Show HN: Bingo Caller Pro – Offline 75/90 Ball Bingo Host
3 comments
Most bingo/tambola caller apps I found either required internet for ads, analytics, or remote syncing. For community halls and senior centers (where this is often used), connectivity is unreliable — and I didn’t want gameplay to depend on network state.
So the app:
Runs fully offline (no API calls during gameplay)
Uses a cryptographically secure RNG for number generation
Doesn’t collect personal data
Doesn’t require account creation
The hex verification system was added after running into disputes during larger games. Instead of manual checking, each card can be validated deterministically against the called sequence, which made competitive sessions much smoother.
If anyone is curious about implementation details (RNG choice, QR card generation approach, state handling, etc.), happy to go deeper.
Also very open to critique — especially around UX clarity for large-screen TV mode.
So the app:
Runs fully offline (no API calls during gameplay)
Uses a cryptographically secure RNG for number generation
Doesn’t collect personal data
Doesn’t require account creation
The hex verification system was added after running into disputes during larger games. Instead of manual checking, each card can be validated deterministically against the called sequence, which made competitive sessions much smoother.
If anyone is curious about implementation details (RNG choice, QR card generation approach, state handling, etc.), happy to go deeper.
Also very open to critique — especially around UX clarity for large-screen TV mode.
What is "Hex-based number verification"?
It started as a simple number generator for family game nights, but evolved into a full hosting tool with:
Professional voice calling (multiple personalities)
TV/projector display mode
Digital player cards via QR
Hex-based number verification to reduce disputes
Rollback for incorrect calls
9 language support
The app works completely offline and uses a secure RNG. No tracking, no data collection.
Would love feedback on usability, performance, or feature ideas.
Google Play Store link: https://play.google.com/store/apps/details?id=com.bingosurf....