What is Progressive Web App (PWA)?
A website that looks and behaves like a mobile app but is built using common web technologies.
Deep Dive
PWAs utilize APIs to deliver native-like capabilities (push notifications, offline work) while still being linkable and indexable like a website.
They are a cost-effective alternative to building separate iOS and Android native apps.
Key Takeaways
- Installable on home screen without App Store.
- Works offline or on low-quality networks.
- Fast, reliable, and engaging.
- Examples: Twitter Lite, Starbucks, Uber.
Why This Matters Now
For years, you had two choices: build a Website (accessible but limited) or build a Native App (powerful but expensive to install).
PWA is the middle ground. It's a website that 'levels up' when opened on a mobile. It can save itself to your home screen, send you push notifications, and even work when you are on an airplane.
Common Myths & Misconceptions
Apple (iOS) doesn't support them.
Reality:They do, just reluctantly. You can install PWAs on iOS, but they don't have *full* access to every hardware feature (like Bluetooth) yet.
It's just a responsive website.
Reality:No. A responsive site needs the internet. A PWA has a 'Service Worker'—a script that runs in the background and caches files so the app loads instantly, offline.
Real-World Use Cases
Emerging Markets: Twitter Lite was built as a PWA for users with slow 2G/3G connections and expensive data plans.
E-commerce: Starbucks' PWA lets you browse the menu and customize your drink without internet, then sends the order when you reconnect.
Frequently Asked Questions
Do I need an App Store account?
No! That's the best part. No 30% Apple tax, no 'Review Process'. You publish updates instantly to your server.
Can it access the camera?
Yes, modern web APIs allow PWAs to access Camera, GPS, Microphone, and even Biometrics (FaceID).
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