration (min)" min="1" data-has-radio="#windows_open_periodically"> /
         <input type="number" step="any" id="windows_frequency" class="non_zero disabled" name="windows_frequency" placeholder="Frequency (min)" min="1" data-has-radio="#windows_open_periodically">
         <br>
     </div>
-    
+
     HEPA filtration:
     <input type="radio" id="hepa_no" name="hepa_option" value=0 onclick="require_fields(this)" checked="checked">
       <label for="hepa_no">No</label>&nbsp;&nbsp;
@@ -192,7 +192,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
     <span id="training_limit_error" class="red_text" hidden>Training activities limited to 1 infected<br></span>
     <hr width="80%">
 
-    Activity type: 
+    Activity type:
     <select id="activity_type" name="activity_type">
       <option value="office">Office</option>
       <option value="meeting">Meeting</option>
@@ -205,7 +205,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
       <option value="training">Training</option>
       <option value="gym">Gym</option>
     </select><br>
-    Exposed person(s) presence: <br>         
+    Exposed person(s) presence: <br>
     <span class="tabbed">Start: </span><input type="time" id="exposed_start" class="start_time" data-time-group="exposed" data-lunch-break="exposed_lunch" name="exposed_start" value="08:30" required> &nbsp;&nbsp;
     Finish: <input type="time" id="exposed_finish" class="finish_time" data-time-group="exposed" data-lunch-break="exposed_lunch" name="exposed_finish" value="17:30" required><br>
     Infected person(s) presence: <br>
@@ -236,7 +236,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
         <span class="tooltip_text">?</span>
       </div>
     </span><br>
-    
+
     <!-- Lunch Options -->
     <input type="checkbox" id="infected_dont_have_breaks_with_exposed" name="infected_dont_have_breaks_with_exposed" value='1' onclick="toggle_split_breaks()">
       <label for="infected_dont_have_breaks_with_exposed">Input separate breaks for infected and exposed person(s)</label><br>
@@ -248,7 +248,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
           <label for="exposed_lunch_option_no">No</label>&nbsp;&nbsp;
         <input type="radio" id="exposed_lunch_option_yes" data-lunch-select="exposed" name="exposed_lunch_option" value=1 checked="checked" onclick="require_fields(this)">
           <label for="exposed_lunch_option_yes">Yes</label><br>
-        
+
         Start: <input type="time" id="exposed_lunch_start" class="start_time" data-time-group="exposed_lunch" data-lunch-for="exposed" data-has-radio="#exposed_lunch_option_yes" name="exposed_lunch_start" value="12:30" required> &nbsp;&nbsp;
         Finish: <input type="time" id="exposed_lunch_finish" class="finish_time" data-time-group="exposed_lunch" data-lunch-for="exposed" data-has-radio="#exposed_lunch_option_yes" name="exposed_lunch_finish" value="13:30" required><br>
 
@@ -261,7 +261,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
         <input type="radio" id="exposed_coffee_break_4" name="exposed_coffee_break_option" value="coffee_break_4">
           <label for="exposed_coffee_break_4">4</label><br>
 
-        Duration (minutes): 
+        Duration (minutes):
         <select id="exposed_coffee_duration" name="exposed_coffee_duration">
           <option value="5">5</option>
           <option value="10">10</option>
@@ -282,7 +282,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
           <label for="infected_lunch_option_no">No</label>&nbsp;&nbsp;
         <input type="radio" id="infected_lunch_option_yes" data-lunch-select="infected" name="infected_lunch_option" value=1 checked="checked" onclick="require_fields(this)">
           <label for="infected_lunch_option_yes">Yes</label><br>
-        
+
         Start: <input type="time" id="infected_lunch_start" class="start_time" data-time-group="infected_lunch" data-lunch-for="infected" data-has-radio="#infected_lunch_option_yes" name="infected_lunch_start" value="12:30"> &nbsp;&nbsp;
         Finish: <input type="time" id="infected_lunch_finish" class="finish_time" data-time-group="infected_lunch" data-lunch-for="infected" data-has-radio="#infected_lunch_option_yes" name="infected_lunch_finish" value="13:30"><br>
 
@@ -295,7 +295,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
         <input type="radio" id="infected_coffee_break_4" name="infected_coffee_break_option" value="coffee_break_4">
           <label for="infected_coffee_break_4">4</label><br>
 
-        Duration (minutes): 
+        Duration (minutes):
         <select id="infected_coffee_duration" name="infected_coffee_duration">
           <option value="5">5</option>
           <option value="10">10</option>
@@ -307,7 +307,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
       </div>
       <br>
     </div>
-    
+
     <br style="clear:both;">
     <i>Coffee breaks are spread evenly throughout the day.</i><br>
     <hr width="80%">
@@ -363,7 +363,7 @@ v{{ calculator_version }} <span style="float:right; font-weight:bold">Please sen
     <li>If coffee breaks are included, they are spread out evenly throughout the day,
     in addition to any lunch break (if applicable).</li>
   </ul>
-  Refer to <a href="/calculator/user-guide"> COVID Calculator App user guide </a>
+  Refer to <a href="{{ calculator_prefix }}/user-guide"> COVID Calculator App user guide </a>
   for more detailed explanations on how to use this tool. <br>
 </div>
 
diff --git a/cara/apps/templates/about.html.j2 b/cara/apps/templates/about.html.j2
index 56d0a307..9ca990c2 100644
--- a/cara/apps/templates/about.html.j2
+++ b/cara/apps/templates/about.html.j2
@@ -3,7 +3,7 @@
 {% block contents %}
 
 <h1>Airborne Transmission of SARS-CoV-2</h1><br>
-Currently, the existing public health measures point to the importance of proper building and environmental engineering control measures, such as proper Indoor Air Quality (IAQ). 
+Currently, the existing public health measures point to the importance of proper building and environmental engineering control measures, such as proper Indoor Air Quality (IAQ).
 This pandemic clearly raised increased awareness on airborne transmission of respiratory viruses in indoor settings.
 Out of the main modes of viral transmission, the airborne route of SARS-CoV-2 seems to have a significant importance to the spread of COVID-19 infections world-wide, hence proper guidance to building engineers or facility managers, on how to prevent on-site transmission, is essential.<br>
 For information on the Airborne Transmission of SARS-CoV-2, feel free to check out the HSE Seminar: <a href=https://cds.cern.ch/record/2743403>https://cds.cern.ch/record/2743403</a>.<br>
@@ -12,14 +12,14 @@ Slides available in <a href=https://indico.cern.ch/event/968258>https://indico.c
 <h1>What is CARA?</h1><br>
 CARA stands for COVID Airborne Risk Assessment and was developed in the spring of 2020 to better understand and quantify the risk of long-range airborne spread of SARS-CoV-2 virus in workplaces. CARA comes with different applications that allow more or less flexibility in the input parameters:
 <ul>
-	<li><a href='/calculator'>CARA calculator app</a></li>
+	<li><a href='{{ calculator_prefix }}'>CARA calculator app</a></li>
 	<li><a href='/expert-app'>CARA expert app</a></li>
 </ul>
 
-The mathematical and physical model simulate the long-range airborne spread of SARS-CoV-2 virus in a finite volume, assuming a homogenous mixture, and estimates the risk of COVID-19 infection therein. The results DO NOT include short-range airborne exposure (where the physical distance plays a factor) nor the other known modes of SARS-CoV-2 transmission. Hence, the output from this model is only valid when the other recommended public health & safety instructions are observed, such as adequate physical distancing, good hand hygiene and other barrier measures.<br> 
-<p>The methodology, mathematical equations and parameters of the model are described here in the CERN Report: <a href="https://cds.cern.ch/record/2756083"> CERN-OPEN-2021-004</a>.</p> 
+The mathematical and physical model simulate the long-range airborne spread of SARS-CoV-2 virus in a finite volume, assuming a homogenous mixture, and estimates the risk of COVID-19 infection therein. The results DO NOT include short-range airborne exposure (where the physical distance plays a factor) nor the other known modes of SARS-CoV-2 transmission. Hence, the output from this model is only valid when the other recommended public health & safety instructions are observed, such as adequate physical distancing, good hand hygiene and other barrier measures.<br>
+<p>The methodology, mathematical equations and parameters of the model are described here in the CERN Report: <a href="https://cds.cern.ch/record/2756083"> CERN-OPEN-2021-004</a>.</p>
 
-The model used is based on scientific publications relating to airborne transmission of infectious diseases, virology, epidemiology and aerosol science. It can be used to compare the effectiveness of different airborne-related risk mitigation measures. 
+The model used is based on scientific publications relating to airborne transmission of infectious diseases, virology, epidemiology and aerosol science. It can be used to compare the effectiveness of different airborne-related risk mitigation measures.
 
 The tool helps assess the potential dose of infectious airborne viruses in indoor gatherings, with people seated, standing, moving around, while breathing, speaking or shouting/singing. The model is based on the Wells-Riley model of aerosol disease transmission, which assumes a fixed value for the average infectious dose. The dose-response models for respiratory diseases is more accurate, although since this parameter for SARS-CoV-2 is not known so far, the Wells-Riley method is recommended in the health science community (see <a href="#references_block">References</a>).
 The methodology of the model is divided into three parts:
@@ -31,7 +31,7 @@ The methodology of the model is divided into three parts:
 Parts #1 and #3 are mainly based on methods published in scientific papers (see <a href="#references_block">References</a>), and cover the medical aspects, which is not the core competencies of the authors. The ‘heart and soul’ of CARA lies within the Part #2 and the concentration modelling, which is based on a mass-balance differential equation solved for a constant emission rate and time-dependent exchange rate (e.g. natural ventilation flow rate). Other aspects, e.g., the biological decay of the virus in the air, gravitational settlement of the aerosols, mechanical supply of fresh air, effect of HEPA filtration, among others, are also included.<br>
 
 <h1>What is the aim of CARA?</h1><br>
-Although the user is able to calculate the infection probability of a stand-alone event with a pre-defined set of protection measures, the main utility of CARA is to compare the relative impact of different measures and/or combination of measure. For example: 
+Although the user is able to calculate the infection probability of a stand-alone event with a pre-defined set of protection measures, the main utility of CARA is to compare the relative impact of different measures and/or combination of measure. For example:
 <ul>
 	<li>Compare keeping a window slightly open vs one or two windows open entirely</li>
 	<li>Compare opening one entire window every 2h for 10 min vs keeping half a window open all day</li>
diff --git a/cara/apps/templates/index.html.j2 b/cara/apps/templates/index.html.j2
index b75b529d..390ed990 100644
--- a/cara/apps/templates/index.html.j2
+++ b/cara/apps/templates/index.html.j2
@@ -35,7 +35,7 @@
                 <div class="text-component-text cern_full_html" >
                   <p>
                   CARA has been developed by CERN with the intention of allowing members of personnel with roles related to supervision, health & safety or space management to simulate the concerned workplaces on CERN sites.
-                  A hosted <a href="/calculator">CERN version of the CARA Covid Calculator</a> is available on this site to members of the CERN personnel.
+                  A hosted <a href="{{ calculator_prefix }}">CERN version of the CARA Covid Calculator</a> is available on this site to members of the CERN personnel.
                   </p>
                 </div>
 
diff --git a/cara/apps/templates/layout.html.j2 b/cara/apps/templates/layout.html.j2
index a5fe95ea..6d304e15 100644
--- a/cara/apps/templates/layout.html.j2
+++ b/cara/apps/templates/layout.html.j2
@@ -128,18 +128,18 @@
                       </li>
 
                       <li class="dropdown">
-                        <a href="/calculator" class="dropdown-toggle {{ "is-active" if "calculator/" in active_page else "" }}">
+                        <a href="{{ calculator_prefix }}" class="dropdown-toggle {{ "is-active" if "calculator" in active_page else "" }}">
                             COVID Calculator
                             <span class="caret"></span>
                         </a>
                         <ul class="dropdown-menu">
                           <li>
-                            <a href="/calculator" class="{{ "is-active" if "calculator/" == active_page else "" }}">
+                            <a href="{{ calculator_prefix }}" class="{{ "is-active" if "calculator" == active_page else "" }}">
                                 Calculator
                             </a>
                           </li>
                           <li>
-                            <a href="/calculator/user-guide" class="{{ "is-active" if "calculator/user-guide" == active_page else "" }}">
+                            <a href="{{ calculator_prefix }}/user-guide" class="{{ "is-active" if "user-guide" in active_page else "" }}">
                                 User guide
                             </a>
                           </li>
diff --git a/cara/tests/apps/calculator/test_webapp.py b/cara/tests/apps/calculator/test_webapp.py
index 0a22fe59..49f3b065 100644
--- a/cara/tests/apps/calculator/test_webapp.py
+++ b/cara/tests/apps/calculator/test_webapp.py
@@ -66,27 +66,40 @@ class TestCernApp(tornado.testing.AsyncHTTPTestCase):
         assert 'CERN HSE' in response.body.decode()
         assert 'expected number of new cases is' in response.body.decode()
 
+class TestOpenApp(tornado.testing.AsyncHTTPTestCase):
+    def get_app(self):
+        return cara.apps.calculator.make_app(calculator_prefix="/mycalc")
+
+    @tornado.testing.gen_test(timeout=_TIMEOUT)
+    def test_report(self):
+        response = yield self.http_client.fetch(self.get_url('/mycalc/baseline-model/result'))
+        self.assertEqual(response.code, 200)
+
+    def test_calculator_404(self):
+        response = self.fetch('/calculator')
+        assert response.code == 404
+
 
 async def test_qrcode_urls(http_server_client, baseline_form):
-    prefix = 'proto://hostname/prefix'
-    qr_data = generate_qr_code(prefix, baseline_form)
-    expected = f'{prefix}/calculator?exposed_coffee_break_option={baseline_form.exposed_coffee_break_option}&'
+    base_url = 'proto://hostname/prefix'
+    qr_data = generate_qr_code(base_url, "/calculator", baseline_form)
+    expected = f'{base_url}/calculator?exposed_coffee_break_option={baseline_form.exposed_coffee_break_option}&'
     assert qr_data['link'].startswith(expected)
 
     # We should get a 200 for the link.
-    response = await http_server_client.fetch(qr_data['link'].replace(prefix, ''))
+    response = await http_server_client.fetch(qr_data['link'].replace(base_url, ''))
     assert response.code == 200
 
     # And a 302 for the QR url itself. The redirected URL should be the same as
     # in the link.
-    assert qr_data['qr_url'].startswith(prefix)
+    assert qr_data['qr_url'].startswith(base_url)
     response = await http_server_client.fetch(
-        qr_data['qr_url'].replace(prefix, ''),
+        qr_data['qr_url'].replace(base_url, ''),
         max_redirects=0,
         raise_error=False,
     )
     assert response.code == 302
-    assert response.headers['Location'] == qr_data['link'].replace(prefix, '')
+    assert response.headers['Location'] == qr_data['link'].replace(base_url, '')
 
 
 async def test_invalid_compressed_url(http_server_client, baseline_form):