CallMiner vs Sierra: who uses which
Customers, public proof and the companies that use both.
On usedby, 39 companies use CallMiner and 50 use Sierra. 3 companies use both, including Santander, CarMax, and SiriusXM. Sierra leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 8, 2026: 89 of 89 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 CallMiner, Sierra, or both
Every company with a public proof for at least one of the two tools.
36
use only CallMiner
3
companies use both
47
use only Sierra
36 companies use only CallMiner, 47 use only Sierra and 3 use both, out of the 86 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 8, 2026.
Where it lands
Newest customers
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Sierra |
|---|---|
 Santander | On or before Aug 2026 |
 CarMax | On or before Aug 2026 |
 SiriusXM | On or before Feb 2024 |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
CallMiner
SierraWhat customers report
Results as the vendor or the customer published them, with the source and the date.
CallMiner
No reviewed story for CallMiner yet.
Sierra
Nearly 1,000 hours per month returned to exception handling and high-value work
RunBuggy
Vendor case study, sierra.ai, published Feb 3, 2026
Questions about CallMiner and Sierra
Which is used more, CallMiner or Sierra?
Sierra has more customers on usedby: 50 against 39 for CallMiner.
Do companies use both CallMiner and Sierra?
Yes. 3 companies use both on usedby, including Santander, CarMax, and SiriusXM.
Who uses CallMiner?
39 companies on usedby, each with the public page that shows it. See who uses CallMiner.
Who uses Sierra?
50 companies on usedby, each with the public page that shows it. See who uses Sierra.
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.