Sierra vs Wonderful: who uses which
Customers, public proof and the companies that use both.
On usedby, 62 companies use Sierra and 39 use Wonderful. 1 company uses both, including Liberty Global. Sierra leads among the Fintech & Payments companies on usedby that use either tool.Latest check Nov 15, 2026: 101 of 101 public lines checked. Counts include every proof level, job-post signals included. A company on both tools counts at any proof level, and a job post on one side is marked as such.
Who uses Sierra, Wonderful, or both
Every company with a public proof for at least one of the two tools.
61
listed for Sierra only
1
company uses both
38
listed for Wonderful only
On usedby, 61 companies are listed for Sierra only, 38 are listed for Wonderful only and 1 uses both, out of the 100 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
Who uses both
Companies with a public line on both tools, at any proof level: the strongest proofs come first, and a job post is marked.
| Company | First public proof, Wonderful |
|---|---|
 Liberty Global | On or before Nov 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Sierra, Wonderful or both: a share of the companies on usedby, not of the market.
Listed for Sierra onlyBothListed for Wonderful only
More common with Sierra
- Fintech & Payments9 of the 9 Fintech & Payments companies on usedby that use either tool use Sierra.
- Telecommunications4 of the 6 Telecommunications companies on usedby that use either tool use Sierra, 1 of them alongside Wonderful.
- Marketplace3 of the 5 Marketplace companies on usedby that use either tool use Sierra.
Source: every usedby line, from confirmed proofs to job-post signals (the weakest proof level).
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Vendor facts checked: Sierra, 2 of 4; Wonderful, 0 of 4. Missing facts remain unverified, not absent features.
Sierra
WonderfulWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Sierra
adding roughly 70,000 calls a month
Philippine Airlines
Vendor case study, sierra.ai, published Oct 7, 2026
How The Cigna Group uses Sierra
The Cigna Group
Vendor case study, sierra.ai, published Nov 10, 2026
Wonderful
No reviewed story for Wonderful yet.
Capabilities for agents: Sierra
Documentation and operational tests are separate. A test covers only the stated task and operation.
Check documentation access for Sierra Agent SDKDocumentation: Unknown · Operational test: Not tested
Sierra — Official publisher
Interface: Unknown. Plan: Unknown. Version: Unknown.
Endpoint: Unknown
Authentication: Unknown; technical documentation requires a sign-in
Permissions: Unknown
Documented operations: Unknown
Manual setup: Obtain authorized access to Sierra developer documentation before selecting an interface or operation.
Limits: Unknown
Documented costs: Unknown
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Develop agents in your existing programming environment and software development lifecycle.
No operational test was run.
Still to verify: No public REST or MCP endpoint was verified. Protocol, SDK/API version, operations, authentication scopes, limits and costs remain unknown. A product description does not prove an externally callable or tested capability.
Questions about Sierra and Wonderful
Which is used more, Sierra or Wonderful?
Sierra has more customers on usedby: 62 against 39 for Wonderful.
Do companies use both Sierra and Wonderful?
Yes. 1 company uses both on usedby, including Liberty Global.
Who uses Sierra?
62 companies on usedby, each with the public page that shows it. See who uses Sierra.
Who uses Wonderful?
39 companies on usedby, each with the public page that shows it. See who uses Wonderful.
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 four proof levels: confirmed, declared by the company itself, observed or signal (a job post, the weakest). A company counts as using both tools when it has a line on each, at any level; the list shows the strongest proofs first and marks job posts.