Harvey vs Spellbook: who uses which
Customers, public proof and the companies that use both.
On usedby, 235 companies use Harvey and 27 use Spellbook. 2 companies use both, including Herzog Fox & Neeman and KMSC Law LLP. Harvey leads among the Legal & Compliance companies on usedby that use either tool.Latest check Oct 8, 2026: 232 of 262 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, Spellbook, or both
Every company with a public proof for at least one of the two tools.
233
use only Harvey
2
companies use both
25
use only Spellbook
233 companies use only Harvey, 25 use only Spellbook and 2 use both, out of the 260 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 8, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Harvey |
|---|---|
 Herzog Fox & Neeman | On or before Feb 2026 |
 KMSC Law LLP | — |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Harvey, Spellbook or both: a share of the companies on usedby, not of the market.
Harvey onlyBothSpellbook only
More common with Harvey
- Legal & Compliance139 of the 139 Legal & Compliance companies on usedby that use either tool use Harvey, 2 of them alongside Spellbook.
- Investment & VC12 of the 13 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
SpellbookWhat 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
Spellbook
Spellbook probably helps me bill an extra hour a day. Maybe more.
KMSC Law LLP
Vendor case study, spellbook.com, captured Oct 8, 2026
How Elevare Law uses Spellbook
Elevare Law
Vendor case study, spellbook.com, captured Oct 8, 2026
Questions about Harvey and Spellbook
Which is used more, Harvey or Spellbook?
Harvey has more customers on usedby: 235 against 27 for Spellbook.
Do companies use both Harvey and Spellbook?
Yes. 2 companies use both on usedby, including Herzog Fox & Neeman and KMSC Law LLP.
Who uses Harvey?
235 companies on usedby, each with the public page that shows it. See who uses Harvey.
Who uses Spellbook?
27 companies on usedby, each with the public page that shows it. See who uses Spellbook.
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.