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| Metric | LangChain.js | LangChain | LlamaIndex | Haystack |
|---|---|---|---|---|
| Stars | 18.3k | 149k | 52.8k | 27k |
| Weekly downloads | 4.1M | 34.9M | 401k | 143k |
| Download growth | +21% | -8% | -36% | +10% |
| Popularity score | 79/100 | 93/100 | 76/100 | 71/100 |
| Forks | 3.5k | 25.1k | 8.5k | 3.4k |
| Open issues | 788 | 738 | 1.3k | 151 |
| Last commit | 1d ago | 2d ago | 5d ago | today |
| Latest version | 1.6.5 | 1.5.0Nov 11, 2026 | 0.14.25Sep 21, 2026 | 3.5.0Nov 10, 2026 |
| License | MIT | MIT | MIT | Apache-2.0 |
| First released | 2023 | 2022 | 2022 | 2019 |
| Signals | None | Popular | Popular | None |
| Listed in | AI & Machine Learning › LLM App Frameworks | AI & Machine Learning › LLM App Frameworks | AI & Machine Learning › LLM App Frameworks | AI & Machine Learning › LLM App Frameworks |
Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): LangChain.js.