Langfuse vs LangSmith: who uses which
Customers, public proof and the companies that use both.
On usedby, 17 companies use Langfuse and 47 use LangSmith. 1 company uses both, including Cisco. LangSmith leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Nov 12, 2026: 58 of 64 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 Langfuse, LangSmith, or both
Every company with a public proof for at least one of the two tools.
16
listed for Langfuse only
1
company uses both
46
listed for LangSmith only
On usedby, 16 companies are listed for Langfuse only, 46 are listed for LangSmith only and 1 uses both, out of the 63 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.
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 |
|---|---|
 Cisco | On or before May 2025 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Langfuse, LangSmith or both: a share of the companies on usedby, not of the market.
Listed for Langfuse onlyBothListed for LangSmith only
More common with LangSmith
- Artificial Intelligence3 of the 5 Artificial Intelligence 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.
Vendor facts checked: Langfuse, 0 of 5; LangSmith, 3 of 5. Missing facts remain unverified, not absent features.
LangfuseLangSmithWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Langfuse
No reviewed story for Langfuse yet.
LangSmith
Questions about Langfuse and LangSmith
Which is used more, Langfuse or LangSmith?
LangSmith has more customers on usedby: 47 against 17 for Langfuse.
Do companies use both Langfuse and LangSmith?
Yes. 1 company uses both on usedby, including Cisco.
Who uses Langfuse?
17 companies on usedby, each with the public page that shows it. See who uses Langfuse.
Who uses LangSmith?
47 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.