What do cart customization app merchants complain about most? (breaks checkout/site)

Across 220 low-star reviews in this niche, 30% centre on breaks checkout/site. Example: “broke my checkout in the middle of the night”

What do cart customization app merchants complain about most? (unexpected billing)

Across 220 low-star reviews in this niche, 27% centre on unexpected billing. Example: “I was billed $400... WITHOUT MY CONSENT.”

What do cart customization app merchants complain about most? (poor support response)

Across 220 low-star reviews in this niche, 23% centre on poor support response. Example: “Customer support doesn’t help you with anything.”

Top Shopify Cart customization apps

Who ranks, what merchants complain about, and whether the niche is growing — read from our own daily crawl of the Shopify App Store.

Apps in niche

540

30-day growth

1.5%

Leader

ReConvert Post Purchase Upsell

Leader share

9.9%

Top 10 today

as of 13 November 2026

1
Kaching Post Purchase Upsell
Offer one-click upsells after checkout to boost your AOV. Easy setup, seamless customization!
5.0(445)
2
EG Auto Add to Cart Free Gift
EasyGift auto adds free gifts to the cart. Run gift with purchase (GWP), BOGO and buy X get Y offers that lift order value. Free plan available.
5.0(1,157)
3
Kaching CartDrawer Cart Upsell
Boost AOV with a custom slide cart featuring upsells, urgency timer, free shipping/gift bar, etc.
5.0(1,643)
4
Essent Cart Drawer Cart Upsell
Add a cart drawer with AI upsells, reward bar, free shipping goals and sticky add to cart bar. Customize with HTML and CSS. Markets and 24/7 support.
5.0(1,223)
5
Scala Payment Method Discount
Reduce payment fees, get paid faster and lose fewer orders by discounting your preferred payment method with Scala. Tested with 200+ payment method...
5.0(87)
6
Essential Upsell & Cross Sell
Boost AOV with the Essential Upsell app, offering customizable product upsell & cross-sell & "add to cart" widgets. Display frequently bought toget...
5.0(2,494)
7
Shipy ‑ Hide Shipping Rules
Hide/Rename the delivery options on checkout using various conditions like Cart total, Zip code, Customer tag, Products. And Sort/Reorder Shipping rates
5.0(156)
8
Payflow: COD & Checkout Rules
Add Cash on Delivery fees, customize payment or delivery methods, and create checkout validations using rules based on cart, customer, product, address and more
5.0(118)
9
Section Store & Cart Drawer
Cart drawer, bundles, AI pages and theme sections in one app. Ask Claude or ChatGPT to build your cart, bundles and A/B tests over MCP.
4.9(3,016)
10
Snap Cart Drawer Cart Upsell
Boost your AOV with cart upsell designs, slide cart drawer, cart reward bar, progress bar and free shipping bar and more
4.7(94)

What merchants complain about

The top three themes across 220 low-star reviews in this niche — grouped from our own corpus, every theme carries a real quote.

breaks checkout/site
30% of complaints
“broke my checkout in the middle of the night”
unexpected billing
27% of complaints
“I was billed $400... WITHOUT MY CONSENT.”
poor support response
23% of complaints
“Customer support doesn’t help you with anything.”

Clustered on 18 September 2026.

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