Progressive Web Apps Guide

Building Modern Web Apps That Work Offline and Feel Native

Progressive Web Apps (PWAs) combine the best features of web and mobile applications. They're reliable, fast, and engaging web experiences that work offline, load instantly, and can be installed on users’ devices. PWAs use modern web capabilities to deliver app-like experiences directly through the browser.

Background Sync allows PWAs to defer actions until the user has a stab

Background Sync Example

PWAs can prompt users to install the app on their device. The beforeinstallprompt event allows you to control when and how this prompt appears.

live demo · related simulation● LIVE

Installation via "Add to Home Screen" works

Offline functionality works

Limitations: No push notifications (until iOS 16.4), limited storage quota, no background sync, some APIs restricted

Frequently asked questions

What is a Progressive Web App?

A Progressive Web App (PWA) is a modern web application that uses modern web capabilities to deliver app-like experiences directly through the browser. They are designed for reliability, fast loading times, and offline functionality.

How does Background Sync work in PWAs?

Background Sync allows PWAs to defer actions until the user has an internet connection, ensuring a smoother experience even when connectivity is intermittent. This is typically achieved using the beforeinstallprompt event.

What are the limitations of installing a PWA?

While PWAs offer many benefits, they have some limitations compared to native apps, including the inability to use push notifications (prior to iOS 16.4) and restrictions on storage quota and certain APIs.

▶ Try it live

Everything above runs in your browser — open Hash Function Avalanche Visualizer and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Hash Function Avalanche Visualizer simulation