Sardine vs Unit21: who uses which
Customers, public proof and the companies that use both.
On usedby, 32 companies use Sardine and 40 use Unit21. 3 companies use both, including Intuit, Gusto, and FIS. Sardine leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 8, 2026: 72 of 72 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 Sardine, Unit21, or both
Every company with a public proof for at least one of the two tools.
29
use only Sardine
3
companies use both
37
use only Unit21
29 companies use only Sardine, 37 use only Unit21 and 3 use both, out of the 69 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 8, 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 |
|---|
 Intuit |
 Gusto |
 FIS |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Sardine
Unit21What customers report
Results as the vendor or the customer published them, with the source and the date.
Sardine
Raise has cut chargebacks by 45%
RAISE
Vendor case study, sardine.ai, captured Oct 8, 2026
Asoview's in-house development team handled the integration and was live in under a month
Asoview
Vendor case study, sardine.ai, captured Oct 8, 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 Sardine and Unit21
Which is used more, Sardine or Unit21?
Unit21 has more customers on usedby: 40 against 32 for Sardine.
Do companies use both Sardine and Unit21?
Yes. 3 companies use both on usedby, including Intuit, Gusto, and FIS.
Who uses Sardine?
32 companies on usedby, each with the public page that shows it. See who uses Sardine.
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.