--- title: "Migration to Expo" description: "Move your React Native app to Expo and EAS for faster builds, simpler releases, and full access to the modern ecosystem." url: https://www.callstack.com/services/migration-to-expo updated: 2026-11-09T15:59:20.337Z --- # Migration to Expo Move your React Native app to Expo and EAS for faster builds, simpler releases, and full access to the modern ecosystem. _[Expert Engineering](/ai-native-engineering) › [Migrations & Upgrades](/capabilities/ai-assisted-migrations)_ **Move to Expo without losing native capability** Bare React Native carries tooling weight most teams no longer need. We migrate apps to Expo's managed workflow and EAS - keeping custom native code working through config plugins - and hand back a delivery flow your team enjoys. ## Migrations & Upgrades - React Foundation Founding Member · 300+ commits to React Native · Contributing since 2016 - Industry runs on our tooling · 50M+ OSS downloads / month - 4x More React Native pages · 30% React Native adoption - 60 → 10min Faster builds after replacing Jenkins with EAS - React Native Brownfield · Tooling for introducing React Native into existing native apps incrementally. - 100+ Enterprise projects delivered ## What you get: Simpler builds, same product. - **Migration assessment** Every native customization audited and mapped to a config plugin, prebuild step, or replacement. - **Config plugin engineering** Custom native code preserved through plugins instead of manual pod and gradle edits. - **EAS pipeline setup** Builds, signing, and store submission automated end to end. - **OTA update strategy** expo-updates configured with channels, staged rollouts, and rollbacks. - **CI simplification** Legacy pipeline complexity replaced with a faster, smaller setup. - **Team enablement** Your engineers leave fluent in the Expo workflow, not dependent on us. ## How we work together: Move from migration plan to rollout. ### Extend your team (1 week) Our senior engineers join your team to ship features, guide technical decisions, and strengthen delivery. - Your roadmap and workflow - Expertise shared as we work - Flexible timezone coverage ### Deliver a project (1-12 months) We take agreed work from technical planning to release, with clear responsibilities and progress you can see. - 3 Callstack engineers ship like 6 - Impact visible before sprint two - End-to-end delivery ### Solve specific challenge (as needed) We address a performance, migration, or infrastructure challenge, or run training around your team’s needs. - Focused reviews or implementation - Knowledge your team keeps - Outcomes guaranteed with contract ## What shipping at AI speed looks like. - [Modernizing a Crypto Trading Platform With React Native and Self-Hosted OTA](/case-studies/modernizing-mobile-apps-in-production-with-react-native-and-self-hosted-ota): 4x increase in RN pages across the tracked page set - [Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture](/case-studies/migrating-questrade-edge-mobile-to-a-faster-more-scalable-architecture): 33% fewer re-renders across most features - [Migrating a Legacy React Native App to Expo for Faster Builds and Simplified Releases](/case-studies/migrating-a-legacy-react-native-app-to-expo-for-faster-builds-and-simplified-releases): 6x faster builds after replacing Jenkins with EAS - [Training HelloFresh Engineers to Build Production Apps With React Native](/case-studies/training-hellofresh-engineers-to-build-production-apps-with-react-native): 2.8x increase in knowledge over 8 weeks (25% → 71% assessment scores) **Builds in minutes, releases without ceremony.** We move the app to Expo and prove the speed difference in your own pipeline. [Get my migration plan](/contact) > We had been struggling with React Native application performance until we met Callstack. > > — Huỳnh Chí Hùng, Associate Director, MOMO We’ll connect you with the right expert within 24 hours. ## Let’s find the right path for your product. **Will our custom native modules survive?** Almost always. Config plugins and prebuild cover the vast majority of native customizations; the assessment flags the rare exceptions before work starts. **What if a library is incompatible?** We replace it with a maintained equivalent, wrap it in a config plugin, or contribute the fix upstream - in that order of preference. **EAS cloud or self-hosted builds?** Both work. EAS is the fast default; self-hosted fits cost and compliance constraints. We model the economics for your release volume. **How risky is the migration?** Low, run properly: the old pipeline keeps shipping until the Expo one is proven in parallel. No big-bang cutover. **How long does it take?** Small apps in days with agent-assisted execution; complex native setups in weeks. The assessment gives you a real number. **What does this do to build times?** Teams typically see dramatically faster builds versus legacy CI - one client cut build times 6x after replacing Jenkins with EAS. ## Open source - [React Native Brownfield](https://github.com/callstack/react-native-brownfield): Incrementally move your iOS and Android apps to React Native without breaking - [Agent Skills](https://github.com/callstackincubator/agent-skills): Callstack’s best practices on React Native performance optimization, upgrading, CI workflows, and brownfield migrations - [React Native Community CLI](https://github.com/react-native-community/cli): Command line tools to help you build React Native apps - [React Native Builder Bob](https://github.com/callstack/react-native-builder-bob): Simple set of CLIs to scaffold and build React Native libraries for different targets - [Rock](https://www.rockjs.dev/): Modular toolkit for teams building React Native apps