Google’s new toolkit for developers to help them build Android faster Updated: Updated: Jetpack compose is application programming interface (API), and has been under works since 2019. Share Article Jetpack compose is application programming interface (API), and has been under works since 2019. (Subscribe to our Today's Cache newsletter for a quick snapshot of top 5 tech stories. Click here to subscribe for free.) Google has launched the beta version of Jetpack Compose, a toolkit for writing user interfaces for Android Apps. The tech giant said the new toolkit is designed to make it faster and easier for developers to build their apps across all Android platforms.