Expo Observe is an observability library for monitoring your app's performance in production. It helps you understand how your app performs for real users across different devices, networks, and conditions.

Overview

Debugging performance in React Native has traditionally been limited to development-time tools. Expo Observe focuses on tracking performance in production, giving you visibility into how your app actually performs for users.

In this initial release, Expo Observe focuses on startup metrics:

• Cold Launch Time: launch time when the app's native code and resources are not in memory
• Warm Launch Time: launch time when native libraries, app's state and resources are already cached in memory
• Time to First Render: when content first appears on screen
• Time to Interactive: when your app is ready for user input
• Bundle Load Time: how long it takes to load your JavaScript

Requirements

• Expo SDK 55 or later
• An EAS project (ensure extra.eas.projectId in app config includes the project ID, or create one with eas build:configure)

Installation

1. Ensure you are using the latest version of expo:

npx expo install --fix

1. Install the library:

npx expo install expo-eas-observe

1. If you're using Bun or Yarn v1, also install expo-eas-client (not required for other package managers since pnpm, npm and yarn classic will install peer dependencies automatically)