Glyph Hub
A real-time collaborative to-do app for Android and iPhone — shared lists that sync instantly, with a subscription model built in.
Timeline
3 months
Team Size
2 engineers
Industry
Productivity
Tech Stack
The Problem We Solved
Shared task lists break down the moment two people edit at once — someone's update disappears, or the list drifts out of sync between devices. Families and small teams needed a to-do list that felt as reliable as a private notes app, but updated everywhere the instant someone made a change.
The Complexity — Real-Time Sync Without Conflicts
Collaborative editing across multiple devices means resolving simultaneous changes without silently dropping one. On top of that, the app needed a working subscription system for premium features and a polished light/dark experience across both platforms.
- Real-time Firestore sync across every collaborator device
- Conflict-safe updates for simultaneous edits
- In-app purchase subscriptions via Play Store and App Store
- Light and dark themes tuned for daily use
The Solution — Flutter + Firebase Realtime Sync
Flutter delivers one codebase across Android and iOS, with Firebase Firestore powering real-time listeners so every collaborator sees changes the instant they happen. A Node.js/TypeScript layer validates subscription state so premium features stay in sync with billing.
Feature Showcase
Shared Lists, Instant Sync
Add a task and everyone on the list sees it appear immediately — no refresh, no merge conflicts.
Light & Dark Modes
A theme for every time of day, switchable in one tap and consistent across the whole app.
How We Made It Simple
Add a task, invite a collaborator, done — sync happens silently in the background. Subscribing to premium features takes one tap through the platform billing sheet users already trust.
Tech Stack
Gallery
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