Devtoolwatch BoardLangChain4j review
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.
- 13.3kGitHub stars
- +53new stars, week of Oct 25
- #39in Agent frameworks this week
LangChain4j at a glance
- Category
- Agent frameworks
- Website
- docs.langchain4j.dev
Is LangChain4j growing? Usage data
In the week of Oct 25–31, 2026, LangChain4j ranked #350 on the Devtoolwatch Board and #39 in Agent frameworks, with a momentum score of 21 out of 100.
Show the weekly numbers
| Week of | New stars |
|---|---|
| Aug 9, 2026 | 67 |
| Aug 16, 2026 | 59 |
| Aug 23, 2026 | 51 |
| Aug 30, 2026 | 57 |
| Sep 6, 2026 | 59 |
| Sep 13, 2026 | 55 |
| Sep 20, 2026 | 39 |
| Sep 27, 2026 | 43 |
| Oct 4, 2026 | 30 |
| Oct 11, 2026 | 44 |
| Oct 18, 2026 | 40 |
| Oct 25, 2026 | 53 |
The Board ranks tools by four signals each week: new stars, new stars for the repo's size, added downloads and download growth beyond the market. How the ranking works.
LangChain4j alternatives
Other AI agent frameworks on the Board in the week of Oct 25–31, 2026, by momentum:
| Rank | Tool | Stars | Downloads/wk |
|---|---|---|---|
| #1 | Harness²Harness² is a Python framework from Google Research for recursive agent harnessing, refining an agent's prompts, tools, memory and… | 21.7k | – |
| #2 | HyperFramesHyperFrames is an open-source framework that turns HTML, CSS, media, and seekable animations into deterministic MP4 videos, built for AI… | 76.6k | 1.5M |
| #3 | AgentScopeAgentScope is a Python agent framework with an SDK for building ReAct agents and an agent service backend with a web UI. | 35k | 51.4k |
| #4 | AG-UIAG-UI is an open, event-based protocol that standardizes how AI agents connect to user-facing frontend applications. | 16.9k | 4.6M |
| #5 | LangGraphLangGraph is a low-level orchestration framework and runtime for building, managing, and deploying long-running, stateful agents in… | 44.2k | 18.5M |
| #6 | BifrostOpen-source, high-performance AI gateway that works as your LLM gateway, MCP gateway and agent gateway. One OpenAI-compatible API for… | 9.3k | – |
LangChain4j FAQ
How popular is LangChain4j?
LangChain4j has 13.3k GitHub stars as of Nov 1, 2026. It gained 53 new stars in the week of Oct 25–31, 2026, against a 12-week average of 50 a week. That made it #39 among AI agent frameworks on the Devtoolwatch Board.
What are the best alternatives to LangChain4j?
Other AI agent frameworks on the Devtoolwatch Board in the week of Oct 25–31, 2026, by momentum: Harness² (#1), HyperFrames (#2), AgentScope (#3), AG-UI (#4), LangGraph (#5). The alternatives table above has their numbers.
Sources
LangChain4j README badge
Maintainers can show the tool's weekly Board rank in their README:
[](https://index.devtoolwatch.com/tools/langchain4j/)How this page is made: Devtoolwatch writes each review from the project's README, releases, package metadata and website, with an AI model, then checks every claim against the source it cites and drops what the sources don't support. The numbers come from Devtoolwatch's daily GitHub snapshots, GitHub's stargazer history, and the npm and PyPI download APIs. Spotted an error? Email [email protected].