Sirion vs Spellbook: who uses which
Customers, public proof and the companies that use both.
On usedby, 24 companies use Sirion and 27 use Spellbook. No company is listed with both yet.Latest check Oct 8, 2026: 51 of 51 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 Sirion, Spellbook, or both
Every company with a public proof for at least one of the two tools.
24
use only Sirion
0
companies use both
27
use only Spellbook
24 companies use only Sirion, 27 use only Spellbook and 0 use both, out of the 51 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 7, 2026.
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.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Sirion
SpellbookWhat customers report
Results as the vendor or the customer published them, with the source and the date.
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
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 Sirion and Spellbook
Which is used more, Sirion or Spellbook?
Spellbook has more customers on usedby: 27 against 24 for Sirion.
Do companies use both Sirion and Spellbook?
usedby has not found a company with a confirmed or observed line on both Sirion and Spellbook yet.
Who uses Sirion?
24 companies on usedby, each with the public page that shows it. See who uses Sirion.
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.