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| What matters | 🧩 Langfuse | 🧩 LangSmith |
|---|---|---|
| What it does | Langfuse records LLM traces, manages prompt versions and supports evaluations. | LangSmith helps developers inspect LLM runs and evaluate application behaviour. |
| Best for | Open-source LLM observability and prompt versions | Tracing and evaluating LLM applications |
| Pricing model | Free plan + paid | Free plan + paid |
| Free-plan limits | Cloud Hobby is free with 50,000 units/month and 30-day historical access, no card required. Higher tiers and self-hosted enterprise features have separate terms; model API use is not included. | Developer is USD 0 with one seat and 5,000 base traces/month; extra usage is metered. Plus and deployment options add costs. Check retention and trace types on the pricing page. |
| Platforms | Web, API | Web, API |
| Key capabilities | LLM tracing Prompt versions Datasets Evaluation scores Token cost tracking | Application tracing LLM evaluations Datasets Prompt iteration Run inspection |
| Strengths | Prompt versions make it easier to connect an output change to a release Cost tracking helps identify expensive stages instead of guessing Cloud and self-hosted options offer different operational tradeoffs | Trace inspection makes multi-step failures easier to locate A saved dataset gives prompt changes a repeatable comparison Evaluation separates a convincing answer from one that passes your task criteria |
| Limitations | A trace can contain user content, so retention and access need planning Self-hosting shifts database and upgrade maintenance to your team | Useful evaluation requires labelled examples and clear success criteria Trace allowances, deployment compute and model API costs are separate |
| No signup required | Not verified | Not verified |
| No credit card required | Yes | Yes |
| Open source | Yes | Not verified |
| Free trial | No | No |
| Access details reviewed | 2026-10-09 | 2026-10-09 |
| Official pricing / source | Check pricingAccess source | Check pricingAccess source |
| Next step | Explore Langfuse | Explore LangSmith |