PWAs give you app-like functionality without the App Store. Here’s when they make sense — and when a traditional website is enough.
What a PWA Actually Is
A Progressive Web App is a website that behaves like a mobile app: installable to the home screen, works offline, sends push notifications, runs full-screen without browser chrome. It’s built with web technologies (HTML, CSS, JS) and delivered via the browser — no App Store approval, no native code. Installs in one tap, updates automatically, works cross-platform.
When a PWA Wins
PWAs shine when you need: app-like UX without App Store friction, offline access (field service workers, travel, retail floor staff), push notifications, fast repeat visits. Businesses that benefit most: ecommerce (re-engagement), news/media, SaaS with power users, field-service apps, internal tools. Examples: Starbucks PWA doubled daily active users, Tinder’s PWA loads in 4 seconds vs 11 for native, Pinterest PWA increased core engagement 60%.
When PWA Isn’t the Answer
PWAs don’t match native for: heavy 3D/graphics (games), camera-intensive applications, deep hardware access (Bluetooth peripherals, accelerometer-driven experiences), apps that need App Store discoverability as a customer acquisition channel. iOS support lags Android — some features (push on iOS, full home-screen install parity) aren’t as polished. For most B2B and ecommerce use cases, PWA is more than enough; for consumer-oriented flagship apps, native is often worth the cost.
Core PWA Technologies
Service Worker: JavaScript that runs in the background, intercepts network requests, caches assets, handles push notifications. Web App Manifest: JSON describing the app (name, icons, colors, display mode) so browsers offer install prompts. HTTPS: required — no PWA features work over HTTP. Workbox: Google’s library simplifying service worker development; handles 90% of common caching patterns.
Offline Strategy
‘Offline’ doesn’t mean everything works when disconnected. Pick: (1) cache-first for static assets (CSS, JS, images), (2) network-first for dynamic content (newsfeeds, search results), (3) stale-while-revalidate for the middle ground. Serve a clean ‘offline’ fallback page for pages the user hasn’t cached yet. Good offline UX is about graceful degradation, not full feature parity — users forgive missing data; they don’t forgive errors.
Measuring PWA Performance
Key metrics: install rate (how many visitors accept the install prompt), repeat engagement of installed users (typically 2–3x non-installed), push notification opt-in rate, offline usage stats. Lighthouse has a dedicated PWA audit that scores manifest, service worker, installability, and offline capability. Target 90+ on the PWA audit. Successful PWAs see measurable business impact within 3 months — if they don’t, the app portion of your audience may not need it.
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