Decagon vs Sierra: who uses which
Customers, public proof and the companies that use both.
On usedby, 43 companies use Decagon and 50 use Sierra. 2 companies use both, including Chime and Fanatics. Decagon leads among the DevTools & Infrastructure companies on usedby that use either tool, Sierra among the Fintech & Payments companies.Latest check Oct 7, 2026: 93 of 93 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 Decagon, Sierra, or both
Every company with a public proof for at least one of the two tools.
41
use only Decagon
2
companies use both
48
use only Sierra
41 companies use only Decagon, 48 use only Sierra and 2 use both, out of the 91 companies on usedby that use at least one of them.
Where it lands
Newest customers
We have not started tracking changes for Decagon yet.
Where it lands
Newest customers
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Sierra |
|---|---|
 Chime | On or before Dec 2025 |
 Fanatics | On or before Jul 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Decagon, Sierra or both: a share of the companies on usedby, not of the market.
Decagon onlyBothSierra only
More common with Decagon
- DevTools & Infrastructure3 of the 5 DevTools & Infrastructure companies on usedby that use either tool use Decagon.
More common with Sierra
- Fintech & Payments5 of the 8 Fintech & Payments companies on usedby that use either tool use Sierra, 1 of them alongside Decagon.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
DecagonSierraWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Decagon
Avoided the need to hire over 35 additional agents while managing growing inquiry volumes
NG.CASH
Vendor case study, decagon.ai, published Jul 28, 2026
ticket resolution time improved up to 34%
Notion
Vendor case study, decagon.ai, published Jul 28, 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 Decagon and Sierra
Which is used more, Decagon or Sierra?
Sierra has more customers on usedby: 50 against 43 for Decagon. Decagon leads among the DevTools & Infrastructure companies on usedby that use either tool, Sierra among the Fintech & Payments companies.
Do companies use both Decagon and Sierra?
Yes. 2 companies use both on usedby, including Chime and Fanatics.
Who uses Decagon?
43 companies on usedby, each with the public page that shows it. See who uses Decagon.
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.