Shopify Functions
Custom discounts, cart transforms, bundles, checkout validation, and delivery and payment rules that run inside Shopify.
Custom Shopify app development
Custom Shopify
apps.
When an app from the App Store can't do what your business needs, we build one that can: on Shopify's own platform, so checkout, inventory and fulfillment keep working.
- We build
- Custom & public Shopify apps
- Platform
- Functions, checkout & admin extensions
- Integrations
- ERP, 3PL, CRM, Klaviyo, Recharge
- After launch
- Maintenance & support
When you need a custom Shopify app
Most stores run on a stack of App Store apps, and that's fine until one of them can't handle how your business works. The usual signs: three apps duct-taped together to fake one feature, staff working around Shopify in spreadsheets, or a checkout rule no app supports.
A custom app solves the actual problem. We build on Shopify's own extension points (Functions, checkout UI extensions, admin UI extensions and the Admin API) so the result behaves like part of Shopify, not a layer on top that breaks at checkout.
What we build
Where custom apps earn their keep.
Checkout extensions
Custom fields, upsells, messaging and logic in checkout and on the thank-you and order status pages.
Admin UI extensions
Tools for your staff right inside Shopify admin, like the kit-aware order editor in our case study.
Read the case study →ERP, 3PL & CRM integrations
Orders, inventory and customers kept in sync with the systems your operations run on.
Bundles, kits & subscriptions
Configurable products and subscription logic that keep inventory and fulfillment accurate, often with Recharge.
Internal tools
Bulk editors, reporting and workflow automation for the jobs your team now does by hand.
Case study: configurable kits on Shopify
An automotive parts retailer moving from WooCommerce needed to sell kits of forty or more parts that customers configure. We built a Cart Transform so each kit shows as one line with the right price, a kit-aware order editor inside Shopify admin, and packing slips and invoices that stay readable, while every part stays a real line item for inventory and fulfillment. Read the full case study.
Shopify or Shopify Plus?
Some app features depend on your plan. Custom apps that use Shopify Functions, and checkout extensions on the information, shipping and payment steps, require Shopify Plus. We'll tell you up front what your plan supports, and design around it if upgrading doesn't make sense.
Need theme work alongside the app? See Shopify theme development.
How an app build runs.
- 01
Map the workflow
We trace the whole lifecycle (purchase, edit, fulfillment, returns), not just the happy path.
- 02
Spec & feasibility
A written spec with what Shopify allows, the risks and the trade-offs, before code.
- 03
Build
Two-week cycles with demos on a development store, then on yours.
- 04
Launch & maintain
Monitored rollout, documentation, and support as Shopify's APIs change.
Questions
App development questions.
Use an App Store app when one does the job well. Build custom when your workflow is specific to your business, when several apps are being combined to fake one feature, or when the monthly fees add up to more than a build.
Not always. Many custom apps work on any plan. Custom apps that use Shopify Functions, and checkout extensions on the information, shipping and payment steps, require Shopify Plus.
You do. A custom app is installed on your store, and the code is yours.
Yes. We build integrations with ERPs, 3PLs and CRMs through their APIs, and with tools like Klaviyo and Recharge.
Shopify versions its APIs and retires old versions on a schedule. We offer maintenance so your app is updated before anything breaks.
Often, yes. We review the code first and tell you whether it's worth extending or safer to rebuild.
Hit the limit of off-the-shelf apps?
Tell us what your store needs to do. We'll tell you what Shopify allows, the best way to build it and what it'll take.