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Klaviyo vs Retain AI

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Free plan
Both — Klaviyo has a free plan, Retain AI is free to use
Public API
Klaviyo has one; not confirmed by us for Retain AI
Best fit
Klaviyo: E-commerce brands on Shopify, WooCommerce or similar with real order data to segment on · Retain AI: Shopify merchants wanting automated win-back email without writing copy
Trust score
About even — Klaviyo 94, Retain AI 92
Status
Both up at our last check — Klaviyo Sep 6, 2026, Retain AI Oct 14, 2026

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

KlaviyoEmail and SMS marketing with predictive segmentationRetain AIFree Shopify app that auto-generates and sends AI winback emails to past customers based on purchase history.

Side by side

FactKlaviyoRetain AI
CategoryEmail Marketing & NewslettersEmail Marketing & Newsletters
Pricing modelFreemiumFree
Starts at$20/mo—
Public APIYesNot confirmed
Trust score94 / 10092 / 100
PlatformsWeb, APIWeb
CompanyKlaviyoChatdesk Inc (DBA Remarkable AI)
Last verifiedSep 6, 2026Oct 14, 2026

What our research says

Klaviyo

The default marketing stack for Shopify-scale e-commerce because its data model is built around customer events rather than lists, so predictive fields and AI-built segments actually have something to work with. The free tier is a sandbox, the real cost climbs with active profiles, and once SMS, Composer usage and service modules are switched on the invoice has several meters, not one.

Pros

  • Pricing by active profiles with a real free tier (250 profiles, 500 sends) and no card
  • Predictive churn, lifetime value and next-order date per profile built in
  • Composer builds and audits flows and campaigns from natural-language prompts
  • Public REST API with maintained SDKs in Python, PHP, Ruby and more
  • Email, SMS/MMS, push and a helpdesk module share one customer profile

Cons

  • Costs step up with every active-profile band; the $20 entry price covers only 251–500 profiles
  • SMS, Composer usage and support packages are separate meters on top of the plan
  • The pricing page shows the entry bands and leaves larger bands to a calculator
  • The platform has widened into service and analytics, adding modules a small brand will not use

Retain AI

Retain AI automates a genuinely tedious task, writing and sending win-back emails to lapsed customers, and it costs nothing to try since it's a free Shopify app. The tradeoff is that it only reaches customers 90 days after their last order, so it won't help a store that needs faster-turnaround retention campaigns.

Pros

  • Free to install with no paid tier or usage cap disclosed
  • Generates a custom image per email rather than reusing a static template
  • Segments customers automatically by purchase history

Cons

  • Fixed 90-day trigger with no visible way to customize timing
  • Shopify-only, doesn't work on other ecommerce platforms

Which one fits

Choose Klaviyo if you need

  • E-commerce brands on Shopify, WooCommerce or similar with real order data to segment on
  • Teams that want churn, lifetime-value and next-order predictions without a data scientist
  • Marketers who want flows and campaigns drafted from a prompt and audited by the same assistant

Choose Retain AI if you need

  • Shopify merchants wanting automated win-back email without writing copy
  • Stores that don't already run a dedicated email marketing platform
  • Merchants who want retention emails with auto-generated product imagery

Klaviyo vs Retain AI: the questions people ask

Is Klaviyo cheaper than Retain AI?

Retain AI is free to use; Klaviyo starts at $20/mo.

Does Klaviyo or Retain AI have a free tier?

Both: Klaviyo has a free tier, and Retain AI is free to use.

Which has a public API, Klaviyo or Retain AI?

Klaviyo ships a public API, as of our last verification. A public API for Retain AI is not confirmed by us — check its developer docs before you plan an integration.

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