Flutter experiments installation

Install the package

Required

Add the PostHog Flutter SDK to your pubspec.yaml:

pubspec.yaml
posthog_flutter: ^5.0.0

Android setup

Required

Add these values to your AndroidManifest.xml:

android/app/src/main/AndroidManifest.xml
<application>
    <activity>
        [...]
    </activity>
    <meta-data android:name="com.posthog.posthog.API_KEY" android:value="<ph_project_api_key>" />
    <meta-data android:name="com.posthog.posthog.POSTHOG_HOST" android:value="https://us.i.posthog.com" />
    <meta-data android:name="com.posthog.posthog.TRACK_APPLICATION_LIFECYCLE_EVENTS" android:value="true" />
    <meta-data android:name="com.posthog.posthog.DEBUG" android:value="true" />
</application>

Update the minimum Android SDK version to 21 in android/app/build.gradle:

android/app/build.gradle
defaultConfig {
    minSdkVersion 21
    // rest of your config
}

iOS/macOS setup

Required

Add these values to your Info.plist:

ios/Runner/Info.plist
<dict>
    [...]
    <key>com.posthog.posthog.API_KEY</key>
    <string><ph_project_api_key></string>
    <key>com.posthog.posthog.POSTHOG_HOST</key>
    <string>https://us.i.posthog.com</string>
    <key>com.posthog.posthog.CAPTURE_APPLICATION_LIFECYCLE_EVENTS</key>
    <true/>
    <key>com.posthog.posthog.DEBUG</key>
    <true/>
</dict>

Update the minimum platform version to iOS 13.0 in your Podfile:

Podfile
platform :ios, '13.0'
# rest of your config

Web setup

Add these values in index.html:

web/index.html
<!DOCTYPE html>
<html>
    <head>
        ...
        <script>
            !function(t,e){var o,n,p,r;e.__SV||(window.posthog=e,e._i=[],e.init=function(i,s,a){function g(t,e){var o=e.split(".");2==o.length&&(t=t[o[0]],e=o[1]),t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}}(p=t.createElement("script")).type="text/javascript",p.async=!0,p.src=s.api_host.replace(".i.posthog.com","-assets.i.posthog.com")+"/static/array.js",(r=t.getElementsByTagName("script")[0]).parentNode.insertBefore(p,r);var u=e;for(void 0!==a?u=e[a]=[]:a="posthog",u.people=u.people||[],u.toString=function(t){var e="posthog";return"posthog"!==a&&(e+="."+a),t||(e+=" (stub)"),e},u.people.toString=function(){return u.toString(1)+".people (stub)"},o="init capture register register_once register_for_session unregister opt_out_capturing has_opted_out_capturing opt_in_capturing reset isFeatureEnabled getFeatureFlag getFeatureFlagPayload reloadFeatureFlags group identify setPersonProperties setPersonPropertiesForFlags resetPersonPropertiesForFlags setGroupPropertiesForFlags resetGroupPropertiesForFlags resetGroups onFeatureFlags addFeatureFlagsHandler onSessionId getSurveys getActiveMatchingSurveys renderSurvey canRenderSurvey getNextSurveyStep".split(" "),n=0;n<o.length;n++)g(u,o[n]);e._i.push([i,s,a])},e.__SV=1)}(document,window.posthog||[]);
            posthog.init('<ph_project_api_key>', {
                api_host: 'https://us.i.posthog.com',
                defaults: '2025-11-30',
            })
        </script>
    </head>
    <body>
        ...
    </body>
</html>

Implement your experiment

Required

Experiments run on top of our feature flags. You can define which version of your code runs based on the return value of the feature flag:

if (await Posthog().getFeatureFlag('your-experiment-feature-flag') == 'test') {
    // Do something differently for this user
} else {
    // It's a good idea to let control variant always be the default behaviour,
    // so if something goes wrong with flag evaluation, you don't break your app.
}

6
Run your experiment
Required
Once you've implemented the feature flag in your code, you'll enable it for a target audience by creating a new experiment in the PostHog dashboard.

Next steps

Recommended

Resource	Description
Creating an experiment	How to create an experiment in PostHog
Adding experiment code	How to implement experiments for all platforms
Statistical significance	Understanding when results are meaningful
Experiment insights	How to analyze your experiment data
More tutorials	Other real-world examples and use cases

Flutter experiments installation

Install the package

Android setup

iOS/macOS setup

Web setup

Implement your experiment

Run your experiment

Next steps

Community questions

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