# Sierra vs Zendesk AI: who uses which

On usedby, 50 companies use Sierra and 27 use Zendesk AI. 1 company uses both, including Discord. 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: 73 of 77 public lines checked.

## Side by side

|  | [Sierra](https://www.usedby.ai/tools/sierra.md) | [Zendesk AI](https://www.usedby.ai/tools/zendesk-ai.md) |
|---|---|---|
| Public customers | 50 | 27 |
| Confirmed | 37 | 14 |
| Observed | 13 | 12 |
| Signals (job posts) | 0 | 1 |
| Top industries of customers | Fintech & Payments (5), Telecommunications (3), Banking & Mortgages (2) | DevTools & Infrastructure (4), Travel & Hospitality (3), E-commerce & D2C (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) | A data processing agreement is available. ([zendesk.com](https://www.zendesk.com/trust-center/), checked 2026-10-07) |
| Free trial | — | Free trial or free plan available. ([zendesk.com](https://www.zendesk.com/pricing/), checked 2026-10-07) |
| Integrations | — | Shopify, Microsoft Teams, Pipedrive, Klaviyo, GIPHY ([zendesk.com](https://www.zendesk.com/marketplace/), checked 2026-10-07) |

## Companies named on both

Confirmed or observed on each side.

| Company |
|---|
| [Discord](https://www.usedby.ai/companies/discord.md) |

## 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)
- Zendesk AI: [IRC-CEO](https://www.usedby.ai/case-studies/irc-ceo-zendesk-ai.md): **56 percent**: “a reduction by more than 56 percent” (published 2026-03-09)
- Zendesk AI: [Babbel](https://www.usedby.ai/case-studies/babbel-zendesk-ai.md): **50 percent**: “more than 50 percent of Babbel’s tickets are automated through AI agents” (published 2026-02-11)

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