What Are Progressive Web Apps?
Progressive Web Apps combine the reach of websites with the experience of native apps. PWAs offer offline capability, push notifications, home screen installation, and fast app-like interactions — all through the browser without App Store distribution.
PWA Benefits for Ecommerce
Speed and Performance
Service workers cache assets and data locally, enabling near-instant page loads on repeat visits. Pre-caching key resources eliminates network latency for critical paths. Combined with our speed optimisation, PWA can deliver native-app-like performance.
Offline Browsing
Customers can browse products, view their cart, and save wishlists even without network connectivity. When connectivity returns, pending actions sync automatically. This is particularly valuable for mobile shoppers with intermittent connections.
Push Notifications
Re-engage customers with timely push notifications — back-in-stock alerts, price drops, order updates, and promotional offers. Push notifications achieve significantly higher engagement rates than email, making them powerful for marketing campaigns.
Home Screen Installation
Customers can add your store to their home screen with a single tap. The store opens full-screen without browser chrome, creating a native app experience. Installed PWAs see 3-4x more engagement than browser visits.
PWA on Shopify
Limitations with Standard Themes
Shopify’s hosted platform restricts service worker scope, making full PWA implementation challenging on standard themes. You can implement basic PWA features — manifest file, minimal offline page, and home screen prompt — but full offline capability requires workarounds.
Headless PWA
Full PWA functionality is achievable with headless architecture. Using Hydrogen or Next.js, you control the service worker, caching strategy, and offline experience completely. This is the recommended approach for production PWA implementations.
PWA Apps
Apps like Vajro and Appmaker provide PWA functionality on top of standard Shopify themes. They handle the service worker configuration, offline pages, and push notification infrastructure without requiring headless migration.
Core PWA Technologies
Service Workers
JavaScript files that intercept network requests and serve cached responses. Implement caching strategies — cache-first for static assets, network-first for dynamic product data, stale-while-revalidate for balanced freshness and speed.
Web App Manifest
JSON file defining the app name, icons, theme colours, and display mode. This enables the “Add to Home Screen” prompt and controls how the app appears when launched from the home screen.
Cache API
Store and retrieve network responses for offline access. Pre-cache essential pages during service worker installation. Runtime cache product images and API responses as users browse. Manage cache size to prevent storage issues on mobile devices.
Measuring PWA Impact
- Installation rate: Percentage of visitors who install the PWA
- Push notification opt-in: Subscription rate and engagement
- Return visit frequency: How often installed users return
- Conversion rate: Compare PWA users vs regular visitors
- Offline usage: How often customers browse offline
Is PWA Right for Your Store?
PWA makes sense for stores with strong mobile traffic, repeat customers, and markets with variable connectivity. For most Shopify stores, a well-optimised custom theme delivers excellent mobile performance without PWA complexity.
Interested in PWA for your store? Evaluate your options with our technical team.
