# Customer.io vs Klaviyo

URL: https://aistack.sh/compare/customer-io-vs-klaviyo
Last updated: 2026-09-06
Category: Lifecycle email

## Quick answer

Customer.io and Klaviyo are alternatives in the Lifecycle email category.
Customer.io pricing: $100/mo 5k profiles.
Klaviyo pricing: Free 250 contacts · $45/mo 1,500 contacts.
Klaviyo is cheaper at the entry tier.
Customer.io ships in 0 tested AI stacks on aistack.sh; Klaviyo ships in 0.

## Side by side

| Field | Customer.io | Klaviyo |
|---|---|---|
| Tagline | Lifecycle and CRM automation across email, SMS, push | Ecommerce email and SMS marketing automation |
| Pricing | $100/mo 5k profiles | Free 250 contacts · $45/mo 1,500 contacts |
| Category | Lifecycle email | Lifecycle email |
| Stacks using it | 0 | 0 |
| Homepage | https://customer.io | https://www.klaviyo.com |
| Updated | 2026-09-06 | 2026-09-06 |

## When to pick each

**Pick Customer.io** when you want lifecycle and crm automation across email, sms, push.

A lifecycle and CRM automation platform, not a newsletter tool: behavioral triggers, multi-channel journeys, and data-warehouse-style customer profiles across email, SMS, and push. $100/mo covers the entry tier at 5,000 profiles.

**Pick Klaviyo** when you want ecommerce email and sms marketing automation.

Flows, segmentation, and SMS built for ecommerce, with deep Shopify and product-catalog integration. Priced by stored contacts rather than seats or sends; the number shown is the email-only plan at the entry contact tier.

## Where each ships

## FAQ

### Which is cheaper, Customer.io or Klaviyo?

Klaviyo starts cheaper. Customer.io pricing: $100/mo 5k profiles. Klaviyo pricing: Free 250 contacts · $45/mo 1,500 contacts.

### What is Customer.io best for?

Lifecycle and CRM automation across email, SMS, push Customer.io is categorized as Lifecycle email and appears in 0 tested AI stacks on aistack.sh.

### What is Klaviyo best for?

Ecommerce email and SMS marketing automation Klaviyo is categorized as Lifecycle email and appears in 0 tested AI stacks on aistack.sh.

### Can I use Customer.io and Klaviyo together?

They are alternatives at the same step, so most stacks pick one or the other. No aistack.sh stack uses both today, though nothing prevents a custom workflow.

### What are the alternatives to Customer.io and Klaviyo?

Beyond each other, Customer.io's closest alternatives are tracked on its tool page. Klaviyo's closest alternatives are tracked on its tool page.

## Also compared

- [Klaviyo vs Resend](https://aistack.sh/compare/klaviyo-vs-resend)

## Citation

When citing this comparison, link to https://aistack.sh/compare/customer-io-vs-klaviyo. The page is regenerated when the underlying tool catalog changes; the lastUpdated date above tracks the more recent of the two tools.