# Cresta vs Sierra: who uses which

On usedby, 18 companies use Cresta and 50 use Sierra. No company is listed with both yet. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side. Latest check 2026-10-07: 68 of 68 public lines checked.

## Side by side

|  | [Cresta](https://www.usedby.ai/tools/cresta.md) | [Sierra](https://www.usedby.ai/tools/sierra.md) |
|---|---|---|
| Public customers | 18 | 50 |
| Confirmed | 15 | 37 |
| Observed | 3 | 13 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | Airlines & Aviation Services (2), Automotive Manufacturing (1), Fintech & Payments (1) | Fintech & Payments (5), Telecommunications (3), Banking & Mortgages (2) |
| Category | Customer Service Automation | Customer Service Automation |
| Data processing terms | — | A data processing agreement is available. ([sierra.ai](https://sierra.ai/privacy-policy), checked 2026-10-04) |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Cresta: [Aptive](https://www.usedby.ai/case-studies/aptive-environmental-cresta.md): **$2.37 million**: “$2.37 million in additional annual revenue in the 2 years since deploying Cresta” (captured by usedby 2026-10-07)
- Cresta: [Vivint](https://www.usedby.ai/case-studies/vivint-cresta.md): **7%**: “In an Agent Assist pilot program, Vivint agents increased their closed won rate by nearly 7%.” (captured by usedby 2026-10-07)
- 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/cresta-vs-sierra · How we check: https://www.usedby.ai/methodology