Free
$0/ mo
Up to 100 store orders / mo
Every feature on a live store. Offers carry a small “Powered by Cart X” badge.
Start for free- No revenue cap, 0% commission
- Every product feature
- Community support
- “Powered by Cart X” badge (remove on Grow)
★★★★★5.0 on the Shopify App Store
Boost AOV with one-click post purchase upsells.
Cart X is the Shopify upsell app for all three placements: in-cart upsell popups, one-click post purchase upsells with downsells, and thank you page offers. Built on Checkout Extensibility. Flat pricing with no revenue cap and 0% commission, free up to 100 orders a month.
- Free plan, every feature
- No revenue cap, 0% commission
- No re-entering payment details
5.0★App Store rating
0%commission, no revenue cap
1 clickto accept, no card re-entry
3placements: cart, post-purchase, thank you
Three placements, one upsell funnel
Cart upsell, post purchase upsell, thank you page upsell.
Each placement is an upsell funnel you design: targeting rules, upsell and cross-sell offers, and the downsell shown on decline.
In-cart · pre-purchase
Cart upsell popup
The moment a product is added to cart, show up to three cross-sell offers: accessories, consumables, gift wrap. One tap adds them.
Learn morePost-purchase · one-click
Post purchase upsell
After payment, before the order confirmation. Customers accept in one click without re-entering payment details. Declines fall to a downsell.
Learn moreThank you · order status
Thank you page upsell
Turn the order confirmation and order status page into a cross-sell storefront: offers, post-order discount codes, timers, recommendations.
Learn morePost purchase upsell
One click. No re-entering payment details. Zero checkout risk.
Cart X uses Shopify's native post-purchase checkout extension. The customer has already paid, so the offer appears between checkout and the order confirmation page. One tap adds it to the same order and charges the same payment method. Your checkout conversion rate is never touched.
- Upsell funnels up to three offers deep, each with its own downsell when declined.
- Compare-at pricing, Save badges and countdown timers within Shopify's offer guidelines.
- Ships with the original order. One parcel, one confirmation email, no extra shipping.
Declined? Show a downsell.
Cable kit only$12.00
Upsell analytics
Know which offer lifted AOV this month.
Every accepted offer is attributed to the funnel, placement and product that earned it. Compare upsell funnels side by side, A/B test copy and discounts, and retire the offers that do not convert.
- Upsell revenue, acceptance rate and AOV lift, per funnel and placement.
- A/B tests with automatic winner reporting.
- Every dollar stays yours: no revenue cap and 0% commission on any plan.
How it works
Live in 2 to 5 minutes.
Install, pick a template, done. No developer, no theme edits, no waiting on a review.
- 01
Install from the Shopify App Store
One click to install. Cart X reads your catalogue and you land on the Free plan with every feature enabled.
- 02
Go live with one click
Pick the Money Machine template and your post-purchase upsell funnel is live instantly, offers chosen from your catalogue. Or build your own: targeting rules, upsells, downsells, design.
- 03
Watch AOV climb
Offers appear at add-to-cart, after payment and on the order confirmation page. Analytics shows exactly what each one earned.
Why Cart X
Everything a Shopify upsell app should do. Nothing you have to babysit.
Built on Checkout Extensibility
Post-purchase and thank you page offers are checkout UI extensions; the cart popup is a theme app extension. No checkout.liquid, no injected scripts, no theme conflicts.
Upsell funnels with downsells
Up to three post-purchase offers, each with a downsell on decline. A/B test offers, copy and design per funnel.
Targeting rules
Target by product, collection, cart value or customer tag. Different cross-sells for different carts.
No revenue cap, no commission
Flat plans tiered by store orders. Generate unlimited upsell revenue on any plan, including Free, and keep all of it.
Accurate upsell attribution
Every dollar of upsell revenue is tied to the funnel and offer that earned it. AOV lift, acceptance rate and revenue per placement.
Support that answers
Email and chat support from the Funnelish team on paid plans, plus a community for everyone.
Merchant reviews
Rated 5.0 on the Shopify App Store
Verbatim excerpts from public Shopify reviews. Real stores, real orders.
Verified · Sep 2025
Really good app to prompt customers to add optional parts to their cart. It saves them receiving a product and then being disappointed they didn't realise they needed to order the other bit.
Verified · Aug 2022
This upsell app is exactly what we're looking for, fully control, especially we can select trigger products. And their team service is great as well, fast, and efficient.
Verified · Sep 2024
I love the ease of set-up and the detailed customization! Great App!! You'll love it too.
Verified · Sep 2022
Cart X is a good post purchase upsell app. It helped increased my AOV and easy to use. Their client support is very responsive.
Verified · Dec 2022
Amazing app, it helped me scale really quickly with their upsells. Customer service is amazing too. Really recommend this app to anyone trying to scale.
Verified · Jan 2025
Really helpful and gave me additional tips to help improve the performance.
Pricing
Flat pricing. Keep 100% of your upsell revenue.
Plans are tiered by your store's monthly orders. No revenue cap, no commission, no per-order fees, on any plan.
Grow
$19/ mo
Up to 1,000 store orders / mo
For growing stores running funnels on every placement. Removes the badge.
Start for free- No revenue cap, 0% commission
- Every product feature
- Email + chat support
- No Cart X branding
Scale
$49/ mo
Up to 10,000 store orders / mo
For high-volume stores that A/B test everything.
Start for free- No revenue cap, 0% commission
- Every product feature
- Email + chat support
- No Cart X branding
Unlimited
$199/ mo
Unlimited store orders / mo
No order cap. One flat price, however big you get.
Start for free- No revenue cap, 0% commission
- Every product feature
- Email + chat support
- No Cart X branding
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
How long does it take to go live?
Two to five minutes. Install from the Shopify App Store, pick the Money Machine template and a post-purchase upsell funnel goes live in a single click with offers chosen from your catalogue. Prefer full control? Set your own targeting rules, upsells, downsells and design, then publish.
What is a post purchase upsell?
A post purchase upsell is an offer shown after the customer pays and before the order confirmation page. Because payment is already captured, the customer can accept with one click and the item is added to the same order without re-entering payment details. It is the highest-converting upsell placement on Shopify because it carries zero risk to checkout conversion.
How is a post purchase upsell different from a checkout upsell?
A checkout upsell appears during checkout, before payment, and can distract from completing the order. A post purchase upsell appears after payment, so the original sale is already safe. Cart X focuses on post-purchase, in-cart and thank you page offers, the three placements that add revenue without touching your checkout conversion rate.
Does the customer really pay in one click, without re-entering their card?
Yes. Cart X is built on Shopify's post-purchase checkout extension. Accepting an offer charges the same payment method used at checkout and adds the product to the existing order, with shipping and taxes recalculated automatically. No second checkout, no re-typed card.
Is Cart X built on Checkout Extensibility?
Yes. Post-purchase and thank you page offers run as Shopify checkout UI extensions, and the in-cart popup is a theme app extension. Nothing relies on checkout.liquid or injected scripts, so offers keep working after Shopify's checkout migration and when you switch themes.
Which payment gateways support one-click post purchase upsells?
Shopify Payments, PayPal Express, Stripe and most major gateways support post-purchase offers. Shopify lists the current requirements in its post-purchase documentation, and Cart X shows you in-app whether your store is eligible before you publish a funnel.
What happens when a customer declines an offer?
You choose the path. Show a downsell (a cheaper or different product), move to the next upsell, or send them to the thank you page. Each upsell funnel can chain up to three post-purchase offers, each with its own downsell, within Shopify's limit of three accepted offers per checkout.
How much does Cart X cost?
Cart X is free for stores up to 100 orders a month, with every feature. Paid plans are flat and tiered by your store's monthly orders: Grow $19 (up to 1,000), Scale $49 (up to 10,000) and Unlimited $199 with no cap. There is no revenue cap, no commission on upsell revenue and no per-order fee. Billing runs through your Shopify invoice.
Start boosting AOV today.
Install Cart X from the Shopify App Store, publish your first post-purchase upsell funnel in minutes, and keep 100% of the revenue it generates. Free up to 100 orders a month.
Free plan · All features · No revenue cap · 0% commission · Billed through Shopify when you upgrade