- 21
- April
What Is PWA (Progressive Web App)? — Web Apps That Behave Like Native Mobile Apps
The term PWA or Progressive Web App is increasingly common in modern ERP and enterprise systems because it lets users access the system from mobile devices as conveniently as a native app — without going through the Play Store or App Store. This article explains what PWA is, how it works, and why it matters for ERP.
Quick Summary: A PWA is a website built with standard web technologies (HTML, CSS, JavaScript) but designed to deliver an app-like experience — installable on the home screen, works offline, supports push notifications, and loads quickly like a native app. It relies on three core technologies: Service Worker, Web App Manifest, and HTTPS.
What Is a PWA?
A PWA (Progressive Web App) is a concept Google introduced in 2015 by Alex Russell to combine the strengths of a "website" and a "mobile app." The word "Progressive" means the web app works on every browser and gets "smarter" as the browser supports advanced features — for example, on a modern Chrome it becomes installable, while on older browsers it still functions as a normal website.
Many people have used PWAs without realizing it — Twitter Lite, Pinterest, Starbucks, and Spotify Web Player are all PWAs that can be "Added to Home Screen" on mobile and used like apps.
Three Core Technologies That Make a PWA
1. Service Worker
JavaScript running in the background of the browser, separate from the main page thread. It caches files, handles network requests, makes the site load fast, and enables offline operation. It also supports Push Notifications and Background Sync.
2. Web App Manifest
A small JSON file (manifest.json) that tells the browser this site "is an app" — specifying its name, icon, theme color, display mode (fullscreen or standalone), and start URL. When the browser reads this file, it knows to show the user an "Install" button.
3. HTTPS
PWAs require the site to use HTTPS only. Because Service Workers can intercept network requests, full security is mandatory (read more: What Is SSL Grade and How to Check SSL Security).
Key PWA Features
| Feature | Description |
|---|---|
| Installable | Install on a phone's home screen or on a desktop without going through an app store |
| Offline Capable | Continues to work when the network drops, because the Service Worker has cached essential data |
| Push Notification | Sends notifications to users like a native app, even when the browser is closed |
| Responsive | Adapts to every screen size — phone, tablet, desktop |
| Fresh & Auto-update | Users always get the latest version, no need to update from a store |
| Linkable | Can be shared via URL — no download required to start using |
| Discoverable | Indexed by Google Search like any web page, unlike native apps which require app-store discovery |
PWA vs Native App vs Traditional Web App
| Aspect | PWA | Native App | Traditional Web App |
|---|---|---|---|
| Installation | Install directly from the web | Download from App Store / Play Store | Browser only — cannot install |
| Offline | Yes (cached) | Yes (stored on device) | No |
| Push Notification | Yes (via browser) | Yes | No |
| Hardware Access | Limited (camera, GPS, some sensors) | Full (Bluetooth, NFC, etc.) | Very limited |
| Development Cost | Low — single codebase for all platforms | High — separate iOS + Android codebases | Lowest |
| Updates | Automatic on every visit | User must tap Update | Automatic |
| Store Fees | None | 15-30% of revenue | None |
Pros and Cons of PWA
| Pros | Cons |
|---|---|
| One codebase runs on every OS (iOS, Android, Desktop) | More limited mobile hardware access than Native |
| No App Store / Play Store review required | iOS supports fewer PWA features than Android |
| Small footprint, faster to load than Native (MB, not hundreds of MB) | Harder to discover via App Store (lives outside store ecosystems) |
| SEO-friendly because it's a normal website | Requires modern web skills (Service Worker, Manifest) |
| Updates ship without waiting for store approval | Performance for heavy workloads still trails Native somewhat |
Why PWA Matters for ERP Systems
An ERP system that is a PWA unlocks several major benefits for the organization:
- Access from anywhere, on any device — executives view dashboards from their phone while traveling; warehouse staff use tablets while receiving stock — no need to return to a desktop
- Lower development cost — no separate iOS + Android app to fund; a single codebase covers every platform
- Easier deployment — update the ERP once on the server; every user gets the new version instantly without updating their device
- High security — enforces HTTPS and supports OAuth 2.0 and 2FA like any enterprise app
- Offline operation — ideal for field operations where staff record data in areas without signal, then sync when reconnected
Saeree ERP and Web-First Architecture
Saeree ERP is built as a Web Application accessed directly from the browser — no client install required. It uses OAuth 2.0 for authentication, enforces HTTPS at SSL A+ grade, and renders responsively on every screen size — phone, tablet, desktop.
These properties bring Saeree ERP very close to a PWA architecture. Organizations can access the system from any device without installing an app, and avoid the cost of building a separate mobile app — a clear reduction in Total Cost of Ownership.
