Progressive Web App (PWA)
A Progressive Web App (PWA) is a web application that behaves like a native app: it can be installed on the home screen, works offline and supports push notifications – yet is delivered through the browser without app store publication. PWAs are built on web standards like Service Workers and require a valid SSL Certificate . For businesses, PWAs are a cost-effective alternative to separate iOS and Android apps.
Why PWA instead of a native app?
Native apps require separate codebases for iOS and Android, app store approvals and regular updates. PWAs use a single codebase and are distributed via URLs. They are always up to date, require no download and work on all platforms. For Web Apps with a broad target audience and a limited budget, a PWA is often the more economical solution.
Technical foundations of a PWA
Service Worker: a JavaScript process that runs in the background, intercepts network requests and enables offline caching. Web App Manifest: a JSON file that defines name, icons, colors and start behavior. HTTPS: mandatory for Service Workers – a valid SSL Certificate is a prerequisite. Responsive Design : PWAs must function on all screen sizes. Together, these technologies enable an app-like experience in the browser.
PWA and performance
Service Workers enable aggressive Caching : static assets, API responses and entire pages can be cached locally. This drastically improves Load Time – especially on repeat visits or unstable network connections. Combined with Lazy Loading and Critical CSS , PWAs achieve excellent Core Web Vitals scores.
Limitations of PWAs
Not all native features are available via Web APIs: Bluetooth access, NFC and deep OS integration are limited. iOS supports PWA features with some delay. For highly specialized apps with hardware access, native development remains necessary. For most business applications, dashboards and content platforms, however, PWAs are more than sufficient.
How we use it
At BTECH Solutions, we evaluate PWA features on a project-by-project basis: for booking systems and PMS applications, we implement Service Workers with a stale-while-revalidate strategy so users can continue working even on unstable connections. Angular offers native PWA support via @angular/pwa. For pure content websites, we often recommend Static Site Generation instead of PWA – the added value of offline caching is minimal for informational sites. The decision depends on the specific use case, not the hype.