On usedby, 48 companies use Clay and 30 use Warmly. 1 company uses both, including Pendo. Clay leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Oct 8, 2026: 77 of 78 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 Clay, Warmly, or both
Every company with a public proof for at least one of the two tools.
47
use only Clay
1
company uses both
29
use only Warmly
47 companies use only Clay, 29 use only Warmly and 1 uses both, out of the 77 companies on usedby that use at least one of them.
Where it lands
Newest customers
We have not started tracking changes for Clay yet.
Where it lands
Newest customers
No new customer since tracking started on October 8, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Pendo |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Clay, Warmly or both: a share of the companies on usedby, not of the market.
Clay onlyBothWarmly 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 7 Marketing Tech companies on usedby that use either tool use Clay, 1 of them alongside Warmly.
- DevTools & Infrastructure5 of the 5 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.
Clay
WarmlyWhat customers report
Results as the vendor or the customer published them, with the source and the date.
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
Warmly
installed it on his Webflow site in about 30 seconds
ScaleU
Vendor case study, warmly.ai, captured Oct 8, 2026
A $40K deal closed in just 7 days
Behavioral Signals
Vendor case study, warmly.ai, captured Oct 8, 2026
Questions about Clay and Warmly
Which is used more, Clay or Warmly?
Clay has more customers on usedby: 48 against 30 for Warmly.
Do companies use both Clay and Warmly?
Yes. 1 company uses both on usedby, including Pendo.
Who uses Clay?
48 companies on usedby, each with the public page that shows it. See who uses Clay.
Who uses Warmly?
30 companies on usedby, each with the public page that shows it. See who uses Warmly.
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.