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Open source · Auth SDK
komposeauth (Open Source)
Open-source, full-stack authentication for Kotlin Multiplatform that I created and maintain: a Spring Authorization Server backend with a shared KMP SDK and Compose Multiplatform UI. The client SDKs are on Maven Central and the server image is on Docker Hub, so any app can add secure OAuth2 sign-in with minimal setup.
- Role
- Creator & maintainer
- When
- Oct 2025 – present
The problem
Adding sign-in to a Kotlin Multiplatform app usually means a third-party auth service: vendor lock-in, recurring costs, and less control over your users' data, the sign-in flow and the UI.
What I built
- A Spring Authorization Server backend, shipped as a Docker image on Docker Hub
- A shared Kotlin Multiplatform SDK and a Compose Multiplatform UI SDK, both on Maven Central
- OAuth2 sign-in that any app can add with minimal setup
Kotlin MultiplatformSpringOAuth2Compose Multiplatform
Outcome
- Open source under the Apache-2.0 licence
- Self-hosted, so teams keep full control of their data, flow and UI