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Who uses Customer.io?

Customer messaging platform with automated journeys and AI-assisted campaign workflows.

On usedby, 35 companies use Customer.io, including Buffer, Cosentino's Food Group, and Georgia Aquarium. 15 of them are confirmed by a published case study, quote or press release. 2 of them declared it to usedby themselves. The largest group: Artificial Intelligence companies with up to 200 employees (6 companies). Every company links to the public page that names it.

20 public sources+2 in the last 30 days
See the 35 companiesComparecustomer.io
CompareVisit customer.io
Customers

35 companies, each with its public proof

Strongest proof first. Open a company to see the page that names it, and when we captured it.

Companies that use Customer.io, with proof level, first public proof and source
CompanyIndustryProofFirst public proofSource
BufferMarketing TechConfirmed—customer.io
Cosentino's Food Group—Confirmed—customer.io
Georgia Aquarium—Confirmed—customer.io
GuestReadyTravel & HospitalityConfirmed—customer.io
Kinnect.Club—Confirmed—customer.io
Klar—Confirmed—customer.io
Livestorm—Confirmed—customer.io
Monarch—Confirmed—customer.io
Nordnet—Confirmed—customer.io
NotionWorkplace SoftwareConfirmed—customer.io
One Horizon—Confirmed—customer.io
Showrilly—Confirmed—customer.io
Takenos—Confirmed—customer.io
Tigres UANLSports & FitnessConfirmed—customer.io
VibeAdvertising & AdTechConfirmed—customer.io
CapacityArtificial IntelligenceDeclared—trust.capacity.com
Read AIArtificial IntelligenceDeclared—trust.read.ai
MixpanelData & AnalyticsObserved—customer.io
SegmentData & AnalyticsObserved—customer.io
AffirmFintech & PaymentsObserved—customer.io
AngiMarketplaceObserved—customer.io
ClearbitSales Tech & CRMObserved—customer.io
CleoFintech & PaymentsObserved—customer.io
CursorDevTools & InfrastructureObserved—customer.io
GammaArtificial IntelligenceObserved—customer.io
HiggsfieldArtificial IntelligenceObserved—customer.io
IFTTT—Observed—customer.io
Impremis Marketing—Observed—customer.io
LemonadeInsurance & InsurTechObserved—customer.io
MailgunDevTools & InfrastructureObserved—customer.io
MapboxDevTools & InfrastructureObserved—customer.io
MidiHealthTech & Digital HealthObserved—customer.io
OpenRouterArtificial IntelligenceObserved—customer.io
QuillBot—Observed—customer.io
LovableArtificial IntelligenceObserved—customer.io
Showing 15 of 35.
Results

What customers say Customer.io changed

Figures and quotes as Customer.io and its customers published them, each tied to its source. We quote, we do not measure the result.

All 15 stories →
80%
Nudge onboarding survey completion and enrollment
“Gemini creates experience and message, and then delivers it back into Customer.io. Customer.io then delivers it as a push notification. So it just does hyper-personalization in a way that we didn't think we could do before.”
Omar AlvarezFounder, Kinnect.Club
Vendor case study · Read how Kinnect.Club uses Customer.io
“Customer.io gives us leverage. Two founders can run follow-up at the scale of a full growth team.”
Gijs van de NieuwegiessenCo-founder, One Horizon AI, One Horizon
Vendor case study · Read how One Horizon uses Customer.io
19-25%
Activation rate after onboarding journey launch
“We, like a lot of teams, don't have a ton of people, but we still manage to have a solid and strategic email touchpoint strategy because the product is simple to use and because the data is well integrated.”
Romain MarsalVP of Growth & Marketing, Vibe
Vendor case study · Read how Vibe uses Customer.io
50 to 60 percent
Open rates on broad campaigns
Nordnet
Read how Nordnet uses Customer.io
2,000%
Increase in monthly send volume (more than)
Georgia Aquarium
Read how Georgia Aquarium uses Customer.io
750,000
fan records unified into a single fan profile
Tigres UANL
Read how Tigres UANL uses Customer.io
64%
reduction in unsubscribe rate
GuestReady
Read how GuestReady uses Customer.io
99.8%
users landing in a lifecycle stage
Takenos
Read how Takenos uses Customer.io
15% to 48%
Email open rate
Cosentino's Food Group
Read how Cosentino's Food Group uses Customer.io
62.3%
Open rate of the "Stuck in draft" automation
Showrilly
Read how Showrilly uses Customer.io
14%
increase in first-transaction conversions
Klar
Read how Klar uses Customer.io
Read how Livestorm uses Customer.ioEach figure is the vendor’s or the customer’s claim, quoted with its label. Latest capture Nov 12, 2026.12 of Customer.io’s 15 stories shown.
Where it’s used

Is Customer.io used in companies like yours?

By industry

13 industries among 35 customers. Of the 16 with a known size, 50% have up to 200 employees.

By industry and company size
Customers of Customer.io by industry and company size
IndustryCustomers≤ 200201–1,000> 1,000Unknown
Artificial Intelligence66000
DevTools & Infrastructure30102

Employees per company. Every proof level counts, job posts included. A company with no stored size gets its own column, never counted as small.

Which Personalization & advertising tools companies use, by industry: Travel & Hospitality

Before you buy

What Customer.io does, and what to check

What Customer.io does

Customer messaging platform with automated journeys and AI-assisted campaign workflows.

Written by usedby from customer.io.

Security

  • SOC 2 Type II
  • HIPAA

Pricing and terms

Pricing
Essentials: from $100 per month / billed monthly; Premium: from $1,000 per month / billed yearly; Enterprise: contact sales
Data residency
US, EU
Data processing terms
A data processing agreement is available.

Read on customer.io, checked Nov 13, 2026

Questions to ask in your demo

  1. Which of your customers look like us, by industry and size?
  2. What does a pilot cost, and what decides the move to a full contract?
  3. Where is our data stored, who can access it, and is it used to train models?
  4. How does Customer.io work with the tools we already use?
Alternatives

Customer.io alternatives, by public customers

Same or competing category, from another vendor. Every proof level counts. A shared category alone does not establish the same functions or suitability for your task.

All Customer.io alternatives →
Personalization & advertising ranking →

Often used with Customer.io

Other categories found at the same companies. All proof levels are included, including job-post signals. This does not establish an integration or joint use.

  • NotionWorkspaces & project management7 companies in common
  • ClaudeAI assistants4 companies in common
  • HexData platforms & analytics4 companies in common
  • BasetenAI inference & GPU cloud3 companies in common
  • BrexFinance & accounting AI3 companies in common
  • CursorAI coding assistants & agents3 companies in common
FAQ

Questions about Customer.io

Who uses Customer.io?

35 companies use Customer.io (15 confirmed, 2 declared, 18 observed), including Buffer, Cosentino's Food Group, and Georgia Aquarium.

What results do companies report with Customer.io?

Companies that use Customer.io report these results in public case studies. Kinnect.Club: 80% of users who started the Nudge onboarding survey completed it and were enrolled in the monthly program (source: customer.io, checked November 12, 2026). Georgia Aquarium: monthly send volume increased by more than 2,000% (source: customer.io, checked November 12, 2026). Tigres UANL: Starting from 750,000 fan records accumulated across years of campaigns, ticketing, e-commerce, POS, and digital engagement (source: customer.io, checked November 12, 2026).

How much does Customer.io cost?

Customer.io lists these prices on its own website:

  • Essentials: $100
  • Premium: $1,000 per month, billed yearly
  • Enterprise: price on request

Source: customer.io, checked November 13, 2026.

Is Customer.io SOC 2 compliant?

Customer.io states on its own website that it holds SOC 2 Type II and HIPAA. Source: customer.io, checked November 13, 2026.

Where does Customer.io store customer data?

Customer.io lists these data hosting regions on its own website: US and EU. Source: customer.io, checked November 13, 2026.

Does Customer.io offer a data processing agreement (DPA)?

Yes: Customer.io states on its own website that a data processing agreement (DPA) is available to customers. Source: customer.io, checked November 13, 2026.

Which industries use Customer.io?

The industries with the most Customer.io customers are Artificial Intelligence (6) and DevTools & Infrastructure (3).

What are the alternatives to Customer.io?

Ranked by public customers (every proof level counts, job posts included), the top Customer.io alternatives are Movable Ink (66 customers, 0 shared), Bloomreach (56 customers, 0 shared), Optimove (50 customers, 0 shared), and Smartly (48 customers, 0 shared). See all Customer.io alternatives.

How does usedby know who uses Customer.io, and how current is it?

Each company here links to a public page that names it as a Customer.io customer, and each line shows its proof level. A company that declared Customer.io itself is marked Declared. The latest check ran on November 12, 2026. How usedby collects and checks its data.

Sources

Where this data comes from

Three proof levels

Confirmed · 15Case study, named quote or press release.
Declared · 2The company told usedby itself that it uses Customer.io, or lists it as a sub-processor on its own legal page.
Observed · 18Customer.io shows the company on its own pages.

Main sources

How we check →

Cite this page

UsedBy.ai (2026). Who uses Customer.io? 35 companies. Retrieved from https://www.usedby.ai/tools/customer-io, latest check November 12, 2026.