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Llangchain4j
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.
Popularity
Repository stars4,64513,344Highest
7-day net stars——
Fork3602,657Highest
30-day trendInsufficient historyInsufficient history
Maintenance
Last push2026-03-272026-11-02
Maintenance notesUnknownNot verified
Repository created2022-12-122023-06-20
License & use
LicenseApache-2.0 · PermissiveApache-2.0 · Permissive
PricingPricing not verifiedPricing not verified
Basics
Browse by purposeAI & agents · Developer toolsAI & agents · Developer tools
TypeFrameworks & SDKsFrameworks & SDKs
SubcategoryModel SDKsModel SDKs
PlatformNot verifiedNot verified
Cost detailsVerify software, hosting, model and infrastructure costs against the current official documentation.Check current official software, hosting, model and infrastructure pricing.
Pricing source——
First collected2026-11-022026-11-03
MetricRepository Stars, not unique usersRepository stars, not unique users or individual-skill installs
LanguagePythonJava
About this projectA toolkit for prompt management and structured model output.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.
Measured at2026-11-02 19:29 UTC2026-11-02 19:00 UTC
License tiers are derived from metadata. Check obligations for your use; unknown does not mean prohibited. Ranked by repository stars, one position per repository. Stars and forks are not user counts.