Explainers · Tech
What is a PWA? (And How to Install Web Apps on iPhone & Android)
A plain-English guide to progressive web apps: what a PWA is, how PWAs compare to native apps, and exact steps to install one on iPhone and Android.
Trackly Team · 16 October 2026 · 5 min read
What is a PWA?
A progressive web app (PWA) is a website that behaves like an app. You install it from the browser in seconds — no app store, no download queue — and it gets its own icon on your home screen, launches full-screen without a browser address bar, and can work offline because it stores its code and data on your device. From the home screen onward, most people cannot tell the difference between a well-made PWA and a native app.
The "progressive" part means the app earns its powers in layers: the site works in any browser, a better browser unlocks install and offline support, and a modern one adds push notifications. The same single codebase serves everyone — which is why teams from Twitter Lite to Starbucks to Uber built PWAs to reach users that big native downloads were losing.
How to install a PWA on iPhone
- 01Open the website in Safari — this only works in Safari; Chrome and other browsers on iOS cannot install web apps (an iOS limitation)
- 02Tap the Share button — the square with an arrow pointing up, at the bottom of the screen or next to the address bar
- 03Scroll down and tap "Add to Home Screen"
- 04Confirm the name and tap Add — the app's icon appears on your home screen like any other
- 05Launch it from the icon — it opens full-screen, with no browser UI, exactly like a native app
One iOS quirk worth knowing: notifications from PWAs require iOS 16.4 or later and only arrive after the app is installed to the home screen. Everything else — offline use, full-screen mode, the app icon — works on any recent iOS version.
How to install a PWA on Android
- 01Open the website in Chrome (or Edge, Brave, or Samsung Internet)
- 02Tap the menu — the three dots in the top-right corner
- 03Tap "Install app" or "Add to Home screen" (the label varies by browser)
- 04Confirm — the icon lands on your home screen and the app may also appear in your app drawer
Android also shows an "Install" button directly in Chrome's address bar on sites that support installation, which makes the process even shorter. Android PWAs additionally get full notification support from the start.
PWA vs native app
| PWA | Native app | |
|---|---|---|
| Install time | Seconds, from the browser | Minutes, via an app store |
| Storage used | Often under 5 MB | Commonly 100–500 MB |
| Updates | Instant — always the latest version | App store review, manual updates |
| Offline support | Yes, via service workers | Yes |
| Push notifications | Android always; iOS 16.4+ | Yes |
| Store fees | None | 15–30% on purchases |
| Deep device access | Limited | Full |
For everyday apps — trackers, notes, lists, tools — a PWA is usually the better deal for both sides: users get a fast install and a tiny footprint, and developers ship updates instantly instead of waiting for store review. Native still wins when an app needs deep hardware access: heavy games, camera suites, background sensors. If you are choosing for a to-do or expense app, the PWA route has essentially no downside.
Trackly itself is a PWA — try it at trackly.today/install: install to your home screen in about 30 seconds, no store visit, no download wait.
Why companies ship PWAs
Twitter's Twitter Lite was the famous early proof: the PWA used a fraction of the native app's data and storage, and engagement went up — because the biggest drop-off for the native app had been the download itself, not the experience after it. The same logic drives Starbucks, Uber and Pinterest's web apps: remove the install barrier, and more people actually arrive inside the product.
For users, the takeaway is simpler: next time a site you like offers "Add to Home Screen", try it. You get an app-shaped experience with none of the download, and — unlike a store app — the URL you installed from is the whole app, always current.
Frequently asked questions
Is a PWA as good as a native app?
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For most everyday apps — trackers, notes, lists, tools — yes: a well-made PWA is visually indistinguishable from a native app, installs in seconds, uses far less storage, and updates instantly. Native apps still matter for heavy 3D games, advanced camera features and background sensor access. If your use case is a to-do list or expense tracker, a PWA has effectively no downside.
Do progressive web apps work offline?
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Yes. PWAs use a service worker — a small script the browser keeps on your device — to cache the app's interface and data locally. You can open the app, view what you saved, and add new entries with no internet connection; changes sync once you are back online. Trackly, for example, is fully usable in airplane mode.
How do I install a PWA on my iPhone?
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Open the website in Safari (this only works in Safari on iOS — Chrome cannot install web apps there). Tap the Share button, scroll down and choose "Add to Home Screen", then confirm. The app gets its own icon, launches full-screen like a native app, and works offline. The whole process takes about 30 seconds.
Try Trackly — it's free.
Expenses, habits, tasks, notes and group splitting — one app, works offline, installs in 30 seconds.