Hard facts side by side: free tiers, prices, limits, SDKs and privacy. Every value links to the official page it came from and is re-checked every week.
| Fact |  LangChain |
|---|---|
| Free tier | Free & open source MIT library; LangSmith Developer plan is free with up to 5k base traces/month, 1 seat. Source, Sep 29, 2026 |
| Starting price | Free, open source Hosted LangSmith Plus is $39/seat/month with up to 10k base traces/month, then pay-as-you-go. Source, Sep 29, 2026 |
| Rate limit | 5k traces/month LangSmith free Developer plan, then pay-as-you-go. Source, Sep 29, 2026 |
| Storage | Traces kept 14 days LangSmith base traces; extended traces kept 400 days at extra cost. Source, Sep 29, 2026 |
| Official SDKs |
| PythonJavaScript / TypeScriptSource, Sep 29, 2026 |
| Open source | Yes MIT licence Source, Sep 29, 2026 |
|---|
| Trains on your data | No Runs in your own code; LangSmith states it does not use your data to train models. Source, Sep 29, 2026 |
|---|
| EU hosting | Yes LangSmith cloud offers an EU region (eu.smith.langchain.com, GCP EU). Source, Sep 29, 2026 |
|---|
| Compliance | SOC 2ISO 27001GDPRHIPAASource, Sep 29, 2026 |
|---|
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