TestFlight vs Firebase App Distribution

In this guide

Comparison
Which fits when
What neither gives you

Both tools get a pre-release build to testers. They are tools for sending builds, not sources of testers: you still need people. Facts below come from the official pages listed at the end (retrieved 2026-10-23). Features change, so re-check before you decide.

Comparison

	TestFlight	Firebase App Distribution
Platforms	"Across Apple platforms"	iOS and Android, managed "from the same place"
Internal testers	Up to 100 team members with certain roles	Page states no tester limit
External testers	Up to 10,000	Page states no tester limit
Testers' devices	Up to 30 devices per tester	Not stated on the page
Review step	First build must be approved by App Review for external testing	Not mentioned on the page
Uploads	Builds shared through the Apple developer tools	APK, AAB or IPA via console, fastlane, Gradle or Firebase CLI
Tester onboarding	Invitation to the beta	Email invitation; no SDK needed per the page
Cost	Not stated on the page; check Apple's current terms	Not stated on the page; see its pricing page

Which fits when

iOS-only app: TestFlight is Apple's own route for external beta builds.
Android-only app: Firebase App Distribution is one option; Google Play also has its own test tracks (see closed test vs staged rollout vs soft launch).
Both platforms and one place to manage them: Firebase App Distribution lists both iOS and Android; you may still use TestFlight for iOS.
Large external beta on iOS: check the TestFlight limits and review requirement above.

What neither gives you

Neither finds testers or structures their feedback. AppReviewX does not distribute builds or installers either: you add your app, and other developers give private, structured feedback in test rounds. 1 accepted feedback = 1 credit; new accounts start with 0. For Android apps there are test groups for the Google Play closed test (12 testers, 14 days in a row), and test packages for apps that are already published.

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