LangSmith vs SigNoz: who uses which
Customers, public proof and the companies that use both.
On usedby, 47 companies use LangSmith and 52 use SigNoz. 2 companies use both, including Cisco and Salesforce. LangSmith leads among the Fintech & Payments companies on usedby that use either tool, SigNoz among the Artificial Intelligence companies.Latest check Nov 13, 2026: 93 of 99 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, SigNoz, 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
50
listed for SigNoz only
On usedby, 45 companies are listed for LangSmith only, 50 are listed for SigNoz only and 2 use both, out of the 97 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 |
 Salesforce | On or before Sep 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use LangSmith, SigNoz or both: a share of the companies on usedby, not of the market.
Listed for LangSmith onlyBothListed for SigNoz 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.
- IT Services & System Integration4 of the 5 IT Services & System Integration companies on usedby that use either tool use LangSmith.
More common with SigNoz
- Artificial Intelligence6 of the 9 Artificial Intelligence companies on usedby that use either tool use SigNoz.
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; SigNoz, 0 of 5. Missing facts remain unverified, not absent features.
LangSmithSigNozWhat customers report
Results as the vendor or the customer published them, with the source and the date.
LangSmith
SigNoz
save 6 hours of precious developer time on an average daily
Mailmodo
Vendor case study, signoz.io, captured Nov 13, 2026
the backend response time is 35% faster
Outplay
Vendor case study, signoz.io, captured Nov 13, 2026
Questions about LangSmith and SigNoz
Which is used more, LangSmith or SigNoz?
SigNoz has more customers on usedby: 52 against 47 for LangSmith. LangSmith leads among the Fintech & Payments companies on usedby that use either tool, SigNoz among the Artificial Intelligence companies.
Do companies use both LangSmith and SigNoz?
Yes. 2 companies use both on usedby, including Cisco and Salesforce.
Who uses LangSmith?
47 companies on usedby, each with the public page that shows it. See who uses LangSmith.
Who uses SigNoz?
52 companies on usedby, each with the public page that shows it. See who uses SigNoz.
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.