LangSmith vs Promptfoo
| Tagline | Debug, test and monitor LLM apps and agents | Test and red-team LLM apps |
|---|---|---|
| Category | AI Agents | AI Agents |
| Pricing | Freemium | Open Source |
| Upvotes | 0 | 0 |
| Comments | 0 | 0 |
| Page views | 0 | 0 |
| Click-through to site | 0.0% | 0.0% |
| Readiness Score | 81/100 | 90/100 |
| Launched | Oct 5, 2026 | Oct 5, 2026 |
| Maker | — | — |
What is LangSmith?
LangSmith from LangChain helps teams trace, evaluate and monitor LLM applications and agents in development and production.
What is Promptfoo?
Promptfoo runs evaluations and security tests against prompts, models and agents.
Not sold on either? See alternatives to LangSmith or alternatives to Promptfoo.
Verdict
Promptfoo leads on 1 of the measurable metrics above (votes, engagement, click-through and readiness). Choose LangSmith if you want debug, test and monitor LLM apps and agents; choose Promptfoo if you want test and red-team LLM apps.
Is LangSmith better than Promptfoo?
On AskableHQ's community and engagement data, Promptfoo currently performs better, but the right choice depends on your use case.
Which is cheaper, LangSmith or Promptfoo?
LangSmith is Freemium; Promptfoo is Open Source. Check each website for current plans.