# Ironclad vs Sirion: who uses which

On usedby, 58 companies use Ironclad and 24 use Sirion. 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: 77 of 82 public lines checked.

## Side by side

|  | [Ironclad](https://www.usedby.ai/tools/ironclad.md) | [Sirion](https://www.usedby.ai/tools/sirion.md) |
|---|---|---|
| Public customers | 58 | 24 |
| Confirmed | 33 | 11 |
| Observed | 19 | 13 |
| Signals (job posts) | 6 | 0 |
| Top industries of customers | DevTools & Infrastructure (7), Sales Tech & CRM (5), Media & Publishing (4) | Energy, Utilities & Cleantech (3), Biotech & Pharma (2), Aerospace & Defense (1) |
| Category | Legal AI | Legal AI |
| Data processing terms | A data processing agreement is available. ([ironcladapp.com](https://ironcladapp.com/security), checked 2026-10-03) | — |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Ironclad: [Vinted](https://www.usedby.ai/case-studies/vinted-ironclad.md): **120 users**: “120 users across 12 workflows” (published 2025-09-23)
- Ironclad: [Vontier](https://www.usedby.ai/case-studies/vontier-ironclad.md): **3-5 days**: “Now for complex agreements, “It’s more like 3-5 days.”” (published 2026-01-05)
- 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/ironclad-vs-sirion · How we check: https://www.usedby.ai/methodology