# Cart X

> Cart X is a Shopify upsell app by Funnelish: one-click post purchase upsells with downsells, in-cart upsell popups, and thank you page offers, built on Shopify Checkout Extensibility. Free up to 100 orders a month, then flat pricing with no revenue cap and 0% commission.

This site may be crawled, indexed and quoted by AI systems. A full-text version is at https://cart-x.io/llms-full.txt. Every blog post and case study is also available as Markdown by appending .md to its URL.

## Key facts

- Product: Cart X, a Shopify upsell app. Three placements: in-cart popup upsells and cross-sells (theme app extension), one-click post-purchase upsells with downsells (Shopify post-purchase checkout extension, up to 3 upsells and 3 downsells), and thank you page / order status page offers with a drag-and-drop builder.
- Built on Shopify Checkout Extensibility. Works with any theme, no code. Targeting rules by product, collection, cart value and customer tag. A/B testing and upsell revenue analytics. Multi-currency and multi-language.
- Setup time: 2 to 5 minutes. The “Money Machine” template puts a post-purchase upsell funnel live in one click.
- Rating: 5.0 on the Shopify App Store. Install: https://apps.shopify.com/cart-x?utm_source=cart-x.io&utm_medium=website
- Operator: Funnelish Pte. Ltd., 68 Circular Road, #02-01, Singapore 049422. Cart X was acquired by Funnelish. Contact: hey@cart-x.io. X: https://x.com/CartXApp
- Log in (Shopify admin): https://admin.shopify.com/apps/cart-x-app

## Pricing (flat, tiered by store orders per month)

- Free: $0/month, up to 100 store orders/month, Community support, offers show a small “Powered by Cart X” badge
- Grow: $19/month, up to 1,000 store orders/month, Email + chat support
- Scale: $49/month, up to 10,000 store orders/month, Email + chat support
- Unlimited: $199/month, no order cap, Email + chat support

- No revenue cap: earn unlimited upsell revenue on every plan, including Free
- No commission: we never take a percentage of your upsell revenue
- No per-order fees, no usage charges, no overage surprises
- Flat monthly price, billed through your Shopify invoice, cancel any time
- A legacy Starter plan ($9.99/month, up to 250 orders) is no longer sold; existing subscribers keep it.

## Included on every plan

- Unlimited upsell funnels
- In-cart offers: add-to-cart popup upsells and cross-sells
- Post-purchase one-click upsells and downsells (up to 3 upsells and 3 downsells)
- Thank you page and order status page upsell offers
- Thank you page customization with a drag-and-drop builder
- Targeting rules by product, collection, cart value and tag
- Compare-at pricing, multi-product offers and countdown timers
- A/B testing and upsell revenue analytics
- Built on Shopify Checkout Extensibility, works with any theme
- Multi-currency and multi-language

## Pages

- [Home](https://cart-x.io/): What Cart X is: one-click post purchase upsells, in-cart popups and thank you page offers for Shopify.
- [Post-purchase upsell (one-click)](https://cart-x.io/post-purchase-upsell): Offers after payment, accepted in one click with the same payment method; up to 3 upsells and 3 downsells.
- [Cart upsell popup](https://cart-x.io/cart-upsell): Add-to-cart popup with up to three cross-sell offers, theme app extension, no code.
- [Thank you page upsell](https://cart-x.io/thank-you-page-upsell): Drag-and-drop builder for the order confirmation and order status page: offers, codes, timers.
- [Pricing](https://cart-x.io/pricing): Free up to 100 orders/month, then flat plans by order volume. No revenue cap, 0% commission.
- [Case studies](https://cart-x.io/case-studies): Merchant results with real revenue numbers.
- [Blog](https://cart-x.io/blog): Guides on upsell strategy, AOV and Shopify checkout.
- [Contact](https://cart-x.io/contact): Email hey@cart-x.io, in-app chat, X @CartXApp.
- [Terms of Service](https://cart-x.io/terms): Terms for the Cart X app and website.
- [Privacy Policy](https://cart-x.io/privacy): How Funnelish Pte. Ltd. handles merchant, customer and visitor data.

## Case studies

- [How Inessa Wellness generated $13,000 in additional revenue with three upsell placements](https://cart-x.io/case-studies/how-inessa-generated-13-000-additional-revenue-with-cart-x): UK clinic Inessa Wellness added roughly $13,000 to its Shopify store with Cart X in-cart, post-purchase and thank you page upsells, broken down by placement.
- [Flex Moves adds $10,800 in upsell revenue with one-click post-purchase offers](https://cart-x.io/case-studies/flex-moves-adds-10-800-in-revenue-with-cart-x): Flex Moves used Cart X post-purchase upsells to earn $10,853 in additional revenue from existing customers, with 654 one-click orders averaging about $15 each.
- [How Earify added $10,000 in revenue by launching new products as post-purchase upsells](https://cart-x.io/case-studies/how-earify-added-10k-revenue-using-cart-x): Earify used Cart X one-click post-purchase upsells to launch new products to existing customers, generating 421 upsell orders and $10,046 in extra revenue.

## Blog

- [How to add upsells to a new Shopify store, step by step](https://cart-x.io/blog/how-to-implement-upsell-to-a-new-shopify-store): A step-by-step guide to adding your first post-purchase upsell to a new Shopify store: the math, what you need, setup, benchmarks and the mistakes to avoid.
- [How to increase average order value on Shopify: 7 tactics](https://cart-x.io/blog/how-to-increase-average-order-value-shopify): Seven ways to increase average order value on Shopify: post-purchase upsells, free shipping thresholds, bundles and volume tiers, with profit math behind each.
- [Pre-purchase vs post-purchase upsell: which converts better?](https://cart-x.io/blog/pre-purchase-vs-post-purchase-upsell-which-one-is-better): Pre-purchase upsells reach every shopper; post-purchase converts 2-3x higher with no risk to the sale. When to use each on Shopify and how to combine them.
- [7 ways to optimize your Shopify thank you page for revenue](https://cart-x.io/blog/best-ways-to-optimize-your-shopify-thank-you-page): Your Shopify thank you page and order status page are seen by every buyer. The five elements they need and seven optimizations ranked by revenue impact.
- [Checkout UI extensions vs legacy Shopify checkout apps](https://cart-x.io/blog/checkout-ui-extensions-vs-legacy-apps): How Shopify checkout UI extensions differ from script-tag and checkout.liquid apps, what each plan can use, and how to move your upsells without losing revenue.
- [Shopify INP fix: stay under 200 ms with checkout UI extensions](https://cart-x.io/blog/shopify-inp-fix-how-to-stay-under-200ms-with-native-ui-extensions): What Interaction to Next Paint measures on a Shopify checkout, why script-injecting upsell apps push it past 200 ms, and how native extensions fix it.
- [Upgrading from checkout.liquid to Checkout Extensibility (2026)](https://cart-x.io/blog/upgrading-from-checkout-liquid-to-shopify-checkout-extensibility-in-2026): Step-by-step migration from checkout.liquid, script tags and additional scripts to Shopify Checkout Extensibility, keeping upsells and tracking working.
- [How to recover abandoned cart sales on Shopify in 2026](https://cart-x.io/blog/ways-to-recover-abandoned-cart-sales-for-shopify): Why about 7 in 10 Shopify carts are abandoned, how carts differ from abandoned checkouts, and seven recovery tactics from checkout fixes to upsells.
- [Best upsell combinations to sell on Shopify: 7 that work](https://cart-x.io/blog/best-upsell-combinations-to-sell-on-shopify): The seven upsell and cross-sell combinations that lift AOV on Shopify, when to show each one (in-cart, post-purchase, thank you page) and how to set them up.
- [Post purchase upsells: the pros, cons and when to use them](https://cart-x.io/blog/post-purchase-upsell-the-goods-and-bads): How post purchase upsells work on Shopify, why one-click offers convert 5-15%, the real downsides (refunds, reach, fulfilment) and how to set one up.
- [The psychology of one-click upsells: why less friction converts](https://cart-x.io/blog/the-power-of-one-click-upsell-why-its-so-effective): Why one-click post purchase upsells convert 2-3x better than cart popups: the psychology of friction, commitment and anchoring, plus how to build the funnel.
- [What is a Shopify upsell? A merchant's guide to boosting AOV](https://cart-x.io/blog/what-is-a-shopify-upsell): What a Shopify upsell is, how it differs from a cross-sell, where to show offers (cart, post-purchase, thank you page) and how to measure AOV lift.
- [Shopify store marketing: a practical guide for 2026](https://cart-x.io/blog/mastering-shopify-store-marketing-a-comprehensive-guide): A working plan for marketing a Shopify store: fix conversion first, raise AOV with upsells, build retention with email and SMS, then scale channels.
- [Top 5 must-have Shopify apps for your store](https://cart-x.io/blog/top-5-must-have-shopify-apps-for-your-store): The five app categories every Shopify store needs: upsells, cart recovery, reviews, bundles and tracking, with current picks and what to look for in each one.
- [3 types of upsell and which one works best on Shopify](https://cart-x.io/blog/3-different-types-of-upsell-which-one-is-the-most-effective): The three upsell types (upgrade, add-on cross-sell, quantity or bundle offer), where each belongs in a Shopify store, benchmark take rates and how to pick one.
- [6 benefits of upselling and cross-selling for Shopify stores](https://cart-x.io/blog/6-benefits-of-upselling-and-cross-selling-for-all-businesses): Upselling and cross-selling raise average order value, protect margins and lift repeat purchases. Six benefits, the math behind them and where to place offers.
- [How to upsell on Shopify effectively: 8 techniques that work](https://cart-x.io/blog/how-to-effectively-upsell-on-shopify): Upselling on Shopify: where offers can appear, how to choose and price them, why post-purchase comes first, and eight techniques that lift AOV.
- [Top 3 Shopify sales techniques every store should use](https://cart-x.io/blog/top-3-shopify-sale-techniques-that-you-need-to-know): Upselling, cross-selling and guided selling are the three techniques that move Shopify AOV. How each works, where to place it, and how to keep offers compliant.
- [Upselling vs cross-selling: what's the difference on Shopify?](https://cart-x.io/blog/upselling-vs-cross-selling-what-is-better): Upselling upgrades the item in the cart; cross-selling adds a complementary one. Which converts better on Shopify, where to show each, and how to run both.

## Optional

- [Shopify App Store listing](https://apps.shopify.com/cart-x?utm_source=cart-x.io&utm_medium=website)
- [App reviews](https://apps.shopify.com/cart-x/reviews)
- [Funnelish](https://funnelish.com)
- [Sitemap](https://cart-x.io/sitemap.xml)