Arize AI vs LangSmith: who uses which
Customers, public proof and the companies that use both.
On usedby, 35 companies use Arize AI and 43 use LangSmith. 1 company uses both, including Uber. Arize AI leads among the Marketing Tech companies on usedby that use either tool, LangSmith among the HR & Recruiting companies.Latest check Oct 6, 2026: 67 of 78 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses Arize AI, LangSmith, or both
Every company with a public proof for at least one of the two tools.
34
use only Arize AI
1
company uses both
42
use only LangSmith
34 companies use only Arize AI, 42 use only LangSmith and 1 uses both, out of the 77 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 5, 2026.
Where it lands
Newest customers
No new customer since tracking started on October 3, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Uber |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Arize AI, LangSmith or both: a share of the companies on usedby, not of the market.
Arize AI onlyBothLangSmith only
More common with Arize AI
- Marketing Tech4 of the 5 Marketing Tech companies on usedby that use either tool use Arize AI.
- Travel & Hospitality4 of the 5 Travel & Hospitality companies on usedby that use either tool use Arize AI.
More common with LangSmith
- HR & Recruiting5 of the 6 HR & Recruiting companies on usedby that use either tool use LangSmith.
- Fintech & Payments4 of the 5 Fintech & Payments companies on usedby that use either tool use LangSmith.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Arize AILangSmithWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Arize AI
The approach enabled 15+ production use cases in the first six months
Handshake
Vendor case study, arize.com, captured Oct 5, 2026
How Booking.com uses Arize AI
Booking.com
Vendor case study, arize.com, captured Oct 5, 2026
LangSmith
No reviewed story for LangSmith yet.
Questions about Arize AI and LangSmith
Which is used more, Arize AI or LangSmith?
LangSmith has more customers on usedby: 43 against 35 for Arize AI. Arize AI leads among the Marketing Tech companies on usedby that use either tool, LangSmith among the HR & Recruiting companies.
Do companies use both Arize AI and LangSmith?
Yes. 1 company uses both on usedby, including Uber.
Who uses Arize AI?
35 companies on usedby, each with the public page that shows it. See who uses Arize AI.
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 three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.