# CallMiner vs Sierra: who uses which

On usedby, 39 companies use CallMiner and 50 use Sierra. 3 companies use both, including Santander, CarMax and SiriusXM. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side. Latest check 2026-10-08: 89 of 89 public lines checked.

## Side by side

|  | [CallMiner](https://www.usedby.ai/tools/callminer.md) | [Sierra](https://www.usedby.ai/tools/sierra.md) |
|---|---|---|
| Public customers | 39 | 50 |
| Confirmed | 19 | 37 |
| Observed | 20 | 13 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | Automotive Manufacturing (2), HR & Recruiting (2), IT Services & System Integration (2) | Fintech & Payments (5), Telecommunications (3), Banking & Mortgages (2) |
| Category | Customer Service Automation | Customer Service Automation |
| Integrations | Salesforce ([callminer.com](https://callminer.com/products/integrations), checked 2026-10-08) | — |
| Data processing terms | — | A data processing agreement is available. ([sierra.ai](https://sierra.ai/privacy-policy), checked 2026-10-04) |

## Companies named on both

Confirmed or observed on each side. The first public proof is not an adoption date.

| Company | First public proof, Sierra |
|---|---|
| [Santander](https://www.usedby.ai/companies/santander.md) | On or before August 2026 |
| [CarMax](https://www.usedby.ai/companies/carmax.md) | On or before August 2026 |
| [SiriusXM](https://www.usedby.ai/companies/siriusxm.md) | On or before February 2024 |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Sierra: [RunBuggy](https://www.usedby.ai/case-studies/runbuggy-sierra.md): **1,000 hours**: “Nearly 1,000 hours per month returned to exception handling and high-value work” (published 2026-02-03)
- Sierra: [Next](https://www.usedby.ai/case-studies/next-sierra.md): **6 weeks**: “Time to live 6 weeks” (published 2026-02-25)

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Source: https://www.usedby.ai/compare/callminer-vs-sierra · How we check: https://www.usedby.ai/methodology