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Web Apps and PWAs: When You Do Not Need to Install Anything

Many services work just as well in the browser, and some can be added to your home screen like an app. Here is how that works and when it is the safer choice.

What a PWA is

A progressive web app, or PWA, is a type of application delivered through the web and built with ordinary web technologies, but designed to behave more like an installed app. You can add it to your home screen, it opens in its own window without the browser bar, and it can sometimes work offline.

How it works underneath

Much of the app-like behaviour comes from a service worker, a script that the browser runs in the background for a website. It can cache pages so they load without a connection and, with your permission, deliver notifications. A small manifest file tells the browser the app's name, icon and how it should open.

Why a web app can be the safer choice

  • The browser sandbox. Websites run inside the browser's protections and generally cannot reach your files, messages or other apps.
  • Fewer and clearer permissions. Camera, location and notifications are requested one at a time, by that site, and can be revoked in the browser.
  • Always current. You load the latest version each time, with no outdated copy left sitting on the phone.
  • Easy to verify. The address bar shows exactly which domain you are on, something an installer file never tells you.

What web apps cannot do as well

Some features remain easier for installed apps, such as deep integration with the system, certain background tasks and some hardware access. Support for PWA features also varies between browsers and operating systems, so a PWA may behave a little differently on different phones.

Adding one to your home screen

  1. Open the site in your browser and check the address carefully.
  2. Use the browser menu option to install the app or add it to the home screen.
  3. Open it from the new icon and sign in as usual.

To remove it, delete the icon or uninstall it like an app, and clear the site's data in the browser if you want everything gone.

A sensible default

When a service asks you to download an installer file, check first whether its website does the job. If it does, the website is usually the lower-risk route.

Web apps can still be fake. The address bar is your developer line: read it before you sign in.

Version checked 2026-11-09 · Rafael Duarte