head to head · open source
GPT4All vs llama_index
GPT4All has 77,399 GitHub stars, 8,291 forks, 771 open issues and last shipped 1.3 years ago. llama_index has 52,202 stars, 8,162 forks, 770 open issues and last shipped yesterday. GPT4All leads on adoption by 48% (77,399 vs 52,202 stars). GPT4All is written in C++ under MIT; llama_index is written in Python under MIT. GPT4All has attracted 11% as many forks as stars, llama_index 16%. llama_index 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.
← all 8884 open source comparisons
Side by side
| GPT4All | llama_index | |
|---|---|---|
| GitHub stars | ★ 77K | ★ 52K |
| License | MIT | MIT |
| Written in | C++ | Python |
| Last push | 2025-05-27 | 2026-09-17 |
| Forks | ⑂ 8.3K | ⑂ 8.2K |
| 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 llama_index if
- You want the llama_index feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and llama_index 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 llama_index
LlamaIndex is an MIT licensed, open source Python framework for building agentic applications — retrieval augmented generation systems, agents and multi agent workflows — on top of private documents and data, and it is aimed at AI engineers and teams who need to connect large language models to their own sources of context.
read the full llama_index overview →
More in AI & Machine Learning
Related comparisons
More Machine Learning Infrastructure projects
Compare either of these against the rest of the Machine Learning Infrastructure field.
Frequently asked questions
Is GPT4All or llama_index more popular?
GPT4All has 77,399 GitHub stars and llama_index has 52,202. GPT4All has the larger community by that measure.
Are GPT4All and llama_index free?
Both are open source. GPT4All is licensed under MIT and llama_index under MIT. Neither carries a licence fee.
What is the difference between GPT4All and llama_index?
GPT4All is written in C++ and llama_index in Python. 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 llama_index?
Choose GPT4All if you want the larger community (77,399 stars) or its MIT licence terms. Choose llama_index if its feature set, stack or MIT licence fits better. Both are self-hostable.