Koog
JetBrains' Kotlin framework for building predictable, enterprise-ready AI agents on the JVM.
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About Koog
Koog is listed in our frameworks category and is aimed at builders. JetBrains' Kotlin framework for building predictable, enterprise-ready AI agents on the JVM. Pricing, as the maker states it: Open source. Maturity: Active. We last checked the official link on 2026-10-16.
What is Koog?
Koog is JetBrains' framework for building and running AI agents in idiomatic Kotlin and Java. Agents can use tools, handle complex workflows and talk with users.
It supports Kotlin Multiplatform deployment to JVM, JS, WasmJS, Android and iOS, and offers reliability features such as built-in retries and agent persistence to restore state at specific points.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: docs.koog.ai.
Who is Koog for?
Kotlin and Java developers building predictable agents for the JVM and mobile.
Koog at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: JetBrains/koog · 4,623 stars (as of Oct 21, 2026)
Key features
- Idiomatic Kotlin and Java APIs
- Kotlin Multiplatform targets
- Retries and state persistence
Koog FAQ
What is Koog?
Koog is JetBrains' framework for building and running AI agents in idiomatic Kotlin and Java. Agents can use tools, handle complex workflows and talk with users.
Who is Koog for?
Kotlin and Java developers building predictable agents for the JVM and mobile.
Is Koog free?
Koog's pricing, as the maker states it: Open source. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is Koog open source?
Yes. Koog is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to Koog?
Similar tools include Parlant, CAMEL, Microsoft Agent Framework, BaseAI, RubyLLM and BabyAGI.
Koog ratings and reviews
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Koog alternatives
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BaseAI
Web AI framework from Langbase for building AI agents with memory (RAG) and deploying them serverless.
RubyLLM
Ruby framework for working with LLMs, including chat, tools and agents, through one API.
BabyAGI
Yohei Nakajima's experimental self-building agent framework that creates, stores and runs its own functions.
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