langchain4j is an open-source chat app written in Java, released under the Apache-2.0 license. The repository has collected 13k stars and 2.7k forks; the latest push was in October 2026. Related topics: anthropic, chatgpt and chroma.
“LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.”
— langchain4j, project description on GitHub
Details
| Category | Chat UIs |
|---|---|
| GitHub stars | 13,259 |
| Forks | 2,716 |
| Language | Java |
| License | Apache-2.0 |
| Last updated | |
| Owner | langchain4j |
| Website | docs.langchain4j.dev |
| Repository | langchain4j/langchain4j |
Tags
anthropicchatgptchromaembeddingsgeminigpthuggingfacejava
Repository facts from the GitHub public API, refreshed October 18, 2026. The quoted tagline is written by the project owner; the summary above is generated from public facts.