Progressive Web Apps (PWAs) are web applications that use modern browser capabilities to deliver app-like experiences — including offline access, push notifications, home screen installation, and fast performance — without requiring users to download anything from an app store. For Indian businesses targeting mobile-first audiences on varying network connections, PWAs offer a compelling alternative to native apps.
What Makes a Web App a Progressive Web App?
A PWA is not a specific technology but a set of standards and patterns. The core requirements are:
- HTTPS — served over a secure connection (mandatory for service workers)
- Web App Manifest — a JSON file declaring app name, icons, theme colours, display mode, and start URL
- Service Worker — a JavaScript file that runs in the background, enabling offline caching, push notifications, and background sync
- Responsive design — works on any screen size from mobile to desktop
- Progressive enhancement — works for every user regardless of browser capabilities, with enhanced features for modern browsers
When these criteria are met, browsers like Chrome offer an “Install” prompt, and the app can run in a standalone window like a native application.
Why Are PWAs Especially Relevant for the Indian Market?
India’s mobile landscape makes PWAs particularly attractive:
- Low storage devices — many users have phones with limited storage; PWAs are typically under 1 MB versus native apps that can be 50-200 MB
- Variable connectivity — service workers cache critical assets, enabling offline or low-bandwidth access in areas with spotty coverage
- Data costs — PWAs consume far less data than native apps for initial access and updates
- No app store barriers — users access PWAs via a URL without Play Store/App Store downloads, reducing friction
- Instant updates — updates deploy immediately without user action, unlike native apps that require manual updates
How Do Service Workers Enable Offline Functionality?
Service workers are the core technology powering PWA capabilities:
- Registration — your JavaScript registers a service worker file that the browser installs in the background
- Caching strategies — the service worker intercepts network requests and can serve cached responses:
- Cache first — serve from cache, fall back to network (best for static assets)
- Network first — try network, fall back to cache (best for dynamic content)
- Stale while revalidate — serve cache immediately, update cache from network in background (good balance)
- Background sync — queue actions (form submissions, data saves) when offline and replay them when connectivity returns
- Push notifications — receive and display notifications even when the browser is closed
What Can and Cannot PWAs Do Compared to Native Apps?
| Capability | PWA | Native App |
|---|---|---|
| Offline access | Yes (service workers) | Yes |
| Push notifications | Yes (Android, desktop; limited on iOS) | Yes |
| Home screen install | Yes | Yes (via app store) |
| Camera and microphone | Yes (web APIs) | Yes |
| Bluetooth and NFC | Limited (Web Bluetooth, Web NFC) | Full access |
| File system access | Limited (File System Access API) | Full access |
| Background processing | Limited | Full access |
| App store distribution | Via TWA/PWABuilder for Play Store | Native |
| iOS support | Good but limited (no push until iOS 16.4+, no badging) | Full |
How Do You Build a PWA Step by Step?
- Start with a responsive web application — ensure your site works well on mobile with proper viewport, touch targets, and performance
- Add HTTPS — obtain an SSL certificate (free via Let’s Encrypt) and enforce HTTPS
- Create a Web App Manifest — define your app’s name, icons (multiple sizes), theme colour, background colour, display mode (standalone), and start URL
- Implement a service worker — use Workbox (Google’s library) for simplified caching strategies rather than writing raw service worker code
- Design offline experiences — create an offline fallback page and cache critical navigation paths
- Test with Lighthouse — use Chrome DevTools Lighthouse audit to verify PWA criteria compliance
- Deploy and monitor — track installation rates, offline usage, and performance metrics
Can existing websites be converted to PWAs?
Yes. Adding PWA capabilities to an existing website is incremental. Start by adding a manifest file and a basic service worker that caches static assets. This gives you the install prompt and offline support for cached pages without rebuilding your entire site. WordPress plugins like PWA for WP can automate this process.
Do PWAs work on iPhones and iPads?
Safari supports core PWA features including service workers, offline caching, and home screen installation. Starting with iOS 16.4, Safari also supports push notifications for installed PWAs. However, some limitations remain compared to Android: no install prompt (users must manually “Add to Home Screen”), limited background processing, and periodic service worker eviction on unused apps.
Are PWAs good for e-commerce in India?
PWAs are excellent for Indian e-commerce. They load faster on slow connections, work offline for browsing previously viewed products, and eliminate the friction of app store downloads. Major Indian companies have adopted PWA strategies to improve mobile engagement, especially targeting users on budget smartphones with limited storage and data plans.
How do PWAs affect SEO?
PWAs are regular web pages at their core, fully indexable by search engines. The improved performance (faster load times, better Core Web Vitals) from service worker caching can positively impact rankings. Ensure your PWA uses server-side rendering or static generation so content is available to crawlers, not hidden behind client-side JavaScript rendering.
