---
title: "ExtensionKit ‑ Custom Checkout Shopify App Profile"
description: "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."
canonical_url: "https://shoplist.co/shopify-apps/extensionkit-custom-checkout"
markdown_url: "https://shoplist.co/shopify-apps/extensionkit-custom-checkout.md"
last_updated: "2026-09-03"
entity_type: "shopify_app"
slug: "extensionkit-custom-checkout"
source: "public Shopify app profile allowlist"
---

# ExtensionKit ‑ Custom Checkout Shopify App Profile

> 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.

## Quick answer
ExtensionKit ‑ Custom Checkout has 0 detected stores in Shoplist. This Markdown profile displays 0 public brand examples; it is not a complete customer list.

## Key facts
- Name: ExtensionKit ‑ Custom Checkout
- Monitoring status: Storefront detection limited
- Developer: Maverick Apps
- Developer profile: https://shoplist.co/app-developers/maverick-apps
- Shopify App Store URL: https://apps.shopify.com/extension-kit
- Website: https://docs.extensionkit.app
- Launch date: September 18, 2024
- Shoplist category: Checkout - Other
- Rating: 5
- Review count: 2
- Free trial signal: Yes

## Pricing summary
Startup: Free to install; Small Business: $19.99/month; Growth: $49.99/month; Enterprise: $99.99/month

Shoplist has not yet found reliable public storefront evidence connecting a Shopify store to this app. This does not mean the app has no users. Some apps are new, admin-only, server-side, theme-independent, or otherwise difficult to detect from public storefront signals.


## Public callouts
- 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
## Shopify App Store categories
- Checkout - Other

## Data note
Profile updated: September 3, 2026. This is the profile revision date, not a guarantee that every store was checked on that date.
Public snapshot built: 2026-10-14 00:10:42.792685\+00
Detection metrics refreshed: 2026-10-21 05:10:00.074882\+00
Public app evidence date: 2026-09-03 08:35:32.627016\+00
This generated Markdown profile intentionally exposes only public, stable app-profile fields and a small public app-stack sample from Shoplist. It excludes private contact data, people data, internal scores, crawl provenance, full datasets, and unstable operational fields.

## Related links
- [HTML app profile](https://shoplist.co/shopify-apps/extensionkit-custom-checkout)
- [Shopify apps directory](https://shoplist.co/shopify-apps)
- [Shoplist data methodology](https://shoplist.co/data-methodology.md)