ExtensionKit ‑ Custom Checkout

Develop by Shopify

$19.99-$99.99

/ Month

Free plan available 14 Days Free Trial

"Enhance Shopify checkout with upsells, custom fields, and dynamic discounts."

Custom fields

Dynamic discounts

Timed promotions

Product upsells

Drag-and-drop customization

About ExtensionKit ‑ Custom Checkout

Launched Sep 17, 2024

Built by Shopify

Address

Fairfax, VA, US

Website Support Portal Privacy policy Tutorial FAQ Document

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Description

Supercharge your checkout with upsells, custom fields, discounts, cart validations & more

Unlock the full potential of your Shopify checkout with Extension Kit. Generate revenue with product upsells and subscription upgrades, and collect additional information from customer's with custom fields. Easily customize checkout pages using drag-and-drop blocks for banners, images, and informational text. Customizable for all of your customer's with Shopify Markets. Advanced discounts powered by Shopify Functions. Checkout customizations built for Shopify Plus plans only.

Checkout product upsells, subscription upgrades, banners, custom fields & more
Create tiered product or order discount promotions
Schedule blocks and discounts for timed promotions
Limit quantity of items in the cart
Compatible w/ Shopify B2B & Shopify Markets for translations and multi-currency

Pros

Enhances Shopify checkout with upsells, driving additional revenue.
Supports subscription upgrades to increase recurring revenue opportunities.
Allows collection of additional customer information with custom fields.
Easy to customize checkout pages using drag-and-drop blocks.
Offers advanced discount features powered by Shopify Functions.
Compatible with Shopify B2B and Shopify Markets for translations and multiple currencies.
Schedule blocks and discounts for timed promotions, providing flexibility in marketing strategies.
Limit quantity of items in the cart, adding control over orders.

Cons

Customizations are available exclusively for Shopify Plus plans, limiting accessibility to premium users.
Complex features may require additional time and resources to set up effectively.
The app might not be suitable for smaller stores that do not require advanced checkout customizations.

Top Helpful Reviews

GALLERY DEPT.

Jan 30, 2025 on Shopify

We use this app daily to showcase a variety of products, and the product upsell feature has been a game changer! It made adding relevant products at checkout effortless, and since utilizing this app we have seen a major boost in sales. The setup was quick, everything runs smoothly, and the upsells feel natural and not pushy. It has been a great way to show customers products that can complete their outfits, or add a last minute gift to their order! If you want to increase your order value without any hassle, this app is a must have!

Pura Vida Bracelets

Jan 28, 2025 on Shopify

The Extension Kit app has really helped with transitioning to the new checkout. It made the whole process a lot simpler and has been useful for migrating away from Shopify's Script Editor app. It's saved our team a ton of time, and I’d definitely recommend it to anyone using Shopify Plus!