Startup performance metrics
Track cold launch, warm launch, bundle load, first render, and time to interactive across real device sessions, with P50, P90, and P99 views for each metric.
EAS Observe
EAS Observe monitors production performance in Expo and React Native apps, showing startup metrics, session timelines, release markers, and errors in the Expo dashboard.
Overview
EAS Observe is a mobile performance monitoring service for Expo and React Native apps. It surfaces production metrics directly in the Expo dashboard and links those metrics back to the build or OTA update that introduced them.
The product is positioned for teams that want to understand real user experience on device, not just aggregate app health. It combines startup timing data, session timelines, release markers, and error traces so developers can investigate performance changes, route-level slowdowns, and crashes in one place.
Core capabilities
Session timelines with custom events
Follow one session through navigation, performance, and custom events so you can reconstruct what happened before a user converted, dropped off, or hit a failure.
Build and release comparison
Tie every build and OTA update to performance data, then compare a release against the version before it to see what changed after shipping.
Error reporting with source context
See JavaScript errors with a stack trace that points to the file and line, rather than only a minified bundle location.
Route-level performance views
Break time to interactive down by route through Expo Router integration, helping you identify slow screens instead of relying on app-wide averages.
Dashboard and agent access
Inspect metrics, routes, events, and sessions from the CLI, and let an agent receive the same context directly from Observe.
Common use cases
Monitor startup performance in production
Use Observe to watch cold and warm launches, bundle load, first render, and time to interactive on real devices, then inspect the distribution across your user base.
Analyze release impact
Use build and update markers to determine whether a slowdown, error spike, or changed user journey appeared after a specific release or OTA update.
Debug slow screens and drop-offs
Use route-level performance views and session timelines to find which screen or step is slow, then compare routes across builds or updates.
Instrument user journeys with events
Use custom events and timeline views to trace checkout, onboarding, sync, or similar flows and see what happened before a user converted or failed.
Share context with humans or agents
Use CLI access or an agent workflow to pull metrics, routes, events, and sessions when you want the same context without manual dashboard copying.
Pros and Cons
Pros
- Ties performance metrics to the build or update that introduced them, which helps connect regressions to releases.
- Includes startup metrics, session timelines, route-level views, and error traces in the same product.
- Supports custom event logging with Observe.logEvent for annotating real user journeys.
- Offers CLI access so metrics and sessions can be queried outside the dashboard.
- Available on the Free plan with a stated 100,000 events per month, with higher event limits on paid tiers.
Cons
- Bare React Native CLI support is not yet available; the page says it is on the roadmap.
- The landing page does not provide a full feature-by-feature setup guide or detailed integration requirements.
- The FAQ states sampling is supported, which means not every installation necessarily reports data.
FAQ
Does EAS Observe work with React Native CLI apps?
Observe is built for Expo apps. The page says that if you’re on Expo SDK 55 or later and using EAS, you’re set; bare React Native support is described as being on the roadmap.
Is there sampling in Observe?
Yes. The page says you can set a sampleRate between 0 and 1 in configure(), and that changing sampling or dispatching settings requires a release or an EAS Update.
What data does Observe collect?
Observe collects performance timing data, device model, OS version, app version, and an anonymous install-scoped ID. The page says it does not collect personally identifiable information.
How do you set up Observe?
The landing page says one install can start reporting real sessions in minutes after installing expo-observe. It also says five startup metrics begin reporting from real sessions, with router integration adding per-screen timings.
Which EAS plans include Observe?
The pricing page shows Observe is included in all listed EAS plans, including Free, Starter, Production, and Enterprise, with included events varying by plan.
Quick Facts
- Category
- Mobile performance monitoring
- Platform
- Expo and React Native
- Product family
- EAS
- Primary use
- Track production app performance and release impact
- Pricing model
- Free tier plus paid EAS plans
- Website
- expo.dev
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