Braintrust vs Speakeasy: who uses which
Customers, public proof and the companies that use both.
On usedby, 41 companies use Braintrust and 47 use Speakeasy. 1 company uses both, including Vercel. Braintrust leads among the DevTools & Infrastructure companies on usedby that use either tool, Speakeasy among the Data & Analytics companies.Latest check Nov 12, 2026: 88 of 88 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, Speakeasy, or both
Every company with a public proof for at least one of the two tools.
40
listed for Braintrust only
1
company uses both
46
listed for Speakeasy only
On usedby, 40 companies are listed for Braintrust only, 46 are listed for Speakeasy only and 1 uses both, out of the 87 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
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, Braintrust |
|---|---|
 Vercel | On or before Apr 2025 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Braintrust, Speakeasy or both: a share of the companies on usedby, not of the market.
Listed for Braintrust onlyBothListed for Speakeasy only
More common with Braintrust
- DevTools & Infrastructure12 of the 19 DevTools & Infrastructure companies on usedby that use either tool use Braintrust, 1 of them alongside Speakeasy.
More common with Speakeasy
- Data & Analytics4 of the 6 Data & Analytics companies on usedby that use either tool use Speakeasy.
- Cybersecurity3 of the 5 Cybersecurity companies on usedby that use either tool use Speakeasy.
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: Braintrust, 4 of 6; Speakeasy, 3 of 6. Missing facts remain unverified, not absent features.
BraintrustSpeakeasyWhat 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 Nov 10, 2026
Continuous signal, 30-min fix cycles
Rex
Vendor case study, braintrust.dev, captured Nov 10, 2026
Speakeasy
We had one developer spending at least 5 hours/week generating new SDKs for every API release.
Formance
Vendor case study, speakeasy.com, captured Nov 12, 2026
8X reduction in expected cost of Terraform Provider
Epilot
Vendor case study, speakeasy.com, captured Nov 12, 2026
Questions about Braintrust and Speakeasy
Which is used more, Braintrust or Speakeasy?
Speakeasy has more customers on usedby: 47 against 41 for Braintrust. Braintrust leads among the DevTools & Infrastructure companies on usedby that use either tool, Speakeasy among the Data & Analytics companies.
Do companies use both Braintrust and Speakeasy?
Yes. 1 company uses both on usedby, including Vercel.
Who uses Braintrust?
41 companies on usedby, each with the public page that shows it. See who uses Braintrust.
Who uses Speakeasy?
47 companies on usedby, each with the public page that shows it. See who uses Speakeasy.
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.