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halfmarble // apps

halfmarble on your iPhone and Mac.

For iPhone: one wellness app, two games and an offline road-trip companion, all built to work with unsteady hands. For the Mac: a menu-bar monitor, free or paid. Everything runs on your device, and none of it tracks you.

Not sure your iPhone or iPad can run these? Check first ↓
iPhone & iPad
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.

Free to download

Needs iPhone or iPad · iOS 17+

On the App Store ↗ 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.

Free to download

Needs iPhone or iPad · iOS 18.6+

On the App Store ↗ See the game →
DashTales app icon

DashTalesiPhone app

Offline entertainment for the whole car, hands-free. Books, games, stories and simple conversation — you talk to it, so no hands are involved. Everything lives on the phone, so it keeps working where there is no signal at all.

In development · details subject to change

Needs iPhone 15 Pro or newer · iOS 18+ — the AI runs on the phone’s own GPU

See the app →
Mac
cpuTopBars app icon

cpuTopBarsMac menu-bar app

Your Mac's load at a glance: live bars in the menu bar for CPU and every core, GPU, Neural Engine, memory, disk, battery and Wi-Fi, with your top processes one click away. Read on your Mac; nothing is sent.

Free · open source (MIT) ↗ Mac App Store release to follow

Needs Mac · macOS 27+

Join the beta on TestFlight ↗ See the app →
devTopBars app icon

devTopBarsMac menu-bar app

The paid app built on cpuTopBars. Everything it shows, plus bars for an AI coding plan's usage limits and each live session, LAN, WAN and VPN address rows, and a way to keep your Mac awake while a job runs.

Paid · Mac App Store release to follow

Needs Mac · macOS 27+

Join the beta on TestFlight ↗ See the app →
Before you download

Will the iPhone and iPad apps 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.

DashTales

iPhone 15 Pro or newer · iOS 18+ · in development

Pick your device above to check.

Pick the family — Plus, mini, Pro and Pro Max all take the same iOS as the base model, so they share a line here. The iPhone 15 is the exception: only the Pro models have the memory to run AI on the phone itself, so they are listed apart. 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 six are local-first: no accounts, no ads, no analytics, no third-party SDKs. What happens on your device stays on your device.