LangSmith vs OpenRouter: who uses which
Customers, public proof and the companies that use both.
On usedby, 47 companies use LangSmith and 28 use OpenRouter. 2 companies use both, including DocsBot and Nvidia. LangSmith leads among the HR & Recruiting companies on usedby that use either tool, OpenRouter among the DevTools & Infrastructure companies.Latest check Nov 11, 2026: 69 of 75 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 LangSmith, OpenRouter, or both
Every company with a public proof for at least one of the two tools.
45
listed for LangSmith only
2
companies use both
26
listed for OpenRouter only
On usedby, 45 companies are listed for LangSmith only, 26 are listed for OpenRouter only and 2 use both, out of the 73 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
No new public customer listing since tracking started on October 3, 2026.
Where it lands
Recently publicly listed customers
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 | First public proof, OpenRouter |
|---|---|---|
 DocsBot | On or before Nov 2026 | On or before Nov 2026 |
 Nvidia | On or before May 2026 | — |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use LangSmith, OpenRouter or both: a share of the companies on usedby, not of the market.
Listed for LangSmith onlyBothListed for OpenRouter only
More common with LangSmith
- HR & Recruiting5 of the 5 HR & Recruiting companies on usedby that use either tool use LangSmith.
More common with OpenRouter
- DevTools & Infrastructure9 of the 12 DevTools & Infrastructure companies on usedby that use either tool use OpenRouter.
- Artificial Intelligence8 of the 10 Artificial Intelligence companies on usedby that use either tool use OpenRouter, 1 of them alongside 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.
Vendor facts checked: LangSmith, 3 of 5; OpenRouter, 2 of 5. Missing facts remain unverified, not absent features.
LangSmithOpenRouterWhat customers report
Results as the vendor or the customer published them, with the source and the date.
LangSmith
OpenRouter
Multiply that by 35k daily players
Pax Historia
Vendor case study, openrouter.ai, captured Oct 31, 2026
Questions about LangSmith and OpenRouter
Which is used more, LangSmith or OpenRouter?
LangSmith has more customers on usedby: 47 against 28 for OpenRouter. LangSmith leads among the HR & Recruiting companies on usedby that use either tool, OpenRouter among the DevTools & Infrastructure companies.
Do companies use both LangSmith and OpenRouter?
Yes. 2 companies use both on usedby, including DocsBot and Nvidia.
Who uses LangSmith?
47 companies on usedby, each with the public page that shows it. See who uses LangSmith.
Who uses OpenRouter?
28 companies on usedby, each with the public page that shows it. See who uses OpenRouter.
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.