Customer.io 
Klaviyo Customer.io vs Klaviyo
A side-by-side Customer Engagement Platform comparison of Customer.io and Klaviyo — capability coverage, pricing, and which fits your stack. No referral fees; the data is ours.
Capability comparison
| Capability | Customer.io | Klaviyo |
|---|---|---|
| Audience Segmentation | Core | Core |
| Campaign Management | Core | Core |
| Email Delivery | Core | Core |
| Event Stream Ingestion | Core | Supported |
| Form Capture & Progressive Profiling | — | Core |
| In-app Messaging | Core | — |
| Journey Orchestration | Core | Core |
| Marketing Email | — | Core |
| Multi-channel Messaging | Core | Core |
| Predictive Scoring / Propensity | — | Core |
| SMS / MMS | Core | Core |
| Transactional Email | Core | — |
| Trigger-based Automation | Core | — |
| Customer Lifetime Value (CLV) | — | Supported |
| Mobile SDK | Supported | — |
| Product Recommendations | — | Supported |
| Push Notifications | Supported | Supported |
| Web SDK | — | Supported |
Choose Customer.io if…
- You need In-app Messaging (core capability Klaviyo doesn't lead with)
- You need Transactional Email (core capability Klaviyo doesn't lead with)
- You need Event Stream Ingestion (core capability Klaviyo doesn't lead with)
- You need Trigger-based Automation (core capability Klaviyo doesn't lead with)
Pricing: Usage-based
Choose Klaviyo if…
- You need Marketing Email (core capability Customer.io doesn't lead with)
- You need Predictive Scoring / Propensity (core capability Customer.io doesn't lead with)
- You need Form Capture & Progressive Profiling (core capability Customer.io doesn't lead with)
Pricing: Usage-based
Customer.io vs Klaviyo — FAQ
What is the difference between Customer.io and Klaviyo?
Both are Customer Engagement Platform tools. Customer.io leans into In-app Messaging and Transactional Email, while Klaviyo is stronger on Marketing Email and Predictive Scoring / Propensity. The capability matrix above shows the full side-by-side.
Is Customer.io or Klaviyo better?
Neither is universally better — it depends on your stack. Choose Customer.io if you need In-app Messaging; choose Klaviyo if Marketing Email matter more. Map both against your actual requirements rather than a generic feature count.
How do Customer.io and Klaviyo compare on price?
Customer.io: Usage-based. Klaviyo: Usage-based. Check each vendor's page for current rates.
Customer.io or Klaviyo? Decide in your stack's context.
Drop both onto a canvas, see how each integrates with what you already run, and score them against your real requirements — not a generic feature list.
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