Rex provides anti-theft protection for MacBooks through an automatic alarm system that sounds when the laptop is moved unexpectedly. The app addresses security concerns for users working in public spaces like coffee shops, co-working spaces, airports, and libraries.
The core mechanism triggers a loud alarm through the Mac’s speakers if someone attempts to pick up the laptop. The alarm plays even with headphones plugged in, bypassing the obvious workaround that would render most alarm apps ineffective. Connected wireless headphones also receive the alarm simultaneously.
A distinguishing feature is the always-armed approach. Unlike alarm apps requiring manual activation, Rex arms automatically based on learned patterns, removing the need to remember to enable protection before stepping away. This automatic behavior integrates into workflows without adding another task to remember.
Notification options include push notifications to iPhone or Android devices, plus Telegram integration. A motion detection feature for monitoring unexpected MacBook movement is planned for a future update.
Privacy implementation avoids cloud accounts, analytics SDKs, and ad tracking. No data leaves the Mac except for user-enabled notifications and optional webhook configurations.
Available on the Mac App Store for $4.99 (one-time). Developed by Sixcolors Apps.
Requirements and system impact are typical for menu bar utilities, with stable operation reported across testing periods.
Limitations include the specialized use case: users working primarily from home or secure offices gain minimal benefit. The app also cannot prevent theft, only deter it and alert the owner.
Alternatives include Find My Mac (Apple’s built-in tracking), Prey (cross-platform anti-theft), and manual vigilance with laptop locks.
Suitable for users who regularly work in public spaces where laptop theft is a genuine concern and want automatic protection without remembering to arm a security app.
