Cart upsell popup (pre-purchase)
In-cart upsells the moment they add to cart.
When a customer adds a product to their cart, show an add-to-cart popup with up to three offers that complete it: the accessory, the refill, the gift wrap. One tap adds it alongside. No code, no theme conflicts.
Triggered by add-to-cart
Targeting rules by product, collection or cart value. Different products, different cross-sells.
Fully on-brand
Colours, fonts, copy, images and layout are yours, with a live preview while you edit.
Theme app extension
Lightweight, loads after your page, no injected scripts or Ajax-cart conflicts. Nothing breaks when you change themes.
Up to three offers
Complete the purchase, do not interrupt it.
The best in-cart upsells feel like help, not a hurdle. Show the things people forget: the case for the headphones, the beans for the pour-over, the batteries. Cart X lets you show one to three cross-sell offers and tune the discount on each.
- Product, collection and cart-value targeting rules.
- Compare-at pricing, multi-product offers and quantity selectors.
- One tap adds to cart and continues to checkout; no page reload.
Measure and iterate
See which popup lifts AOV, and which one annoys.
Every popup is an upsell funnel with its own numbers: impressions, adds, revenue. Compare offers, split-test copy and discounts, and switch off anything that does not carry its weight.
- Impression, click and add-to-cart rates per offer.
- A/B testing with automatic winner reporting.
- Upsell revenue attributed per funnel, and every dollar of it stays yours: no revenue cap, 0% commission.
Combine placements
Works even better together.
Most stores run all three. Each is a separate funnel with its own triggers, offers and analytics.
Merchant reviews
Rated 5.0 on the Shopify App Store
Verbatim excerpts from public Shopify reviews. Real stores, real orders.
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.
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.
I love the ease of set-up and the detailed customization! Great App!! You'll love it too.
Cart X is a good post purchase upsell app. It helped increased my AOV and easy to use. Their client support is very responsive.
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.
Really helpful and gave me additional tips to help improve the performance.
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.
What acceptance rate should I expect from upsell offers?
Industry benchmarks put average post-purchase acceptance around 5%, with optimized offers reaching 10% to 15%. In-cart popups typically convert 4% to 6% of viewers, and thank you page offers 2% to 15% depending on relevance. Cart X's analytics show your actual rates per funnel so you can iterate.
How do I choose which products to upsell or cross-sell?
Start with items frequently bought together, accessories and consumables for the trigger product, and higher-margin products you want to move. Cart X targeting rules let you set different offers per product, collection, cart value or customer tag, and A/B test them.
How many upsell offers should I show?
One strong post-purchase offer with a downsell is the usual sweet spot. Cart X supports up to three sequential post-purchase offers, so you can test deeper upsell funnels on your best-selling products without ever looping the customer.
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.
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