What should I use for split testing a mobile app?

For split testing a mobile app, the best choice depends on what you want to test:

If you want to test product/UI changes inside the app

Use an A/B testing + feature flag tool such as:

• Firebase A/B Testing — good if you’re already using Firebase/Google Analytics
• Optimizely — strong experimentation platform
• Split.io — good for feature flags + experiments
• LaunchDarkly — great for feature flags, can also support experiments
• Amplitude Experiment — useful if you already use Amplitude analytics

If you want to test app store page conversion

Use:

• Google Play Store experiments for Android
• Apple Product Page Optimization for iOS

If you want to test onboarding, paywalls, or retention flows

Look for tools that support:

• feature flags
• remote config
• event tracking
• experiment statistics
• user segmentation

A common setup is:

• Firebase Remote Config + Firebase A/B Testing for simple experiments
• Amplitude/Optimizely/Split.io for more advanced testing

What I’d recommend

• Small team / simple needs: Firebase A/B Testing
• Growth team / serious experimentation: Optimizely or Split.io
• If feature flags are the main need: LaunchDarkly

If you want, I can recommend the best tool based on your stack:

• iOS / Android / both
• Firebase or not
• budget
• whether you need feature flags, paywall tests, or UI experiments