vioscaleAI
Comparison

Customer.io vs Klaviyo

No clear leader: Customer.io (53.5) and Klaviyo (49.8) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Customer.io full profile →Klaviyo full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
Customer.io54
Klaviyo50
Score
vioscaleAI score
Customer.io54 / 100medium · 55%
Klaviyo50 / 100medium · 52%
Pricing
Free tier
Customer.io✗
Klaviyo✓
Model
Customer.iocommercial
Klaviyofreemium
Price level
Customer.iounknown
Klaviyolow
Transparent
Customer.io✗
Klaviyo✗
Integrations
Count
Customer.io11
Klaviyo3
Security
Certifications
Customer.ioSOC 2 Type II
Klaviyo–
Disclosure policy
Customer.io✓
Klaviyo–
Gdpr
Customer.io✓
Klaviyo✓
Hipaa
Customer.io✓
Klaviyo–
Iso27001
Customer.io✓
Klaviyo–
Soc2
Customer.io✓
Klaviyo–
Trust center
Reliability
Status page
Customer.io✓
Klaviyo✓
Market
Availability
Content
Faq
Customer.io7 items
Klaviyo7 items

Capabilities

Feature-by-feature on the axes that matter for marketing automation software. “-” means undocumented, not absent.

Pricing
Transparent published pricing
Customer.io✗
Klaviyo✗
Free tier
Customer.io✗
Klaviyo✓
Pricing unit
Customer.io-
Klaviyo-
Orchestration
Visual journey / workflow builder
Customer.io✓
Klaviyo✓
Lead management
Lead scoring
Customer.io✗
Klaviyo-
Channels
Multichannel beyond email
Customer.io✓
Klaviyo✓
Web / on-site personalisation
Customer.io✓
Klaviyo✓
Ads audience sync
Customer.io✓
Klaviyo-
Integrations
Native CRM sync
Customer.io✓
Klaviyo-
Data
Built-in CDP / event data
Customer.io✓
Klaviyo✓
Optimisation
A/B / multivariate testing
Customer.io✓
Klaviyo✓
Segment
Lifecycle focus
Customer.ioBoth
KlaviyoB2C
Deployment
Self-hostable
Customer.io✗
Klaviyo✗
AI
AI (send-time / content / predictive)
Customer.io✓
Klaviyo✓

What each one is

The product in its own terms, so the numbers below have context.

Customer.io

An AI-driven platform that automates customer communications across email, SMS, push, in-app messaging, and other channels based on customer behavior and data. It enables teams to build visual customer journeys, segment audiences, and analyze engagement performance.

Independently observed

Klaviyo

A unified customer relationship management system that aggregates customer data and automates personalized campaigns across email, SMS, WhatsApp, and other channels. It combines customer data aggregation, real-time signals, and AI agents to enable intelligent, cross-channel customer engagement at scale.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Customer.io

from $100/moSubscription14-day trial

From $100/month. 14-day free trial; 12-month free for qualifying startups.

  • Essentials$100/month, billed monthly
    • 5k profiles (people + objects)
    • AI Agent with core execution skills
    • 1 million emails per month
    • 2 object types
    • Visual workflow builder
    • +3 more
  • Premium$1,000/month, billed annually
    • Everything in Essentials
    • Custom profile volume & pricing
    • Custom email volume & pricing
    • 10 object types
    • Elevated Agent limits + custom skills
    • +5 more
  • EnterpriseContact sales
    • Everything in Premium
    • Custom pricing on profile & email volume
    • Custom Agent limits + execution skills
    • Priority technical support
    • Migration support
    • +6 more
as of verify ↗

Klaviyo

SubscriptionFree tier

Free plan available. Paid tiers with promotional pricing available.

  • FreeFree
    • Up to 250 profiles
    • 500 emails/month
    • $5 of mobile messages/month
    • 10,000 Composer credits
    • Built-in reporting
    • +3 more
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Customer.io✓
Klaviyo✓
iOS
Customer.io✓
Klaviyo✗
Android
Customer.io✓
Klaviyo✗
CLI
Customer.io✓
Klaviyo✗
Deployment
Cloud / SaaS
Customer.io✓
Klaviyo✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (1)
  • Shopify

Customer.io

16 total - 15 not shared
  • Salesforce
  • Meta Ads
  • Facebook Ads
  • Instagram Ads
  • Google Ads
  • YouTube Ads
  • HubSpot
  • Google Sheets
  • Slack
  • Snowflake
  • Google BigQuery
  • Mixpanel
  • WhatsApp
  • RudderStack
  • Segment
Independently observed

Klaviyo

6 total - 5 not shared
  • Figma
  • Instagram
  • Claude
  • ChatGPT
  • Yotpo
Independently observed
Still deciding?

Customer.io or Klaviyo: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.