Sierra vs Zendesk AI: who uses which
Customers, public proof and the companies that use both.
On usedby, 50 companies use Sierra and 27 use Zendesk AI. 1 company uses both, including Discord. Sierra leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 7, 2026: 73 of 77 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 Sierra, Zendesk AI, or both
Every company with a public proof for at least one of the two tools.
49
use only Sierra
1
company uses both
26
use only Zendesk AI
49 companies use only Sierra, 26 use only Zendesk AI and 1 uses both, out of the 76 companies on usedby that use at least one of them.
Where it lands
Newest customers
Where it lands
Newest customers
No new customer since tracking started on October 3, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Discord |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Sierra
Zendesk AIWhat customers report
Results as the vendor or the customer published them, with the source and the date.
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
Zendesk AI
a reduction by more than 56 percent
IRC-CEO
Vendor case study, zendesk.com, published Mar 9, 2026
more than 50 percent of Babbel’s tickets are automated through AI agents
Babbel
Vendor case study, zendesk.com, published Feb 11, 2026
Questions about Sierra and Zendesk AI
Which is used more, Sierra or Zendesk AI?
Sierra has more customers on usedby: 50 against 27 for Zendesk AI.
Do companies use both Sierra and Zendesk AI?
Yes. 1 company uses both on usedby, including Discord.
Who uses Sierra?
50 companies on usedby, each with the public page that shows it. See who uses Sierra.
Who uses Zendesk AI?
27 companies on usedby, each with the public page that shows it. See who uses Zendesk AI.
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.