Level AI vs Sierra: who uses which
Customers, public proof and the companies that use both.
On usedby, 19 companies use Level AI and 50 use Sierra. 2 companies use both, including Wayfair and Chime. Sierra leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 8, 2026: 69 of 69 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 Level AI, Sierra, or both
Every company with a public proof for at least one of the two tools.
17
use only Level AI
2
companies use both
48
use only Sierra
17 companies use only Level AI, 48 use only Sierra and 2 use both, out of the 67 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
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Sierra |
|---|---|
 Wayfair | On or before Jun 2025 |
 Chime | On or before Dec 2025 |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Level AI
SierraWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Level AI
Globalfaces now enjoys a 75% conversion rate on verification calls
Globalfaces
Vendor case study, thelevel.ai, captured Oct 8, 2026
13% decrease in its overall call handling time
ezCater
Vendor case study, thelevel.ai, captured Oct 8, 2026
Sierra
Nearly 1,000 hours per month returned to exception handling and high-value work
RunBuggy
Vendor case study, sierra.ai, published Feb 3, 2026
Questions about Level AI and Sierra
Which is used more, Level AI or Sierra?
Sierra has more customers on usedby: 50 against 19 for Level AI.
Do companies use both Level AI and Sierra?
Yes. 2 companies use both on usedby, including Wayfair and Chime.
Who uses Level AI?
19 companies on usedby, each with the public page that shows it. See who uses Level AI.
Who uses Sierra?
50 companies on usedby, each with the public page that shows it. See who uses Sierra.
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.