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.
| For tool calling |  LangChain |  Tavily |  ZapierBuilding block |
|---|---|---|---|
| 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 | Yes 1,000 API credits per month, no credit card required. Source, Sep 29, 2026 | Yes 100 tasks/month, two-step Zaps only, 15-minute polling. 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 | $0.008 per credit Pay-as-you-go; the Project plan (4,000 credits/month) has slider-based pricing. Source, Sep 29, 2026 | $19.99/month Professional, billed annually ($29.99 monthly): 750 tasks, multi-step Zaps, premium apps. Source, Sep 29, 2026 |
|---|
| Rate limit | 5k traces/month LangSmith free Developer plan, then pay-as-you-go. Source, Sep 29, 2026 | 100 requests/min Development keys; production keys get 1,000 requests/min. Source, Sep 29, 2026 | 100 tasks/month Free plan Source, Sep 29, 2026 |
|---|
| Size limit | Not listed | 20 results per query max_results for the Search endpoint ranges 0 to 20 (default 10). Source, Sep 29, 2026 | 30 s per code step Professional/Team code steps; Free is 1 s; paid plans can extend to 10 min. Source, Sep 29, 2026 |
|---|
| Storage | Traces kept 14 days LangSmith base traces; extended traces kept 400 days at extra cost. Source, Sep 29, 2026 | Not listed | Not listed |
|---|
| Official SDKs | PythonJavaScript / TypeScriptSource, Sep 29, 2026 | PythonJavaScript / TypeScript | JavaScript / TypeScriptPython |
|---|
| Open source | Yes MIT licence Source, Sep 29, 2026 | Not listed | Not listed |
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| 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 | Not listed | Opt-out Enterprise is opted out automatically; other plans can opt out via a request form. Source, Sep 29, 2026 |
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| EU hosting | Yes LangSmith cloud offers an EU region (eu.smith.langchain.com, GCP EU). Source, Sep 29, 2026 | Not listed | No Hosted on AWS in the United States. Source, Sep 29, 2026 |
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| Compliance | SOC 2ISO 27001GDPRHIPAASource, Sep 29, 2026 | SOC 2GDPRSource, Sep 29, 2026 | SOC 2GDPRSource, Sep 29, 2026 |
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