PWA Agile Estimation Tool: Planning Poker That Works Offline
Spotty WiFi drops participants mid-vote. Mobile networks flake during remote sessions. Progressive Web Apps work offline with service workers, syncing when connection returns. Never lose estimation progress to connectivity issues.
The Offline Problem
- Coffee shop WiFi: Drops every 5 minutes
- Mobile hotspot: Switches between 4G and 5G, brief disconnect
- Remote locations: Working from cabin with satellite internet
- VPN flakiness: Corporate VPN reconnects, kills session
Standard web apps: Connection drop = lost vote state, reload page, "Session not found."
How PWAs Enable Offline Estimation
Service Worker Technology
PWA service workers cache app shell locally. When offline:
- App continues functioning from cache
- Votes stored in IndexedDB locally
- When online, syncs queued actions to server
- Seamless experience, no reload required
Optimistic UI Updates
Your vote appears instantly (optimistic), syncs in background. If sync fails, retries automatically when connection recovers.
PWA Features for Estimation
- Install to home screen: Acts like native app
- Offline voting: Continue estimating during disconnections
- Background sync: Auto-syncs when connection returns
- Fast load times: Cached shell loads instantly
- Works on 2G/3G: Minimal bandwidth needed
Testing Offline Capability
Browser DevTools test:
- Open estimation tool
- Chrome DevTools → Network tab → Throttling → Offline
- Try voting on story
- Check if vote persists when online again
Pass: Vote saved locally, syncs when online
Fail: "Network error" message, vote lost
Start Offline-Ready Estimation
Alignlee built as PWA with full offline support and background sync.