# Kustomer vs Siena AI: who uses which
On usedby, 32 companies use Kustomer and 36 use Siena AI. 4 companies use both, including Coterie Baby, Goody and Hexclad. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-27: 68 of 68 public lines checked.
## Side by side
| | [Kustomer](https://www.usedby.ai/tools/kustomer.md) | [Siena AI](https://www.usedby.ai/tools/siena-ai.md) |
|---|---|---|
| Public customers | 32 | 36 |
| Confirmed | 23 | 18 |
| Observed | 9 | 18 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers (every proof level) | E-commerce & D2C (10), Fashion & Apparel (8), Consumer Goods (2) | E-commerce & D2C (6), Fashion & Apparel (6), Beauty & Cosmetics (3) |
| Category | Help desks | AI agents for customer service |
| Data processing terms | A data processing agreement is available. ([kustomer.com](https://www.kustomer.com/privacy/), checked 2026-10-22) | — |
| Integrations | 8x8, Acuity Scheduling, Ada, AfterShip, Aircall, Amazon Connect, Amazon Redshift, AskNicely, Assembled, Attentive, Babelforce, BigCommerce ([kustomer.com](https://www.kustomer.com/integrations/), checked 2026-10-22) | — |
## Companies that use both
Every proof level counts; the proof level of each side is shown, strongest proofs first. The first public proof is not an adoption date.
| Company | Proof, Kustomer | Proof, Siena AI | First public proof, Kustomer |
|---|---|---|---|
| [Coterie Baby](https://www.usedby.ai/companies/coterie-baby.md) | Confirmed | Confirmed | On or before March 2026 |
| [Goody](https://www.usedby.ai/companies/goody.md) | Confirmed | Confirmed | On or before January 2026 |
| [Hexclad](https://www.usedby.ai/companies/hexclad.md) | Confirmed | Confirmed | On or before November 2024 |
| [Terra Kaffe](https://www.usedby.ai/companies/terra-kaffe.md) | Confirmed | Confirmed | On or before April 2025 |
## Published results
Reviewed stories only; usedby did not measure the figures.
- Kustomer: [Hexclad](https://www.usedby.ai/case-studies/hexclad-kustomer.md): **21%**: “the lifetime value of a customer, who interacts with our support team, is roughly 21% higher” (captured by usedby 2026-10-09)
- Kustomer: [UNTUCKit](https://www.usedby.ai/case-studies/untuckit-kustomer.md): **30 seconds**: “Putting all the necessary customer info in front of agents helped them decrease voice handle times by 30 seconds.” (captured by usedby 2026-10-09)
- Siena AI: [Canopy](https://www.usedby.ai/case-studies/canopy-siena-ai.md): **36%**: “Automating over 36% of incoming queries across various channels” (published 2024-04-29)
- Siena AI: [Goody](https://www.usedby.ai/case-studies/goody-siena-ai.md): **42%**: “Siena can handle 42% of customer conversations” (published 2025-03-18)
## Evidence for your decision: Kustomer
Source observations. Check the required plan and conditions before choosing.
### Documented tasks
- Everlane — Resolve 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.
[Source]() · VENDOR CASE STUDY · Captured: 2026-10-09T22:14:39.328Z
- Bulletproof — Resolve 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.
[Source]() · VENDOR CASE STUDY · Captured: 2026-10-09T22:18:31.019Z
### Choice criteria
- Integration: 8x8 — Sourced observation
Plan: Unknown · Checked: 2026-10-22T09:38:27.694Z
> Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
[Source]() · Vendor page
- Integration: Acuity Scheduling — Sourced observation
Plan: Unknown · Checked: 2026-10-22T09:38:27.694Z
> Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
[Source]() · Vendor page
- Integration: Ada — Sourced observation
Plan: Unknown · Checked: 2026-10-22T09:38:27.694Z
> Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
[Source]() · Vendor page
- Integration: AfterShip — Sourced observation
Plan: Unknown · Checked: 2026-10-22T09:38:27.694Z
> Voice 8x8 Learn More Productivity Acuity Scheduling Learn More Chatbots + AI Ada Learn More Productivity AfterShip
[Source]() · Vendor page
## Capabilities for agents: Kustomer
Documentation and operational tests are separate. A test covers only the stated task and operation.
### Kustomer API — List customers belonging to a Kustomer organization
Documentation: documented. Operational test: not_tested.
Publisher: Kustomer (official).
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
Documentation checked: 2026-10-22T10:43:28.807756Z
> Retrieves all customers in your organization.
Source: https://developer.kustomer.com/kustomer-api-docs/reference/getcustomers
> org.permission.customer.read
Source: https://developer.kustomer.com/kustomer-api-docs/reference/getcustomers
> Bearer
Source: https://developer.kustomer.com/kustomer-api-docs/reference/getcustomers
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.
---
Source: https://www.usedby.ai/compare/kustomer-vs-siena-ai · How we check: https://www.usedby.ai/methodology