LangSmith
8.0#1 in llm gateway software$39 usage-basedFree planWebAPILinuxmacOS
VisitLangSmith vs Requesty
What both publish
| Fact | LangSmith | Requesty |
|---|---|---|
| Funding | LangChain announced a $125 million Series B at a $1.25 billion valuation on October 20, 2025. | Crunchbase lists one seed funding round with three investors, including The Twenty Minute VC and Tapestry VC, but obscures the amount. |
| Headquarters | San Francisco, California, United States | London, United Kingdom |
| Integrations | Documented integrations cover OpenAI, Anthropic, Bedrock, Gemini, Mistral, LiteLLM, OpenTelemetry, CrewAI, Vercel AI SDK, PydanticAI, AutoGen and many other frameworks and providers. | Official integration guidance covers OpenAI SDK, LangChain, PydanticAI, Vercel AI SDK, Haystack, LlamaIndex, Axios and plain HTTP. |
| Observability | Its observability features include agent tracing, cost tracking, online LLM-as-judge and code evaluations, trajectory monitoring, and webhook or PagerDuty alerts. | Requesty offers real-time cost tracking and analytics by model, user and team, plus latency and usage monitoring. |
| Rating on G2 | 4.4 out of 5 from 78 reviews. | 5 out of 5 from 3 reviews; G2 says there are not enough reviews to provide buying insight. |
| Retention | Base traces are retained for 14 days and extended traces for 180 days at an additional charge. | Prompt and output logging is on by default on self-serve plans and retained for up to 30 days in encrypted form in the EU; it can be disabled per key, and organization-wide zero data retention is available on written request. |
LangSmith plans
- DeveloperFree
- Plus$39 a month
- EnterprisePriced on request
Requesty plans
- FreeFree
- EnterprisePriced on request
- Pay as you go—
Pick LangSmith if…
LangSmith suits teams building or operating AI agents that need evaluation, prompt workflows, and observability. It supports both hosted and self-hosted deployment options.
Pick Requesty if…
Requesty suits teams that need to connect applications to multiple models and manage routing, usage, and governance centrally. Its free plan may suit users who need up to 200 requests per day.