Shopify App Development — Custom Apps & Extensions
From public App Store products to private internal tools, from theme app extensions to checkout UI — built on Shopify's own stack: Remix, Polaris and Functions.
Why Shopindev?
Public App Store apps
Fully compliant with App Bridge, Polaris, OAuth, webhooks and Shopify's review requirements.
Private custom apps
Built for your store only — bespoke workflows, ERP integrations and internal tooling without App Store constraints.
Theme app extensions
App blocks that merchants place through the theme editor, the modern Shopify 2.0 standard.
Checkout UI extensions
Custom fields, badges and validation inside checkout for Shopify Plus stores.
Shopify Functions
Discount, shipping and payment logic running at the edge in JavaScript or Rust.
Admin blocks
Custom panels and actions on order, product and customer pages where your team already works.
Delivered in four steps
Requirements
What problem the app solves, which Shopify APIs it needs, plus performance and security requirements.
Stack & infrastructure
Remix, TypeScript, Polaris UI, Prisma and Postgres, wired through the Shopify CLI.
Development & testing
For public apps: App Bridge, OAuth and webhooks. For private: the custom logic only.
Review or install
App Store submission and review for public apps, or a direct install link for private ones.
Frequently asked questions.
How much does a Shopify app cost to build?
A straightforward public app runs £16,000–£34,000; complex builds with ERP integration reach £48,000+. Private custom apps typically land between £11,000 and £44,000.
Public or private app — which do I need?
If it is only for your store, private is faster, safer and less constrained. If you plan to sell it to other merchants, public gives you App Store distribution and revenue.
What do you build with?
Shopify's official stack: Remix on Node.js, TypeScript, Polaris for UI, Shopify CLI, App Bridge, and Prisma with Postgres.
How long is App Store review?
One to two weeks. First submissions rarely pass untouched — usually one or two rounds of fixes. We budget that into the timeline.