Arize AI vs Braintrust: who uses which
Customers, public proof and the companies that use both.
On usedby, 35 companies use Arize AI and 39 use Braintrust. 1 company uses both, including Instacart. Arize AI leads among the Travel & Hospitality companies on usedby that use either tool, Braintrust among the DevTools & Infrastructure companies.Latest check Oct 7, 2026: 69 of 74 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, Braintrust, 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
38
use only Braintrust
34 companies use only Arize AI, 38 use only Braintrust and 1 uses both, out of the 73 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
We have not started tracking changes for Braintrust yet.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Instacart |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Arize AI, Braintrust or both: a share of the companies on usedby, not of the market.
Arize AI onlyBothBraintrust only
More common with Arize AI
- Travel & Hospitality4 of the 6 Travel & Hospitality companies on usedby that use either tool use Arize AI.
More common with Braintrust
- DevTools & Infrastructure10 of the 12 DevTools & Infrastructure companies on usedby that use either tool use Braintrust.
- Fintech & Payments4 of the 5 Fintech & Payments companies on usedby that use either tool use Braintrust.
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 AIBraintrustWhat 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
Braintrust
Continuous signal, 30-min fix cycles
Rex
Vendor case study, braintrust.dev, captured Oct 6, 2026
Questions about Arize AI and Braintrust
Which is used more, Arize AI or Braintrust?
Braintrust has more customers on usedby: 39 against 35 for Arize AI. Arize AI leads among the Travel & Hospitality companies on usedby that use either tool, Braintrust among the DevTools & Infrastructure companies.
Do companies use both Arize AI and Braintrust?
Yes. 1 company uses both on usedby, including Instacart.
Who uses Arize AI?
35 companies on usedby, each with the public page that shows it. See who uses Arize AI.
Who uses Braintrust?
39 companies on usedby, each with the public page that shows it. See who uses Braintrust.
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.