Harvey vs Sirion: who uses which
Customers, public proof and the companies that use both.
On usedby, 235 companies use Harvey and 24 use Sirion. 1 company uses both, including Bayer. Harvey leads among the Legal & Compliance companies on usedby that use either tool.Latest check Oct 8, 2026: 229 of 259 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses Harvey, Sirion, or both
Every company with a public proof for at least one of the two tools.
234
use only Harvey
1
company uses both
23
use only Sirion
234 companies use only Harvey, 23 use only Sirion and 1 uses both, out of the 258 companies on usedby that use at least one of them.
Where it lands
Newest customers
Where it lands
Newest customers
No new customer since tracking started on October 7, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Harvey |
|---|---|
 Bayer | On or before Oct 2024 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Harvey, Sirion or both: a share of the companies on usedby, not of the market.
Harvey onlyBothSirion only
More common with Harvey
- Legal & Compliance139 of the 139 Legal & Compliance companies on usedby that use either tool use Harvey.
- Investment & VC12 of the 12 Investment & VC companies on usedby that use either tool use Harvey.
- Manufacturing9 of the 9 Manufacturing companies on usedby that use either tool use Harvey.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Harvey
SirionWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Harvey
saving up to eight hours per week on routine work with Harvey
The Adecco Group
Vendor case study, harvey.ai, published Feb 28, 2025
At a bare minimum, every attorney saves 10 hours a week, and many report reclaiming 15 to 20.
Pierson Ferdinand
Vendor case study, harvey.ai, published Jul 1, 2026
Sirion
DP World Cut Contract Cycle Time by ~80%
DP World
Vendor case study, sirion.ai, published May 30, 2026
80,000+ contracts ingested using AI-driven extraction, deduplication, and quality controls
Zalando
Vendor case study, sirion.ai, published May 31, 2026
Questions about Harvey and Sirion
Which is used more, Harvey or Sirion?
Harvey has more customers on usedby: 235 against 24 for Sirion.
Do companies use both Harvey and Sirion?
Yes. 1 company uses both on usedby, including Bayer.
Who uses Harvey?
235 companies on usedby, each with the public page that shows it. See who uses Harvey.
Who uses Sirion?
24 companies on usedby, each with the public page that shows it. See who uses Sirion.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.