EAS Observe

Overview

Observe centers on how quickly an app starts, renders, becomes interactive, loads its bundle, and receives an EAS Update. Those measurements can be compared between app versions and over-the-air updates, making it useful when a team needs to connect a slowdown with a particular release. Data is collected from production use across real devices and conditions, with device model, operating-system version, app version, and an anonymous install-scoped ID; Expo says personally identifiable information is not collected.

Setup has meaningful boundaries. The app must use Expo SDK 55 or later and be linked to an EAS project, and it must run in a development or production build because Observe is not available in Expo Go. That makes it a natural fit for an Expo-centered release process, not a general-purpose monitor for arbitrary mobile projects.

Key features

Startup instrumentation covers cold and warm launch time, time to first render, time to interactive, bundle load time, and EAS Update download time. Comparing those values across releases gives teams a concrete way to find regressions instead of judging performance by anecdotal reports.

Expo Router and React Navigation integrations add render and interactive timings for individual routes. This extends the view from “the app is slow” to which screen is taking too long. Custom events logged with Observe.logEvent can be analyzed alongside the timing data, so teams can relate performance to user-defined milestones or flows.

Results appear in the EAS dashboard and can also be queried from the terminal through EAS CLI commands. Network request tracing and app performance monitoring are supported. JavaScript error and native crash reporting are described as preview features, so Observe should not be treated as a finished replacement for a dedicated crash-monitoring system. It also has no ANR monitoring and no session replay.

Pricing

Every EAS plan retains data for 90 days. Paid tiers include 500,000 events per month, then charge for additional usage; the free tier stops at 100,000 events per month.

Free is a sensible way to instrument a smaller app, but its 100K-event ceiling can become restrictive as usage grows. Starter is the entry point for teams needing the larger allowance at $19 per month, though overage costs mean the headline price is not a complete spending ceiling. Production costs $199 per month with the same included event volume, so it is aimed at organizations that need that commercial tier rather than simply more included events. Enterprise is for buyers who require a negotiated arrangement; its price is custom.

Platforms

Observe is presented for Android, iOS, and web, while its supported-platform documentation also includes tvOS. Dashboard and CLI metrics can be filtered by platform. The SDK-55-and-EAS-project requirements apply regardless of platform, and Expo Go remains excluded.

Who it's for

Choose EAS Observe if your team ships Expo apps, uses EAS builds or updates, and needs to compare startup or route performance between releases. It is particularly appropriate when OTA updates make regression attribution important, or when route-level timing and custom business events matter more than replay footage.

Look elsewhere if you need established crash and error coverage, ANR detection, session replay, or monitoring for apps outside the Expo/EAS workflow. The preview status of crash reporting and the absence of replay leave those jobs to complementary tools.

Pros and cons

Pros

• Release and OTA comparisons make performance regressions easier to associate with a specific change.
• Startup, route, and custom-event timings cover both app-wide and user-flow performance questions.
• Dashboard and EAS CLI access suits teams that work from either visual reports or terminal workflows.
• Expo says data is encrypted in transit and at rest, with SOC 2 Type 2 attestation.

Cons

• SDK 55+, an EAS project, and a development or production build exclude older projects and Expo Go users.
• JavaScript error and native crash reporting are preview features, not a mature error-monitoring foundation.
• No ANR monitoring or session replay means limited help with hangs and visual reproduction.
• Starter and higher plans add usage-based charges after 500K events, so monthly cost can rise with volume.

Alternatives

For a broader catalog of monitoring choices, see Mobile App Monitoring.

BugSnag is the better direction when you want freemium monitoring spanning many platforms and a free trial, with a free tier measured in events and spans.

Guance Container Monitoring fits teams focused on hosts, metrics, and logs rather than Expo release timing, with a free plan built around infrastructure quotas.

Middleware is worth choosing when browser, RUM, synthetic checks, and broader observability coverage are more important than Expo-specific timings.

Appelium is an alternative for teams wanting iOS, tvOS, and Android coverage with app-based plans.

Bugfender suits log-centric mobile diagnostics, offering a free allowance based on daily log lines and device count.

Firebase Cloud Messaging is a no-cost messaging service, not a substitute for Observe's performance measurement.

OpenReplay is the stronger choice when open-source, self-managed session replay and retention control are priorities.

Rejourney fits teams primarily seeking session replays and funnel or cohort analysis.

Verdict

Choose EAS Observe for an Expo team that needs production timing data tied to app versions, OTA updates, routes, and custom events. Its focused instrumentation and EAS workflow are the main reasons to choose it. Look elsewhere when crash maturity, ANR monitoring, session replay, or a non-Expo platform is the central requirement.