LangSmith vs Requesty
LangSmith
langchain.comRequesty
requesty.aiSide by side
| Figure | LangSmith | Requesty |
|---|---|---|
| Price from | $39/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 3 | 3 |
| Spec score · LLM Gateway Software | 9.2 (#1) | 8.3 (#10) |
| Spec score · LLM gateways | 9.3 (#2) | 8.5 (#8) |
| 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. |
| Security | LangSmith's trust center lists SOC 2 Type II, ISO 27001:2022, GDPR and HIPAA compliance. | The security page states that traffic is encrypted with TLS 1.2 or higher and data at rest with AES-256. |
| Self-hosting | Enterprise customers can run LangSmith self-hosted or hybrid on Kubernetes in AWS, Google Cloud or Azure. | The enterprise page says Requesty is a managed platform and self-hosting is not offered. |
| Support | The Developer plan includes community support, and the Enterprise plan lists a support SLA. | The pricing page lists email support for Pay as you go and dedicated support with custom SLAs for Enterprise. |
| What it does | LangSmith is LangChain's framework-agnostic platform for observing, evaluating and deploying AI agents. | Requesty is an AI gateway that places one OpenAI-compatible endpoint in front of more than 600 language models. |
Plans
In their own words
LangSmith
LangSmith is a commercial agent-engineering platform for building, evaluating, deploying, monitoring, and improving AI agents. It supports offline evaluations on curated datasets and real-time scoring of production interactions. Evaluation methods include human review, heuristic checks, LLM-as-judge evaluators, pairwise comparisons, and custom Python or TypeScript evaluators. Annotation queues route runs to subject-matter experts for feedback that can calibrate evaluations, improve prompts, or augment datasets. The Playground compares prompt versions or model providers, and LangSmith chat can auto-improve prompts. Observability includes agent and retrieval tracing, token and general cost tracking, trajectory monitoring, online evaluations, and webhook or PagerDuty alerts. Traces can arrive through SDKs or an API from LangGraph, custom Python, or other stacks; SDKs are listed for Python, TypeScript, Go, and Java. Hosting ranges from cloud to hybrid and self-hosted Enterprise options. The Developer plan costs nothing, Plus costs $39 a month, and Enterprise pricing is custom.
Requesty
Requesty is a managed AI gateway that gives applications access to more than 600 models through one API. Its OpenAI-compatible API can work with existing SDK code after changing the base URL and API key. Routing features include policy and regional rules, automatic failover and load balancing. Requesty tracks cost, latency and usage, with analytics by model, user and team. Governance options include PII detection and scrubbing, content guardrails, team roles, model allowlists and audit logs. Named integrations include OpenAI, LangChain, PydanticAI, Vercel AI SDK, Haystack and LlamaIndex TS; the integrations page also lists tools such as Claude Code, Cline, VS Code, GitHub Copilot, Codex, n8n, LibreChat and OpenWebUI. The Free plan costs nothing and allows 200 requests per day. Pay as you go costs $5 a month, with a 5% markup on model cost. Enterprise pricing is custom. Requesty is available via API and web; self-hosting is not offered.