Kustomer vs Siena AI: who uses which
Customers, public proof and the companies that use both.
On usedby, 32 companies use Kustomer and 36 use Siena AI. 4 companies use both, including Coterie Baby, Goody, and Hexclad. Kustomer leads among the Fashion & Apparel companies on usedby that use either tool.Latest check Oct 27, 2026: 68 of 68 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 Kustomer, Siena AI, or both
Every company with a public proof for at least one of the two tools.
28
listed for Kustomer only
4
companies use both
32
listed for Siena AI only
On usedby, 28 companies are listed for Kustomer only, 32 are listed for Siena AI only and 4 use both, out of the 64 companies listed for at least one. An absent listing does not prove non-use.
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, Kustomer |
|---|---|
 Coterie Baby | On or before Mar 2026 |
 Goody | On or before Jan 2026 |
 Hexclad | On or before Nov 2024 |
 Terra Kaffe | On or before Apr 2025 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Kustomer, Siena AI or both: a share of the companies on usedby, not of the market.
Listed for Kustomer onlyBothListed for Siena AI only
More common with Kustomer
- Fashion & Apparel8 of the 14 Fashion & Apparel companies on usedby that use either tool use Kustomer.
- E-commerce & D2C10 of the 13 E-commerce & D2C companies on usedby that use either tool use Kustomer, 3 of them alongside Siena AI.
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.
Kustomer
Siena AIWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Kustomer
the lifetime value of a customer, who interacts with our support team, is roughly 21% higher
Hexclad
Vendor case study, kustomer.com, captured Oct 9, 2026
Putting all the necessary customer info in front of agents helped them decrease voice handle times by 30 seconds.
UNTUCKit
Vendor case study, kustomer.com, captured Oct 9, 2026
Siena AI
Automating over 36% of incoming queries across various channels
Canopy
Vendor case study, siena.cx, published Apr 29, 2024
Siena can handle 42% of customer conversations
Goody
Vendor case study, siena.cx, published Mar 18, 2025
Evidence for your decision: Kustomer
Source observations. Check the required plan and conditions before choosing.
Documented tasks
EverlaneResolve customer support requests
Everlane is also leveraging AI from Kustomer to automate its live chat service and remove the more simplistic and straight forward customer inquiries from requiring live agent support.
BulletproofResolve customer support requests
Bulletproof uses Kustomer’s custom workflows to automate the resolution of common transactional problems for customers without the help of their development team.
Choice criteria
Integration: 8x8Sourced observation
Plan: Unknown
Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
Integration: Acuity SchedulingSourced observation
Plan: Unknown
Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
Integration: AdaSourced observation
Plan: Unknown
Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
Integration: AfterShipSourced observation
Plan: Unknown
Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
Capabilities for agents: Kustomer
Documentation and operational tests are separate. A test covers only the stated task and operation.
List customers belonging to a Kustomer organizationDocumentation: Documented · Operational test: Not tested
Kustomer — Official publisher
Interface: REST. Plan: Unknown. Version: v1.
Endpoint: https://api.kustomerapp.com/v1/customers
Authentication: API token in Authorization header with Bearer prefix
Permissions: org.permission.customer.read
Documented operations: list_customers (Read)
Manual setup: An admin creates an API key in Settings > Security > API Keys. Choose an appropriate API role and keep the key private.
Limits: Request limits vary by pricing tier; no numeric limit is established for this profile.
Documented costs: Unknown
Retrieves all customers in your organization.
org.permission.customer.read
Bearer
No operational test was run.
Still to verify: The exact authorized organization hostname, plan entitlement, request quota and API cost were not verified. No customer data was requested.
Questions about Kustomer and Siena AI
Which is used more, Kustomer or Siena AI?
Siena AI has more customers on usedby: 36 against 32 for Kustomer.
Do companies use both Kustomer and Siena AI?
Yes. 4 companies use both on usedby, including Coterie Baby, Goody, and Hexclad.
Who uses Kustomer?
32 companies on usedby, each with the public page that shows it. See who uses Kustomer.
Who uses Siena AI?
36 companies on usedby, each with the public page that shows it. See who uses Siena 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 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.