Koog
JetBrains' Kotlin and Java framework for predictable, fault-tolerant AI agents across JVM, Android, iOS and the browser.
Sources and review
Checked against public documentation on . Suitability guidance is our editorial judgment; this is not a performance benchmark or an endorsement.
JVM and Android teams that want agents in their own stack rather than in Python.
Your team works mainly in Python or TypeScript, where larger agent ecosystems exist.
About Koog
Koog, from JetBrains, builds and runs AI agents in idiomatic Kotlin and Java. It deploys across JVM, JS, WasmJS, Android and iOS through Kotlin Multiplatform, recovers from failures with retries and agent-state persistence, compresses conversation history to save tokens, and integrates with JVM frameworks such as Spring Boot and Ktor.
Koog is an open-source project written primarily in Kotlin, with 4.6k stars on GitHub. It was last updated in September 2026.
