LangSmith vs PromptLayer
A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.
 LangSmith Evaluation |  PromptLayer Evaluation | |
|---|---|---|
| Tagline | LangChain's eval + observability platform. | Lightweight prompt logging + management for OpenAI/Claude apps. |
| Category | Evaluation | Evaluation |
| Pricing | Freemium· Developer: $0 · Plus: $39 · Enterprise: Custom pricing | Freemium· Free: $0 · Pro: $49 · Team: $500 · Enterprise: Custom |
| Model | Platform (any LLM) | Platform (any LLM) |
| Editorial score | 8.7 / 10 | 7.9 / 10 |
| Use cases | LLM tracingevalsLangChain integration | prompt loggingversioningsmall teams |
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| Website | www.langchain.com | www.promptlayer.com |
Pick LangSmith if
- ✅ Tight LangChain integration
- ✅ Strong tracing UX
- ✅ Mature dataset/eval flows
- ✅ Reasonable per-seat pricing
Pick PromptLayer if
- ✅ Easiest to drop in
- ✅ Good free tier
- ✅ Decent prompt versioning
- ✅ Affordable Pro tier