Get a bespoke Shopify custom app with UI extensions and advanced checkout customisation, built exclusively for Shopify Plus merchants by London-based ecommerce developers.
I Will Build a Custom Shopify App for Your Shopify Plus Store
A custom Shopify app with a simple Checkout UI Extension for Shopify Plus stores.
- Custom Shopify app built for your Shopify Plus store
- Simple Shopify Checkout UI Extension included
- Functional app integrated with your store
- 1 extension or page scope
- 2 rounds of revisions
- Delivered in 14 days
An expanded custom app with more complex UI extensions or Shopify Functions logic for Shopify Plus.
- Everything in Basic, with greater functional complexity
- Advanced Checkout UI Extensions or Shopify Functions implementation
- Suitable for discount logic, shipping rules, or payment customisation
- Expanded app scope beyond a single basic extension
- 2 rounds of revisions
- Delivered in 21 days
A fully featured, deeply custom Shopify Plus app with sophisticated integrations and advanced functionality.
- Everything in Boost, with full end-to-end custom build
- Sophisticated Shopify Functions and Checkout UI Extensions combined
- Third-party system integration and regulatory compliance support
- Comprehensive checkout customisation aligned to your brand identity
- 2 rounds of revisions
- Delivered in 45 days
Request a Custom Offer
Log In to Request a Custom Offer
Create a free account or log in to request a personalised offer from this Zinner.
Log In / RegisterAsk a Pre-Sale Question
Log In to Ask a Question
To reduce platform spam, pre-sale messages can only be sent by logged-in users.
Create a free account or log in to message this Zinner directly.
Log In / RegisterAt a Glance
Key details about this service to help you decide. Generated by Zinn Hub, not the seller.
Value Position
Platform Requirement
Tech Approach
Base Delivery
Starting Investment
What You'll Receive
Full Description
If you run a Shopify Plus store, you already know that the standard checkout is a ceiling — not a floor. This service tears that ceiling off.
Zinn Digital builds fully custom Shopify apps with Checkout UI Extensions and Shopify Functions, giving your Plus store the bespoke checkout experience your brand and your customers deserve. Whether you need sophisticated discount logic, tailored shipping rules, expanded payment options, or a checkout that mirrors your brand identity pixel-perfectly, this is the service that delivers it.
Custom Shopify app development at this level is not a template job. Every solution is engineered from the ground up to fit your store's specific requirements — not bolted onto a generic plugin that half-works.
**What this service covers:**
We design, develop, and deliver a functional custom Shopify app that integrates directly with your Shopify Plus store. At the entry tier, this includes a custom app with a Shopify UI extension — the essential building block for checkout customisation. As you scale up through tiers, the scope expands to cover more complex functionality, deeper integrations, and more sophisticated Shopify Functions logic.
The development process is straightforward: you share your store details and requirements, we assess the scope, get to work, and deliver a fully functional solution within the agreed timeframe. You'll have the opportunity to request revisions so the final output matches your expectations.
**Who this is for:**
This service is built exclusively for Shopify Plus merchants. Shopify Functions and Checkout UI Extensions are not available on standard Shopify plans — if you're on a standard plan, this service is not the right fit. If you are on Shopify Plus and want to unlock the full power of your checkout, this is precisely what you need.
**Why Zinn Digital:**
Zinn Digital is a London-based digital development team specialising in Shopify Plus solutions. The focus is on building sustainable, scalable custom functionality that goes beyond what off-the-shelf apps can offer. Every Zinn is crafted with precision, delivered with clarity, and supported through clear communication via the order manager throughout the project.
Ready to transform your checkout into a conversion engine? Select the package that matches your scope and let's build something that genuinely moves the needle for your business.
Zinner Quality Guarantee
Every Zinner is reviewed and approved before joining the platform.
All services are backed by our quality assurance commitment.
Your payment is protected until you approve the delivered work.
Compare Packages
| Feature | Basic | Boost | Premium |
|---|---|---|---|
| Delivery Time | 14 days | 21 days | 45 days |
| Revisions | 2 | 2 | 2 |
| Custom Shopify app built for your Shopify Plus store | ✓ | ✕ | ✕ |
| Simple Shopify Checkout UI Extension included | ✓ | ✕ | ✕ |
| Functional app integrated with your store | ✓ | ✕ | ✕ |
| 1 extension or page scope | ✓ | ✕ | ✕ |
| 2 rounds of revisions | ✓ | ✓ | ✓ |
| Delivered in 14 days | ✓ | ✕ | ✕ |
| Everything in Basic, with greater functional complexity | ✕ | ✓ | ✕ |
| Advanced Checkout UI Extensions or Shopify Functions implementation | ✕ | ✓ | ✕ |
| Suitable for discount logic, shipping rules, or payment customisation | ✕ | ✓ | ✕ |
| Expanded app scope beyond a single basic extension | ✕ | ✓ | ✕ |
| Delivered in 21 days | ✕ | ✓ | ✕ |
| Everything in Boost, with full end-to-end custom build | ✕ | ✕ | ✓ |
| Sophisticated Shopify Functions and Checkout UI Extensions combined | ✕ | ✕ | ✓ |
| Third-party system integration and regulatory compliance support | ✕ | ✕ | ✓ |
| Comprehensive checkout customisation aligned to your brand identity | ✕ | ✕ | ✓ |
| Delivered in 45 days | ✕ | ✕ | ✓ |
Portfolio
Examples of the seller's work related to this Zinn.
Build a Custom Shopify App for Your Shopify Plus Store
Build a Custom Shopify App for Your Shopify Plus Store
Extra Information
Why Choose Me
Perfect For
My Process
Frequently Asked Questions
Yes, absolutely. Shopify Functions and Checkout UI Extensions are features available exclusively to Shopify Plus merchants. If your store is on a standard Shopify plan, this service is not compatible. Please browse other listings for standard Shopify solutions.
Once you place your order, you'll be asked to share your Shopify store URL, relevant login credentials or collaborator access, and any design briefs, brand guidelines, or functional requirements. The more context you provide, the faster we can get started. If we need anything additional, we'll reach out via the order chat.
Each package includes 2 rounds of revisions. After we deliver the initial build, you review it and provide consolidated feedback. We implement the changes and deliver the revised version. Revisions cover amendments within the agreed scope — not new features or significant scope changes.
A Shopify Checkout UI Extension is a custom-built component that allows you to display bespoke content, offers, upsells, compliance notices, or branded elements within the Shopify Plus checkout flow. It runs natively within the checkout without third-party workarounds, and is only available on Shopify Plus.
Yes. These are achievable through Shopify Functions, which allow custom backend logic to be applied to discounts, shipping, and payments at the checkout level. This capability is covered in the Boost and Premium tiers, where the scope allows for more complex functional requirements.
Every project is slightly different. If you're unsure which package fits your needs, message before ordering with a brief description of what you'd like to achieve. We'll advise on the right tier or whether a custom arrangement is more appropriate.
The completed custom app will be delivered directly to your Shopify Plus store. You'll receive confirmation through the order manager once everything is live and functioning. A written technical handover document is available as an optional add-on if you require documentation for your team.
Customer Reviews
See what our customers say about this Zinn
Only logged in customers who have purchased this product may leave a review.
