Sentry vs Crashlytics: Best Flutter Crash Reporting (2026)

If you ship an app without crash reporting, you find out about crashes from one-star reviews. By then it is too late. Crash reporting is the first integration to add after auth, and it is one of the first signals a store uses to judge stability. For a Flutter app, the two realistic choices are Sentry and Firebase Crashlytics. They overlap, but they are not the same.

What each one is

Firebase Crashlytics is Google's crash reporter, built into Firebase. It captures crashes and application-not-responding (ANR) events, groups them by real-user impact, and provides custom logs, breadcrumbs, and custom keys for crash context. It also offers AI crash insights using Gemini to help identify root causes faster, and release monitoring to track new-release adoption and stability in real time (Firebase).

Sentry is an independent error-monitoring platform with a dedicated Flutter SDK. It captures errors with stack traces, performance tracing, session replays, and logs. The Flutter SDK is added via the Sentry Wizard, which updates pubspec.yaml with the sentry_flutter and sentry_dart_plugin packages, and is initialized with SentryFlutter.init wrapping the app (Sentry Docs).

What they capture

• Crashes: both capture native and Dart crashes out of the box.
• ANRs: Crashlytics captures application-not-responding events (Firebase).
• Performance: Sentry collects performance profiles and tracing from real users; Crashlytics focuses on stability, not performance profiling.
• Session replays: Sentry includes session replay for errors; Crashlytics does not.
• Breadcrumbs and custom logs: both support custom logging and breadcrumbs for crash context.
• Release health: both track release adoption and stability. Crashlytics does it in real time; Sentry exposes it through release health features.

Free tier and pricing

Crashlytics is free. There is no cost to using it (Firebase). You pay only if you use other Firebase features that are billed.

Sentry's Developer tier is free with 5,000 errors per month, 50 session replays, a 30-day lookback, and a single user seat (Sentry). Paid tiers raise event volume and add team seats.

For a solo AI-app founder at launch volume, either free tier is enough. The difference is the ceiling and the ecosystem, not the price.

Setup and integration

Crashlytics is part of Firebase, so it is the simpler choice if you already use Firebase Auth, Firestore, or Analytics. It is bundled with the Firebase Flutter plugin and configured through firebase configure. The trade-off is that it comes with Firebase's larger native library footprint.

Sentry is lighter to integrate and is not bundled with a larger platform. The Sentry Wizard handles Flutter setup: it installs the SDK, adds the Dart plugin for symbolication, and wires SentryFlutter.init into your app entrypoint. If your app is not already on Firebase, Sentry avoids pulling in the full Firebase stack (Sentry Docs).

How to choose

The decision usually comes down to one question: are you already on Firebase?

• Already using Firebase (auth, Firestore, Analytics): add Crashlytics. It is free, native to your stack, and you avoid a second platform. You give up session replays and richer performance tracing.
• Not on Firebase, or want a standalone tool: use Sentry. It is lighter, captures performance and replays, and the Developer free tier covers launch volume. You give up the AI crash insights and the Firebase integration.
• Need both: it is possible to run both, but for a solo founder this is overhead. Pick one at launch; you can add the other if a specific need appears.

What to set up before launch

Whichever you pick, configure it before your first test build, not after:

1. Initialize the SDK before the first frame, so crashes during startup are captured.
2. Upload debug symbols so stack traces are readable, not obfuscated. For Sentry, the sentry_dart_plugin handles this; for Crashlytics, configure symbol upload in your build.
3. Set release and version tags so crashes map to a specific build.
4. Add a breadcrumb for key user actions (sign-in, checkout, scan) so crash context shows what happened before the failure.
5. Verify a test crash appears in the dashboard before you ship.

An app that ships without symbolicated stack traces ships blind. A crash report that says "obfuscated error in unknown file" is useless at 2 a.m.

The bottom line

For most Flutter apps at launch, Crashlytics is the default if you are already on Firebase, and Sentry is the default if you are not. Both are free at launch volume. The choice matters less than the discipline of installing it before launch, uploading symbols, and verifying a test crash lands in the dashboard.

Run the ShipForge Launch Score to check whether crash reporting, auth, and store-readiness are wired before you submit.

Frequently asked questions

Sources

• Firebase — Crashlytics
• Sentry Docs — Sentry for Flutter
• Sentry — Pricing

Frequently asked questions

Should I use Sentry or Firebase Crashlytics for Flutter?

Both are excellent for Flutter crash reporting. Sentry offers better error grouping, release tracking, and performance monitoring but costs more at scale. Firebase Crashlytics is free, integrates with the Google ecosystem, and is simpler to set up. Choose Sentry if you need advanced features, Crashlytics for free simplicity.

How do I initialize crash reporting before runApp in Flutter?

For Sentry, wrap your runApp call: await SentryFlutter.init((options) {...}, appRunner: () => runApp(MyApp()). For Crashlytics, add FirebaseCrashlytics.instance.setCrashlyticsCollectionEnabled(true) in main() before runApp. This ensures crashes during startup are captured.

Will my app get rejected if crash reporting is not initialized?

Apple will not reject your app simply for not initializing crash reporting, but unreported crashes in production are a serious quality issue. The most common "looks done, isn't" finding in launch audits is a crash SDK installed in pubspec.yaml but never initialized before runApp.