On usedby, 20 companies use Attio and 48 use Clay. 1 company uses both, including Legora. Clay leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Oct 5, 2026: 65 of 68 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 Attio, Clay, or both
Every company with a public proof for at least one of the two tools.
19
use only Attio
1
company uses both
47
use only Clay
19 companies use only Attio, 47 use only Clay and 1 uses both, out of the 67 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 2, 2026.
Where it lands
Newest customers
We have not started tracking changes for Clay yet.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Legora |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Attio, Clay or both: a share of the companies on usedby, not of the market.
Attio onlyBothClay only
More common with Clay
- Artificial Intelligence7 of the 8 Artificial Intelligence companies on usedby that use either tool use Clay.
- Marketing Tech7 of the 8 Marketing Tech companies on usedby that use either tool use Clay.
- DevTools & Infrastructure5 of the 7 DevTools & Infrastructure companies on usedby that use either tool use Clay.
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.
AttioClayWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Attio
generating an extra 25% in GMV per month, thanks to Attio
Passionfroot
Vendor case study, attio.com, captured Oct 2, 2026
90% team adoption overnight, up from sub 50%
Taskrabbit
Vendor case study, attio.com, captured Oct 2, 2026
Clay
new reps were revenue-generating 6x faster than before Clay
Pump
Vendor case study, clay.com, captured Oct 5, 2026
a 15% increase in enterprise meetings booked
Merge
Vendor case study, clay.com, captured Oct 5, 2026
Questions about Attio and Clay
Which is used more, Attio or Clay?
Clay has more customers on usedby: 48 against 20 for Attio.
Do companies use both Attio and Clay?
Yes. 1 company uses both on usedby, including Legora.
Who uses Attio?
20 companies on usedby, each with the public page that shows it. See who uses Attio.
Who uses Clay?
48 companies on usedby, each with the public page that shows it. See who uses Clay.
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.