Luminance vs Spellbook: who uses which
Customers, public proof and the companies that use both.
On usedby, 29 companies use Luminance and 27 use Spellbook. 1 company uses both, including LG.Latest check Oct 8, 2026: 56 of 56 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 Luminance, Spellbook, or both
Every company with a public proof for at least one of the two tools.
28
use only Luminance
1
company uses both
26
use only Spellbook
28 companies use only Luminance, 26 use only Spellbook and 1 uses both, out of the 55 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.
| Company |
|---|
 LG |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Luminance
SpellbookWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Luminance
40% time-savings on administrative tasks per week
ProSapient
Vendor case study, luminance.com, captured Oct 7, 2026
reduced the time spent on reviews by over 30% per contract
LG Chem
Vendor case study, luminance.com, captured Oct 7, 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 Luminance and Spellbook
Which is used more, Luminance or Spellbook?
Luminance has more customers on usedby: 29 against 27 for Spellbook.
Do companies use both Luminance and Spellbook?
Yes. 1 company uses both on usedby, including LG.
Who uses Luminance?
29 companies on usedby, each with the public page that shows it. See who uses Luminance.
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.