Topic · 3 articles
Extensibility
Every Cartylabs guide tagged "Extensibility". Tactical playbooks for Shopify operators on this topic.
ComparisonCheckout
Best Shopify Checkout Extensions for 2026 (The Apps That Actually Use Checkout UI Extensions)
The top Shopify checkout extension apps for 2026 — trust badges, upsells, custom fields, gift offers, payment customizers — compared on Extensibility support, pricing, and fit.
11 min read
CheckoutExtensibility
Checkout Blocks vs Checkout Extensions: What's the Difference, and Which Should You Use?
Checkout Blocks (the Shopify app) vs Checkout UI Extensions (the underlying Shopify platform feature) — what each one is, when to use which, and how they fit together in 2026.
9 min read
CheckoutShopify
Shopify Checkout Extensibility Explained: What It Is, Why It Matters, and How to Use It
The complete explainer for Shopify Checkout Extensibility in 2026 — what replaced checkout.liquid, the difference between UI Extensions, Functions, and Branding API, and what you can and can't customize.
11 min read
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