# Kustomer vs Sierra: who uses which

On usedby, 32 companies use Kustomer 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: 82 of 82 public lines checked.

## Side by side

|  | [Kustomer](https://www.usedby.ai/tools/kustomer.md) | [Sierra](https://www.usedby.ai/tools/sierra.md) |
|---|---|---|
| Public customers | 32 | 50 |
| Confirmed | 27 | 37 |
| Observed | 5 | 13 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | E-commerce & D2C (9), Fashion & Apparel (6), Travel & Hospitality (2) | Fintech & Payments (5), Telecommunications (3), Banking & Mortgages (2) |
| Category | Customer Service Automation | Customer Service Automation |
| Data processing terms | A data processing agreement is available. ([kustomer.com](https://www.kustomer.com/privacy/), checked 2026-10-07) | A data processing agreement is available. ([sierra.ai](https://sierra.ai/privacy-policy), checked 2026-10-04) |
| Integrations | 8x8, Acuity Scheduling, Ada, AfterShip, Aircall, Amazon Connect, Amazon Redshift, AskNicely, Assembled, Attentive, Babelforce, BigCommerce ([kustomer.com](https://www.kustomer.com/integrations/), checked 2026-10-07) | — |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Kustomer: [MeUndies](https://www.usedby.ai/case-studies/meundies-kustomer.md): **66%**: “chat grew from 36% to 66% of all inbound volume in under 9 months” (captured by usedby 2026-10-03)
- Kustomer: [Coterie Baby](https://www.usedby.ai/case-studies/coterie-baby-kustomer.md): story without a checked figure. (captured by usedby 2026-10-03)
- 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/kustomer-vs-sierra · How we check: https://www.usedby.ai/methodology