Java · Apache-2.0
langchain4j/langchain4j
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.
★ 13.4k
Stars
2.7k forks · 1.1k open issues
+5.4/day
Growth · measured
Stars counted between two of our own snapshots roughly a week apart. The repository page gives the exact span.
42.5
Momentum / 100
see the breakdown below
3y ago
Created
last push 2d ago
Star history
How this score was built
| Component | Weight | Earned | Why |
|---|---|---|---|
| Velocity | 55 | 15.5 | +5.4/day, log-scaled against a 750/day ceiling |
| Acceleration | 15 | 0.1 | last week ran 1.01× the monthly pace |
| Freshness | 15 | 15.0 | last push 2d ago; decays to zero at 180 days |
| Scale | 15 | 12.0 | 13.4k stars, log-scaled against 150k — stops a 3-star repo topping the board |
| Momentum | 100 | 42.5 | sum of the above |
Detail
| Topics | anthropicchatgptchromaembeddingsgeminigpthuggingfacejavalangchainllamallmllmsmilvusollamaonnxopenaiopenai-apipgvectorpineconevector-database |
| Matched on | RAG (embeddings, vector-database) |
| Short window | +38 stars over 7 days = 5.4/day |
| Long window | +140 stars over 26 days = 5.4/day |
| Lifetime average | 10.83 stars/day over 1,234 days |
| First seen here | 2026-10-11 |
| Last read | 2d ago |