Shopify Custom App Development — Bespoke Shopify App for Your Specific Requirements | £2,997–£9,997 | By Design UK

No existing Shopify app does exactly what you need. We build a custom private Shopify app built specifically for your store — extending Shopify's functionality beyond what themes and public apps can achieve.

✅ What's Included

• 🔧 Custom App Architecture — Full custom Shopify app built to your exact specification using Shopify's official API and app framework
• ⚡ Shopify Functions — Custom discount logic, shipping rules, payment customisation and checkout extensions built with Shopify Functions
• 🛒 Checkout Extensions — Custom checkout UI components, upsell blocks, custom fields and checkout customisation beyond standard theme capabilities
• 🔗 Admin UI Extensions — Custom admin panels embedded directly in Shopify admin for managing your custom functionality
• 🌐 Storefront API Integration — Custom storefront experiences built on Shopify's Storefront API
• 🔄 Webhook Processing — Real-time event processing for orders, customers, products and inventory with reliable webhook handling
• 🔐 Secure Installation — OAuth app installation flow, proper API key management, GDPR-compliant data handling
• 🧪 Full Testing Suite — Comprehensive testing across all app functions before deployment
• 📋 Full Documentation — Technical documentation and operational guide for your team
• 🔧 30-Day Post-Launch Support — Bugs and issues resolved at no additional cost in the first 30 days