App vs Website: What's the Difference?
A website runs inside a browser and looks the same on any device; an app is installed on your device, can work offline, and gets deeper access to its hardware.
Think of it like this
A website is like borrowing a book from the library every time you want to read it — you visit, read a page, and hand it back. An app is like buying your own copy: it lives on your shelf (installed on your device), and you can pick it up any time, even without an internet connection.
What's happening
Summary
Websites and apps often do similar jobs, but a website runs through a browser and needs no installation, while an app lives on your device, can work offline, and can reach deeper into its hardware.
A Closer Look
The technical difference comes down to where the code runs and what it's allowed to touch. A website's code is downloaded fresh (or cached) each time you visit and runs inside the browser's sandbox — a deliberately restricted environment that limits what a random website can do to your device, for safety. An app's code is installed ahead of time and, once you've granted permission, can reach much further: your camera, your contacts, your location, background processing, and storage.
The line has blurred over time. Progressive Web Apps let a website behave much more like an app — added to your home screen, working offline, sending notifications — while still being built and updated like a website. Many companies build both because each has strengths: a website reaches anyone instantly with no install step, while an app gives a smoother, more capable experience to people willing to install it.
Common Misconceptions
- An app isn't automatically safer than a website — app stores review submissions, but malicious apps still slip through sometimes, and a browser's sandboxing is itself a strong safety layer for websites.
- A website doesn't have to be basic or slow — modern websites can be just as interactive as an app, and some can even work offline and be installed like one.
- Not every app needs an app store — some are installed directly from a developer's website, and Progressive Web Apps are installed straight from the browser.
How it connects
App vs Website builds on ideas covered elsewhere on this site:
Try it yourself
Open a site like web.whatsapp.com or your bank's website, then compare it to that same company's app. Notice what the app can do that the website can't — like sending you a notification while it's closed.