On usedby, 183 companies use Claude and 20 use Exa. 3 companies use both, including CodeRabbit, Cursor, and Legora. Claude leads among the DevTools & Infrastructure companies on usedby that use either tool.Latest check Nov 12, 2026: 177 of 203 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 Claude, Exa, or both
Every company with a public proof for at least one of the two tools.
180
listed for Claude only
3
companies use both
17
listed for Exa only
On usedby, 180 companies are listed for Claude only, 17 are listed for Exa only and 3 use both, out of the 200 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 2, 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, Claude |
|---|---|
 CodeRabbit | On or before Oct 2026 |
 Cursor | On or before Oct 2026 |
 Legora | On or before Sep 2025 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Claude, Exa or both: a share of the companies on usedby, not of the market.
Listed for Claude onlyBothListed for Exa only
More common with Claude
- DevTools & Infrastructure28 of the 31 DevTools & Infrastructure companies on usedby that use either tool use Claude, 2 of them alongside Exa.
- Artificial Intelligence28 of the 30 Artificial Intelligence companies on usedby that use either tool use Claude.
- Fintech & Payments18 of the 19 Fintech & Payments companies on usedby that use either tool use Claude.
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: Claude, 5 of 6; Exa, 0 of 6. Missing facts remain unverified, not absent features.
Claude
ExaWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Claude
Cuts the time to complete an agreement 10x, from roughly 10 hours of lawyer work to about one
Spellbook
Vendor case study, claude.com, captured Oct 30, 2026
Gave around 700 people access to Claude Code and Claude Cowork to date
Pictet
Vendor case study, claude.com, captured Oct 30, 2026
Exa
More than 9.1M Search requests to date
HockeyStack
Vendor case study, exa.ai, captured Nov 12, 2026
More than 7.2M Search requests to date: 11x uses Exa Search for high-volume prospect and account research.
11X
Vendor case study, exa.ai, captured Nov 12, 2026
Questions about Claude and Exa
Which is used more, Claude or Exa?
Claude has more customers on usedby: 183 against 20 for Exa.
Do companies use both Claude and Exa?
Yes. 3 companies use both on usedby, including CodeRabbit, Cursor, and Legora.
Who uses Claude?
183 companies on usedby, each with the public page that shows it. See who uses Claude.
Who uses Exa?
20 companies on usedby, each with the public page that shows it. See who uses Exa.
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.