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Expo OTA updates can deliver compatible JavaScript and asset changes to an installed app without waiting for a new store release—but they do not replace the native app binary or bypass Apple and Google Play rules. The practical boundary is whether the change fits the native code already installed, can be safely delivered to that build, and complies with the platform’s policies.
What an OTA update changes—and what it cannot
Expo’s EAS Update delivers app updates such as JavaScript, styling, and images to an app that already includes and configures expo-updates. That library must be included in an Android or iOS build, so an app that was not built to receive updates cannot start accepting them merely because a developer publishes one. Expo supports Continuous Native Generation projects and existing React Native projects with the library installed; the latter require integration work. See Expo’s EAS Update introduction and setup guide.
Expo identifies JavaScript bug fixes, copy and translation changes, styling, layouts, internal testing, and percentage rollouts as OTA use cases. A new native build is required for native code or dependency changes, permission changes, an Expo SDK upgrade, and other changes that need a new binary. These are Expo’s technical guidelines, not a guarantee that every JavaScript change is allowed by an app store. A change can be technically compatible and still cross a platform policy boundary.
Use a new binary when the installed native app must change
If the change depends on native code, a native dependency, a permission, or a new SDK version, build and distribute a new app version through the relevant store. OTA is not a way to add a native capability to a binary that does not contain it.
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Use OTA only for compatible, policy-compliant changes
For changes confined to JavaScript and assets, first confirm that the target build can run them and that the resulting behavior complies with the store rules. “Small” is not itself a compatibility or policy test: a modest JavaScript edit can still materially change app functionality.
How a published update reaches a user
Publishing makes an update available; it does not instantly change every running installation. The client checks for and downloads an update according to the app’s configuration, then applies it on a later launch or reload, depending on that configuration. Expo’s update API includes methods for checking and fetching updates, and the EAS Update dashboard provides update information. The distinction matters when assessing how quickly a fix will reach users: publication, download, and activation are separate stages.
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- Configure the app: follow Expo’s EAS Update setup instructions, which use
eas update:configure, and create an Android or iOS build that includesexpo-updates. - Prepare and test the change: check that it runs against the native code in the intended installed build, and test it on an appropriate preview or internal stream before broad release.
- Confirm the target: verify the update channel and runtime version. Channels select update streams; runtime versions restrict updates to compatible native builds.
- Publish: use the EAS Update publishing workflow for the intended channel. The update contains the applicable JavaScript bundle and assets; only clients configured for that stream and compatible with the update can use it.
- Observe adoption and errors: distinguish a successful publication from devices that have actually downloaded and activated the update. Use the available update information to monitor the rollout.
- Keep a recovery option: know which published update or embedded build you would return users to before widening exposure.
Expo documents internal testing and percentage rollouts, which can help teams stage exposure rather than send a change to all eligible users at once. Neither staging nor publication removes the need to monitor the update’s behavior.
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A runtime version is the compatibility gate between a built app’s native code and the JavaScript update it can run. Expo documents policies based on app version, native version, and a fingerprint that hashes project inputs. Choose a policy that tracks the native changes your project makes; do not treat a changed native codebase as compatible simply because its JavaScript bundle still publishes. Details and policy options are in Expo’s runtime version documentation.
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Channels and runtime versions answer different questions. A channel identifies which update stream a build follows—for example, preview or production. The runtime version determines whether the build is compatible with an update. Keeping these roles distinct helps prevent a preview release from reaching the wrong audience and a JavaScript update from being served to a build with incompatible native code.
Choose an OTA release pattern that fits your team
Expo describes several deployment patterns rather than prescribing one universal cadence. Compare them by urgency, the installed versions you need to cover, compatibility confidence, and your readiness to monitor and roll back. The client’s configuration and launch behavior still determine when a published update is fetched and activated.
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| Pattern | When it fits | Compatibility and audience | Main operational consideration |
|---|---|---|---|
| Hotfixes only | Normal changes ship in store builds; OTA is reserved for urgent, compatible fixes. | Target only installed builds whose native runtime supports the fix. | Be ready to monitor the urgent release and revert if needed. |
| Between-binary releases | Use OTA for appropriate JavaScript changes between planned store builds. | Confirm the target channel and runtime for the installed app versions in scope. | Maintain a clear boundary between changes that fit the current binary and those that require the next one. |
| Cross-runtime deployment | A change is intended to reach more than one compatible generation of installed app. | Each targeted runtime must be supported by the change and receive the appropriate update. | Compatibility review is especially important; do not assume one bundle is safe for every installed generation. |
These are patterns Expo has observed, not a universal recommendation about how often to release. Pick the one that matches your release cadence and the versions your users actually have installed.
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Understand the Apple and Google Play boundaries
OTA capability is not an app-store policy exemption. Apple’s current App Review Guidelines, section 2.5.2, say apps should be self-contained and generally restrict downloading, installing, or executing code that introduces or changes app features or functionality. The guideline includes a limited exception for educational apps designed to teach, develop, or let students test executable code, subject to its conditions. Do not treat that exception as a general allowance for remotely changing an app.
Google Play’s current Device and Network Abuse policy prohibits a Play-distributed app from modifying, replacing, or updating itself outside Google Play and restricts downloading native executable files such as dex, JAR, or .so files from outside Play. It states an exception for code running in a virtual machine or interpreter, while requiring that runtime-loaded interpreted languages not allow potential policy violations. In Google Play’s words: “Apps or third-party code, like SDKs, with interpreted languages (JavaScript, Python, Lua, etc.) loaded at run time (for example, not packaged with the app) must not allow potential violations of Google Play policies.”
Expo likewise says users of EAS Update must follow the rules of the platforms and app stores they build for. Platform review is case-specific, and policy text can change, so consult the current platform rules for the app and behavior you intend to ship rather than treating an OTA implementation as approval. Expo’s FAQ reproduces policy excerpts dated April 25, 2024; for current wording, use Apple’s and Google Play’s policy pages above.
Plan rollback before you need it
EAS Update documents two rollback targets: a previously published update or the update embedded in the installed build. Rolling back to a prior publication republishes that update; rolling back to the embedded update instructs clients to run the version built into the app. After a rollback, a later publication can deliver a new update again. These actions do not make every device change immediately: clients still need to fetch and apply the relevant update under their configured runtime behavior. See Expo’s rollback guide.
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Expo’s engineering guidance dated April 14, 2026 recommends keeping JavaScript bundles and assets lean, reviewing bundle composition, and submitting store builds regularly. Regular builds can keep the binary’s included assets current, leaving less new asset data for subsequent OTA publications to carry. These are recommendations, not a measured guarantee of download size, delivery speed, or time saved. The practical benefit of OTA is avoiding a store release for changes that fit the installed binary—not a quantified promise that every fix will reach users faster.
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