# Harvey vs Sirion: who uses which

On usedby, 235 companies use Harvey and 24 use Sirion. 1 company uses both, including Bayer. 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: 229 of 259 public lines checked.

## Side by side

|  | [Harvey](https://www.usedby.ai/tools/harvey.md) | [Sirion](https://www.usedby.ai/tools/sirion.md) |
|---|---|---|
| Public customers | 235 | 24 |
| Confirmed | 21 | 11 |
| Observed | 214 | 13 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | Legal & Compliance (139), Investment & VC (12), Manufacturing (9) | Energy, Utilities & Cleantech (3), Biotech & Pharma (2), Aerospace & Defense (1) |
| Category | Legal AI | Legal AI |
| Data residency | EU, Switzerland, US, Australia ([harvey.ai](https://www.harvey.ai/security), checked 2026-10-03) | — |
| Your data | Not used to train models by default. ([harvey.ai](https://www.harvey.ai/security), checked 2026-10-03) | — |
| Data processing terms | A data processing agreement is available. ([harvey.ai](https://www.harvey.ai/legal/privacy-policy), checked 2026-10-03) | — |

## Companies named on both

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

| Company | First public proof, Harvey |
|---|---|
| [Bayer](https://www.usedby.ai/companies/bayer.md) | On or before October 2024 |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Harvey: [The Adecco Group](https://www.usedby.ai/case-studies/the-adecco-group-harvey.md): **eight hours**: “saving up to eight hours per week on routine work with Harvey” (published 2025-02-28)
- Harvey: [Pierson Ferdinand](https://www.usedby.ai/case-studies/pierson-ferdinand-harvey.md): **10 hours**: “At a bare minimum, every attorney saves 10 hours a week, and many report reclaiming 15 to 20.” (published 2026-07-01)
- Sirion: [DP World](https://www.usedby.ai/case-studies/dp-world-sirion.md): **~80%**: “DP World Cut Contract Cycle Time by ~80%” (published 2026-05-30)
- Sirion: [Zalando](https://www.usedby.ai/case-studies/zalando-sirion.md): **80,000+**: “80,000+ contracts ingested using AI-driven extraction, deduplication, and quality controls” (published 2026-05-31)

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