Why your Mac and iPad cannot play Core Haptics
Core Haptics drives the Taptic Engine in iPhone. Macs and iPads do not have the hardware Core Haptics uses for playback, and the framework says so: CHHapticEngine.capabilitiesForHardware().supportsHaptics returns false on them, and on the Simulator too. Core Haptics playback requires iPhone 8 or later.
That leaves haptic designers with an awkward loop:
- Edit numbers in JSON or code on a Mac.
- Build and run on an iPhone.
- Trigger the right screen or game moment.
- Feel it, go back, change a value, repeat.
Each round trip can take a minute or more. Haptics are tuned in small steps (a sharpness of 0.4 versus 0.5 feels different), so a slow loop means fewer iterations and worse results.
The faster loop: edit on a big screen, feel on iPhone
What you want is the same loop audio designers have: change something, hear it immediately. For haptics that means a live link between the editor and an iPhone in your hand.
In Haptic Forge, my Core Haptics editor for iPhone, iPad and Mac, that works like this:
- Pair once. Pair a nearby iPhone with your Mac or iPad using a six-digit code. You only do this once.
- Edit as usual. The Mac and iPad versions give you the full editor: library in a sidebar, layer tabs and an inspector for exact values.
- Feel each change. The paired iPhone plays every pattern as you edit, so you feel the tweak a moment after you make it.
No build, no run, no navigating to the right screen.
What stays private
- The connection stays on your local network. Patterns are not uploaded anywhere to reach the phone.
- The connection is encrypted.
- There is no account to create. Your library syncs through your own iCloud across iPhone, iPad and Mac.
When you do not have a Mac at your desk
You can also design and feel patterns on iPhone alone, on the same device. Pairing is for when you want a larger canvas, a precise pointer, or to work next to your Xcode project.
Testing haptics in your own app
Once a pattern feels right in the editor, export it as a standard AHAP file and test it in context. A few practices make that stage smoother:
- Gate on capability, not on device model. Check
supportsHapticsand skip haptics quietly where it is false, so iPad and Mac builds of your app do not log errors. - Keep patterns as files. Loading AHAP from the bundle means you can replace a pattern without touching code, and designers can hand over files directly.
- Handle engine resets. Set
stoppedHandlerandresetHandleronCHHapticEngineand restart it when needed. Missing this is a common reason haptics work once, then stop after the app returns from the background. - Test with real context. A tap that feels great on its own may be too much when it fires on every scroll step. Try patterns inside the actual interaction.
- Check with sound on and off. Haptics paired with audio feel different from haptics alone.
Apple’s Core Haptics documentation covers engine lifecycle and capability checks in detail.
Mac editor vs iPhone editor
| iPhone | Mac and iPad | |
|---|---|---|
| Edit patterns | Yes | Yes, full editor with sidebar, layer tabs, inspector |
| Play haptics locally | Yes | No, the hardware does not support Core Haptics |
| Feel edits live | On the same device | On a paired iPhone |
| Import and export AHAP | Yes | Yes |
| Library sync | Your iCloud | Your iCloud |
How I built it
Haptic Forge is one SwiftUI codebase across iPhone, iPad and Mac, with layouts that fit each platform. The pairing is an encrypted local-network link: the editor sends the pattern, the phone plays it with Core Haptics. If you are new to the building blocks you will be tuning, start with transient vs continuous haptics.
