Fathom vs Fellow: who uses which
Customers, public proof and the companies that use both.
On usedby, 10 companies use Fathom and 28 use Fellow. 1 company uses both, including Hubspot.Latest check Oct 7, 2026: 34 of 38 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 Fathom, Fellow, or both
Every company with a public proof for at least one of the two tools.
9
use only Fathom
1
company uses both
27
use only Fellow
9 companies use only Fathom, 27 use only Fellow and 1 uses both, out of the 37 companies on usedby that use at least one of them.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Hubspot |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Fathom
FellowWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Fathom
No reviewed story for Fathom yet.
Fellow
Over 90% of Jimdo has fully adopted Fellow throughout the organization.
Jimdo
Vendor case study, fellow.ai, captured Oct 7, 2026
How Jacaranda Finance uses Fellow
Jacaranda Finance
Vendor case study, fellow.ai, captured Oct 7, 2026
Questions about Fathom and Fellow
Which is used more, Fathom or Fellow?
Fellow has more customers on usedby: 28 against 10 for Fathom.
Do companies use both Fathom and Fellow?
Yes. 1 company uses both on usedby, including Hubspot.
Who uses Fathom?
10 companies on usedby, each with the public page that shows it. See who uses Fathom.
Who uses Fellow?
28 companies on usedby, each with the public page that shows it. See who uses Fellow.
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.