Bretton AI (formerly Greenlite) vs Unit21: who uses which
Customers, public proof and the companies that use both.
On usedby, 14 companies use Bretton AI (formerly Greenlite) and 40 use Unit21. 1 company uses both, including Gusto.Latest check Oct 7, 2026: 54 of 54 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 Bretton AI (formerly Greenlite), Unit21, or both
Every company with a public proof for at least one of the two tools.
13
use only Bretton AI (formerly Greenlite)
1
company uses both
39
use only Unit21
13 companies use only Bretton AI (formerly Greenlite), 39 use only Unit21 and 1 uses both, out of the 53 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 7, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Gusto |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Bretton AI (formerly Greenlite)
Unit21What customers report
Results as the vendor or the customer published them, with the source and the date.
Bretton AI (formerly Greenlite)
80% reduction in time to close monthly screening alerts volume
Fluz
Vendor case study, bretton.com, captured Oct 7, 2026
50% reduction in alert handling time
Sling Money
Vendor case study, bretton.com, captured Oct 7, 2026
Unit21
Audit-ready in 2 days rather than 2 weeks
Sila
Vendor case study, unit21.ai, captured Oct 7, 2026
each analyst now spends 50% less time on cases and filings
Metal Pay
Vendor case study, unit21.ai, captured Oct 7, 2026
Questions about Bretton AI (formerly Greenlite) and Unit21
Which is used more, Bretton AI (formerly Greenlite) or Unit21?
Unit21 has more customers on usedby: 40 against 14 for Bretton AI (formerly Greenlite).
Do companies use both Bretton AI (formerly Greenlite) and Unit21?
Yes. 1 company uses both on usedby, including Gusto.
Who uses Bretton AI (formerly Greenlite)?
14 companies on usedby, each with the public page that shows it. See who uses Bretton AI (formerly Greenlite).
Who uses Unit21?
40 companies on usedby, each with the public page that shows it. See who uses Unit21.
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.