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halfmarble // iOS apps

halfmarble on your iPhone.

One wellness app and two games. Everything runs on your device, none of it tracks you, and all of it is built to work with unsteady hands.

Not sure your device can run these? Check first
SteadyHeartBeat app icon

SteadyHeartBeatiPhone + AirPods Pro 3

Your heart rate, read aloud. SteadyHeartBeat speaks your live heart rate from AirPods Pro 3 — no watch, no chest strap, no glancing at a screen. Everything runs on your iPhone, and your data never leaves it.

Open beta · TestFlight App Store release to follow

Needs iPhone · iOS 26+ · AirPods Pro 3 or later

See the app →
ViroFlick app icon

ViroFlickiPhone & iPad game

A casual flick-and-defend arcade type game. Read the pathogen swarming your patient, arm the one cell type that counters it, and flick a homing cell to hold the line.

Open beta · TestFlight App Store release to follow

Needs iPhone or iPad · iOS 17+

See the game →
StringFusor app icon

StringFusoriPhone & iPad game

A casual color-matching puzzle game set in deep space. Steer falling strings of colored pieces, stack them, and build patterns that fuse and release their energy. No timers, no rush, unlimited undo.

Open beta · TestFlight App Store release to follow

Needs iPhone or iPad · iOS 18.6+

See the game →
Before you download

Will these run on your device?

Pick your device and the iOS version you are on. Nothing is sent anywhere — this runs entirely in your browser. Not sure which iOS you have? It is in Settings › General › About › Software Version.

SteadyHeartBeat

iPhone · iOS 26+ · AirPods Pro 3 or later

Pick your device above to check.

ViroFlick

iPhone & iPad · iOS 17+

Pick your device above to check.

StringFusor

iPhone & iPad · iOS 18.6+

Pick your device above to check.

Pick the family — Plus, mini, Pro and Pro Max all take the same iOS as the base model. Device support follows Apple's own compatibility lists for iOS 17, 18 and 26. If your device is not listed, it is older than anything these apps run on.

All three are local-first: no accounts, no ads, no analytics, no third-party SDKs. What happens on your device stays on your device.