AgentMail vs LangSmith: who uses which
Customers, public proof and the companies that use both.
On usedby, 13 companies use AgentMail and 43 use LangSmith. 2 companies use both, including Factory and Clay. LangSmith leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 25, 2026: 50 of 56 public lines checked. Counts include every proof level, job-post signals included. A company on both tools counts at any proof level, and a job post on one side is marked as such.
Who uses AgentMail, LangSmith, or both
Every company with a public proof for at least one of the two tools.
11
listed for AgentMail only
2
companies use both
41
listed for LangSmith only
On usedby, 11 companies are listed for AgentMail only, 41 are listed for LangSmith only and 2 use both, out of the 54 companies listed for at least one. An absent listing does not prove non-use.
Who uses both
Companies with a public line on both tools, at any proof level: the strongest proofs come first, and a job post is marked.
| Company | First public proof, LangSmith |
|---|---|
 Factory | On or before Dec 2024 |
 Clay | On or before Mar 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use AgentMail, LangSmith or both: a share of the companies on usedby, not of the market.
Listed for AgentMail onlyBothListed for LangSmith only
More common with LangSmith
- Fintech & Payments4 of the 5 Fintech & Payments companies on usedby that use either tool use LangSmith.
- HR & Recruiting5 of the 5 HR & Recruiting companies on usedby that use either tool use LangSmith.
Source: every usedby line, from confirmed proofs to job-post signals (the weakest proof level).
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
AgentMailLangSmithQuestions about AgentMail and LangSmith
Which is used more, AgentMail or LangSmith?
LangSmith has more customers on usedby: 43 against 13 for AgentMail.
Do companies use both AgentMail and LangSmith?
Yes. 2 companies use both on usedby, including Factory and Clay.
Who uses AgentMail?
13 companies on usedby, each with the public page that shows it. See who uses AgentMail.
Who uses LangSmith?
43 companies on usedby, each with the public page that shows it. See who uses LangSmith.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of four proof levels: confirmed, declared by the company itself, observed or signal (a job post, the weakest). A company counts as using both tools when it has a line on each, at any level; the list shows the strongest proofs first and marks job posts.