Codemagic Patch OTA updates for React Native

Patch is an over-the-air update service for React Native apps that lets you ship updates to your end users within minutes.

1. Updates are delivered over the air instead of waiting for store review so they can land in minutes after deployment similar to how it works for web apps.
2. Patch has optimised the packaging of bundles by using calculating the binary level diff for the update. This allows to keep the update small.
3. Updates are served on CDN edge instead of previous Codepush approach where client would request update from the server. This is a unique approach we took and will make serving updates at scale and in poorly connected areas much more reliable.

Limitations:

1. You're only able to patch javascript code and assets. If you need to change native code you still have to update the app via the store.
2. There are safety mechanism in place so if you end up releasing a bad patch there is automatic rollback to previous version.
3. We also use fingerprinting to make sure the bundle's native code has the same fingeprint as the version in the store. Fingerprinting prevents you from even deploying a bad patch in the first place.

Realease controls

Patch gives you full control over how and when updates roll out: staged rollouts by percentage, mandatory vs. optional updates, per-platform deployment keys, and code-signing enforcement for verifying release integrity end to end.

All together

A CLI (cmpatch) and web dashboard cover the full release lifecycle of publish, promote between environments, disable, or roll back, while a lightweight React Native SDK handles checking, downloading, and installing updates on-device with configurable install modes (next restart, next resume, or immediate).

Patch can be hosted region sepecific and in a private dedicated cloud with single tenant.