Duckle vs Sierra: who uses which
Customers, public proof and the companies that use both.
On usedby, 21 companies use Duckle and 50 use Sierra. 1 company uses both, including Discord. Sierra leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 7, 2026: 67 of 71 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 Duckle, Sierra, or both
Every company with a public proof for at least one of the two tools.
20
use only Duckle
1
company uses both
49
use only Sierra
20 companies use only Duckle, 49 use only Sierra and 1 uses both, out of the 70 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 4, 2026.
Where it lands
Newest customers
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.
Duckle
SierraWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Duckle
66% reduction in support cost
Abbiamo
Vendor case study, duckie.ai, captured Oct 4, 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 Duckle and Sierra
Which is used more, Duckle or Sierra?
Sierra has more customers on usedby: 50 against 21 for Duckle.
Do companies use both Duckle and Sierra?
Yes. 1 company uses both on usedby, including Discord.
Who uses Duckle?
21 companies on usedby, each with the public page that shows it. See who uses Duckle.
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.