Blazor WASM can be configured as a Progressive Web App (PWA), enabling offline support, installability, and background sync — without App Store distribution.

Enabling PWA at Project Creation

dotnet new blazorwasm --pwa -o MyPwaApp

What Gets Added

• wwwroot/manifest.json — app name, icons, start URL, display mode
• wwwroot/service-worker.js — base service worker
• wwwroot/service-worker.published.js — production service worker with pre-caching

How Offline Works

The production service worker pre-caches all app assets at install time. Subsequent visits load entirely from cache — no network required.

Updating

When you publish a new version, the service worker detects the change and prompts the user to refresh. Handle this in service-worker.published.js.

Testing PWA Features

• Use Chrome DevTools → Application → Service Workers to inspect
• The Install prompt appears automatically when PWA criteria are met
• Test offline by toggling offline in DevTools → Network

Reference:

Wikipedia: Progressive Web Application

https://en.wikipedia.org/wiki/Progressive_web_application