# RevenueCat Documentation — SDK Guides

> Major-version migration guides for the iOS and Android native SDKs. Part of the RevenueCat documentation for building in-app purchases and subscriptions.

Each link below points to the Markdown version of a page in this section. For every other section, see the root index at [llms.txt](https://www.revenuecat.com/docs/llms.txt). For the complete documentation as a single Markdown file, see [llms-full.txt](https://www.revenuecat.com/docs/llms-full.txt).

## SDK Guides

- [Android Native - 4.x to 5.x Migration](https://www.revenuecat.com/docs/sdk-guides/android-native-4x-to-5x-migration.md)
- [Android Native - 5.x to 6.x Migration](https://www.revenuecat.com/docs/sdk-guides/android-native-5x-to-6x-migration.md): New Google subscription model migration
- [Android Native - 6.x to 7.x Migration](https://www.revenuecat.com/docs/sdk-guides/android-native-6x-to-7x-migration.md)
- [Android Native - 7.x to 8.x Migration](https://www.revenuecat.com/docs/sdk-guides/android-native-7x-to-8x-migration.md)
- [Android Native - 8.x to 9.x Migration](https://www.revenuecat.com/docs/sdk-guides/android-native-8x-to-9x-migration.md)
- [iOS Native - 3.x to 4.x Migration](https://www.revenuecat.com/docs/sdk-guides/ios-native-3x-to-4x-migration.md)
- [iOS Native - 4.x to 5.x Migration](https://www.revenuecat.com/docs/sdk-guides/ios-native-4x-to-5x-migration.md)