A joke 'slap detector' is easy to fake with the microphone or a fixed trigger. Apple also gives no clean public Core Motion API for the MacBook accelerometer.
active v0.3.5
SlamX
Slap your MacBook and it knows — real accelerometer, no microphone.
A native macOS toy that reads the MacBook's built-in Apple SPU accelerometer over IOKit HID, spots a sharp impact spike, counts it, and plays a sound. No mic, no fake triggers — it reacts to the actual motion sensor, with live telemetry and a calibration wizard so you can see it working.
A SwiftUI app that taps the private AppleSPUHIDDevice stream through IOKit HID, with live telemetry (impact, peak, sample rate, raw bytes), Soft/Balanced/Hard presets, a calibration wizard, and local sound feedback.
A genuinely fun toy that's also proof it reads real device telemetry — sensor-only, with no microphone access and nothing uploaded.
For Mac people who enjoy a weird native experiment wired to real hardware.
Developer setup
source without GitHub CLI
git clone https://github.com/jx-grxf/SlamX.git && cd SlamX source with GitHub CLI
gh repo clone jx-grxf/SlamX && cd SlamX latest release
open https://github.com/jx-grxf/SlamX/releases/tag/v0.3.5 download stable macos with GitHub CLI
gh release download v0.3.5 -R jx-grxf/SlamX -p 'SlamX-0.3.5.dmg' download stable archive with GitHub CLI
gh release download v0.3.5 -R jx-grxf/SlamX -p 'SlamX-0.3.5-source.tar.gz' download stable archive with GitHub CLI
gh release download v0.3.5 -R jx-grxf/SlamX -p 'SlamX-0.3.5-source.zip' Highlights
- Reads the MacBook's Apple SPU accelerometer directly over IOKit HID.
- Live telemetry: impact, peak, sample rate, axes, magnitude, and raw HID bytes.
- Sensor-only by design — no microphone access, no audio fallback, nothing uploaded.
- Calibration wizard, threshold presets, and your own sounds. Built for fun; please don't actually abuse your Mac.
