head to head · open source
GPT4All vs langchain4j
GPT4All has 77,399 GitHub stars, 8,291 forks, 771 open issues and last shipped 1.3 years ago. langchain4j has 13,116 stars, 2,555 forks, 878 open issues and last shipped 2 days ago. GPT4All leads on adoption by 490% (77,399 vs 13,116 stars). GPT4All is written in C++ under MIT; langchain4j is written in Java under Apache-2.0. GPT4All has attracted 11% as many forks as stars, langchain4j 19%. langchain4j was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| GPT4All | langchain4j | |
|---|---|---|
| GitHub stars | ★ 77K | ★ 13K |
| License | MIT | Apache-2.0 |
| Written in | C++ | Java |
| Last push | 2025-05-27 | 2026-09-16 |
| Forks | ⑂ 8.3K | ⑂ 2.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GPT4All if
- You weight community size — 77K stars and counting
- You want the MIT license terms
- Your stack matches C++
- You value the larger contributor base for long-term maintenance
pick langchain4j if
- You want the langchain4j feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and langchain4j fits your workflow better
About GPT4All
GPT4All is an MIT licensed C++ chat application and Python client from Nomic that runs large language models privately on everyday desktops and laptops, built for developers and teams who want local inference without API calls, GPUs, or sending data off device.
read the full GPT4All overview →
About langchain4j
LangChain4j is an Apache 2.0, open source, idiomatic Java library for building LLM powered applications on the JVM, aimed at Java developers and enterprise teams who want one unified API over many LLM providers and embedding stores without leaving the Java ecosystem.
read the full langchain4j overview →
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Frequently asked questions
Is GPT4All or langchain4j more popular?
GPT4All has 77,399 GitHub stars and langchain4j has 13,116. GPT4All has the larger community by that measure.
Are GPT4All and langchain4j free?
Both are open source. GPT4All is licensed under MIT and langchain4j under Apache-2.0. Neither carries a licence fee.
What is the difference between GPT4All and langchain4j?
GPT4All is written in C++ and langchain4j in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, GPT4All or langchain4j?
Choose GPT4All if you want the larger community (77,399 stars) or its MIT licence terms. Choose langchain4j if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.