CartHook was one of the earliest post-purchase upsell solutions for Shopify. It pioneered the concept of showing one-click offers after checkout and built a strong reputation in the ecosystem.
But the Shopify app landscape has evolved significantly. With Shopify's native Post-Purchase Extensions API, newer apps like Kairo have been built from the ground up on modern technology. Let's see how they compare.
Feature Comparison
| Feature | Kairo | CartHook |
|---|---|---|
| Post-purchase upsells | ||
| Built on latest Shopify API | Older integration | |
| Visual drag-and-drop editor | 26 block types | Template-based |
| Flow builder with branching | 10 condition types | Basic sequencing |
| A/B testing | Flows & offers | Limited |
| Thank you page | ||
| Order status page | ||
| Checkout page (Plus) | ||
| Customer surveys | ||
| Quantity breaks | ||
| Subscription upsells | ||
| Usage-based pricing |
Technology & Integration
CartHook was originally built before Shopify offered a native post-purchase API. It relied on custom checkout integrations that worked but required more setup and had occasional compatibility issues with other apps.
Kairo is built entirely on Shopify's official 2026-01 Post-Purchase Extensions API. This means it runs natively within Shopify's checkout flow — no custom integrations, no compatibility concerns, no impact on store performance. It's the approach Shopify recommends.
Editor & Customization
CartHook offers template-based offer pages with standard customization options — text, images, colors. The templates are clean and functional but don't offer the depth of a modern page builder.
Kairo's visual editor provides 7 section types and 26 block types that you can arrange freely. Countdown timers, quantity breaks, review widgets, icon benefits, subscription toggles, image sliders — every element is customizable down to colors, spacing, borders, and typography. You also get 14 pre-built templates as starting points.
Pricing
CartHook offers a free plan (up to 100 orders) but charges a 1% revenue fee on ALL plans, including paid tiers at $10, $25, and $40/month. The trial is only 3 days — one of the shortest in the category. CartHook also has a 3.7 rating on the Shopify App Store, the lowest among the major upsell apps.
Kairo uses usage-based pricing tied to upsell revenue. Starting at $8/month with a 14-day free trial, pricing scales with your earnings. You never subsidize underperforming upsells.
The Verdict
CartHook was a pioneer, and it deserves credit for popularizing post-purchase upsells on Shopify. But the category has moved forward.
If you're looking for a modern post-purchase platform built on Shopify's latest technology, with a deep visual editor, conditional flows, A/B testing, and fair pricing — Kairo is the better choice in 2026.
Compare all the top options in our best Shopify post-purchase upsell apps roundup.
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