head to head · open source
SigNoz vs langsmith-sdk
SigNoz has 32,146 GitHub stars, 2,497 forks, 1,557 open issues and last shipped today. langsmith-sdk has 1,060 stars, 298 forks, 216 open issues and last shipped yesterday. SigNoz leads on adoption by 2,933% (32,146 vs 1,060 stars). SigNoz is written in TypeScript under a custom or non-standard licence; langsmith-sdk is written in Python under MIT. SigNoz has attracted 8% as many forks as stars, langsmith-sdk 28%. SigNoz was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (observability), so they are genuine substitutes rather than adjacent tools.
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
| SigNoz | langsmith-sdk | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 1.1K |
| License | Custom / other | MIT |
| Written in | TypeScript | Python |
| Last push | 2026-09-20 | 2026-09-19 |
| Forks | ⑂ 2.5K | ⑂ 298 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SigNoz if
- You weight community size — 32K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick langsmith-sdk if
- You want the langsmith-sdk feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and langsmith-sdk fits your workflow better
About SigNoz
SigNoz is an open source, OpenTelemetry native observability platform for cloud native applications. It unifies logs, metrics, traces, alerts, and dashboards into a single tool, replacing fragmented monitoring stacks with a correlated signal pipeline. It lives in the observability ecosystem alongside tools like Prometheus, Jaeger, and Grafana, and is positioned as an open alternative to Datadog.
read the full SigNoz overview →
About langsmith-sdk
LangSmith SDK is the official pair of Python and JavaScript client libraries for the LangSmith platform, built and maintained by LangChain for teams that need to debug, evaluate, and monitor language models and intelligent agents.
read the full langsmith-sdk overview →
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Frequently asked questions
Is SigNoz or langsmith-sdk more popular?
SigNoz has 32,146 GitHub stars and langsmith-sdk has 1,060. SigNoz has the larger community by that measure.
Are SigNoz and langsmith-sdk free?
Both are open source. SigNoz has no licence declared in this registry, and langsmith-sdk is licensed under MIT. Both are free to self-host.
What is the difference between SigNoz and langsmith-sdk?
SigNoz is written in TypeScript and langsmith-sdk 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, SigNoz or langsmith-sdk?
Choose SigNoz if you want the larger community (32,146 stars) or its Custom / other licence terms. Choose langsmith-sdk if its feature set, stack or MIT licence fits better. Both are self-hostable.