Braintrust vs OpenRouter: who uses which
Customers, public proof and the companies that use both.
On usedby, 42 companies use Braintrust and 3 use OpenRouter. 1 company uses both, including Replit. Braintrust leads among the DevTools & Infrastructure companies on usedby that use either tool.Latest check Oct 14, 2026: 45 of 45 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 Braintrust, OpenRouter, or both
Every company with a public proof for at least one of the two tools.
41
use only Braintrust
1
company uses both
2
use only OpenRouter
41 companies use only Braintrust, 2 use only OpenRouter and 1 uses both, out of the 44 companies on usedby that use at least one of them.
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, OpenRouter |
|---|---|
 Replit | On or before Oct 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Braintrust, OpenRouter or both: a share of the companies on usedby, not of the market.
Braintrust onlyBothOpenRouter only
More common with Braintrust
- DevTools & Infrastructure12 of the 13 DevTools & Infrastructure companies on usedby that use either tool use Braintrust, 1 of them alongside OpenRouter.
- Artificial Intelligence4 of the 5 Artificial Intelligence companies on usedby that use either tool use Braintrust.
- Fintech & Payments5 of the 5 Fintech & Payments companies on usedby that use either tool use Braintrust.
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.
Braintrust
OpenRouterWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Braintrust
100,000s of public eval dashboard views
Browserbase
Vendor case study, braintrust.dev, captured Oct 9, 2026
Continuous signal, 30-min fix cycles
Rex
Vendor case study, braintrust.dev, captured Oct 6, 2026
OpenRouter
No reviewed story for OpenRouter yet.
Questions about Braintrust and OpenRouter
Which is used more, Braintrust or OpenRouter?
Braintrust has more customers on usedby: 42 against 3 for OpenRouter.
Do companies use both Braintrust and OpenRouter?
Yes. 1 company uses both on usedby, including Replit.
Who uses Braintrust?
42 companies on usedby, each with the public page that shows it. See who uses Braintrust.
Who uses OpenRouter?
3 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 three proof levels: confirmed, 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.