Side-by-side comparison
Essential Upsell & Cross Sell vs King Checkout Validationfor Shopify (2026)
A detailed comparison of Essential Upsell & Cross Sell and King Checkout Validation to help you pick the right Shopify app for your store.
5.0 ★
Essential Upsell & Cross Sell
5.0 ★
King Checkout Validation
1
Shared Category
Checkout
At a Glance
Essential Upsell & Cross Sell
5.0
1,004 reviews
King Checkout Validation
5.0
8 reviews
Detailed Overview
Essential Upsell & Cross Sell
One click upsell and cross sell. Show frequently bought together product upsell & related products.
5.0
1,004 reviewsKey Features
- Show frequently bought products (FBT), related products, product recommendations
- Post purchase upsell & cross sell: Product addons, bought together bundles
- Automatic discount promotions: Add discounts to upsell & "also bought" products
- Product page upsell: Add one click upsell & cross-sell products & BOGO bundles
- Cart upsell: Add upsell cart app, cross-sell & product add-ons to cart drawer
King Checkout Validation
Block checkout errors and enforce checkout validation with real-time address validation
5.0
8 reviewsKey Features
- Block invalid checkouts with real-time validation checks
- Auto-detect missing house/apartment numbers, block Post office (PO) Box address
- Validate fields base on keywords and regular express
- Block non-Latin chars & enforce field limits
- Customize validation rules based on combinations of order amount, weight, etc
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