# AgentMail vs LangSmith: who uses which

On usedby, 13 companies use AgentMail and 43 use LangSmith. 2 companies use both, including Factory and Clay. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-25: 50 of 56 public lines checked.

## Side by side

|  | [AgentMail](https://www.usedby.ai/tools/agentmail.md) | [LangSmith](https://www.usedby.ai/tools/langsmith.md) |
|---|---|---|
| Public customers | 13 | 43 |
| Confirmed | 0 | 0 |
| Observed | 13 | 42 |
| Signals (job posts) | 0 | 1 |
| Top industries of customers (every proof level) | DevTools & Infrastructure (2), Sales Tech & CRM (2), Artificial Intelligence (1) | HR & Recruiting (5), Fintech & Payments (4), DevTools & Infrastructure (3) |
| Category | Agent frameworks & AI gateways | LLM observability & evals |
| Free trial | — | Free trial or free plan available. ([langchain.com](https://www.langchain.com/pricing), checked 2026-10-21) |
| Pricing | — | Developer: $0 seat per month; Plus: $39 seat per month; Enterprise: contact sales ([langchain.com](https://www.langchain.com/pricing), checked 2026-10-21) |

## Companies that use both

Every proof level counts; the proof level of each side is shown, strongest proofs first. The first public proof is not an adoption date.

| Company | Proof, AgentMail | Proof, LangSmith | First public proof, LangSmith |
|---|---|---|---|
| [Factory](https://www.usedby.ai/companies/factory.md) | Observed | Observed | On or before December 2024 |
| [Clay](https://www.usedby.ai/companies/clay.md) | Observed | Observed | On or before March 2026 |

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Source: https://www.usedby.ai/compare/agentmail-vs-langsmith · How we check: https://www.usedby.ai/methodology