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DuelSync

Two phones. One referee. Sixty ways to lose gracefully.

Not yet on Google Play — in active development

Camera, motion, microphone and two-phone gameplay exist at the infrastructure level and are excluded from verified ranked play until physical-device testing completes.

About DuelSync

DuelSync is a party game with an engineering heart: a reusable challenge engine, a versioned match protocol and a catalogue of 60 data-driven challenges spanning reaction, tapping, memory, logic, word play, drawing and hidden-timer duels. Play pass-and-play on one phone today; the Nearby point-to-point transport for true two-phone matches is built and being verified on physical devices. On-device ML Kit face analysis, sensors and audio are wired at the infrastructure level — and stay out of ranked play until they earn their way in through testing.

Key features

60 data-driven challenges across seven duel types
Pass-and-play on one phone or point-to-point on two
Versioned match protocol with an impartial referee
On-device ML Kit face challenges — nothing uploaded
Capability-aware challenge library
Fully offline with no accounts

In pictures

Illustrative development previews — genuine screenshots will appear here as the app matures.

Development preview artwork — not an app screenshot.

The referee is incorruptible
Every DuelSync challenge runs on a deterministic engine with a versioned protocol, so neither phone — and neither sibling — can argue with the result.

Development status

DuelSync is roughly 80% of the way to its first public release. It will appear on Google Play when it's genuinely ready.

Privacy & practical details

Privacy at a glance

DuelSync plays offline. Matches travel phone-to-phone over Nearby connections; camera and microphone challenges are processed on-device and nothing is uploaded.

Full privacy information for DuelSync

Permissions

Bluetooth and Nearby devices: Links two phones directly for head-to-head matches. No internet involved.
Location: Required by Android for Bluetooth scanning on older versions. DuelSync does not track where you are.
Camera: Powers face-analysis party challenges. Processing is on-device via ML Kit.
Microphone: Powers sound-based challenges. Audio is analysed on the device.
Vibration: Haptic feedback during duels.