head to head · open source
LangWatch vs OpenLIT
LangWatch has 4,833 GitHub stars, 395 forks, 939 open issues and last shipped yesterday. OpenLIT has 2,772 stars, 394 forks, 60 open issues and last shipped yesterday. LangWatch leads on adoption by 74% (4,833 vs 2,772 stars). LangWatch is written in TypeScript under Apache-2.0; OpenLIT is written in TypeScript under Apache-2.0. LangWatch has attracted 8% as many forks as stars, OpenLIT 14%. LangWatch 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
| LangWatch | OpenLIT | |
|---|---|---|
| GitHub stars | ★ 4.8K | ★ 2.8K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-19 | 2026-09-19 |
| Forks | ⑂ 395 | ⑂ 394 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick LangWatch if
- You weight community size — 4.8K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick OpenLIT if
- You want the OpenLIT feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and OpenLIT fits your workflow better
About LangWatch
LangWatch is an open source TypeScript platform for LLM evaluations and AI agent testing, licensed under Apache 2.0. It lives in the machine learning infrastructure ecosystem for teams that build LLM powered agents and need to test, simulate, evaluate, and monitor agents before release and in production.
read the full LangWatch overview →
About OpenLIT
OpenLIT is an open source, OpenTelemetry native observability and evaluation platform for AI applications, AI agents and coding agents, built for engineers who run LLM backed systems and need to see what those systems actually did.
read the full OpenLIT overview →
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Frequently asked questions
Is LangWatch or OpenLIT more popular?
LangWatch has 4,833 GitHub stars and OpenLIT has 2,772. LangWatch has the larger community by that measure.
Are LangWatch and OpenLIT free?
Both are open source. LangWatch is licensed under Apache-2.0 and OpenLIT under Apache-2.0. Neither carries a licence fee.
What is the difference between LangWatch and OpenLIT ?
LangWatch is written in TypeScript and OpenLIT in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, LangWatch or OpenLIT ?
Choose LangWatch if you want the larger community (4,833 stars) or its Apache-2.0 licence terms. Choose OpenLIT if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.