Mac App Snaps Photo of Anyone Using Your Machine While You’re Away

UpTrajectory Review

A developer shipped a macOS menu-bar app called Someone Was Here that photographs whoever sits down at your Mac while you are away. The app uses Apple Vision and Core ML to compare the face at your keyboard against yours; a mismatch triggers the camera and sends the photo to your iPhone through a companion app, Pushover, ntfy, Telegram, or a webhook. The whole pipeline runs locally, with no tracking and no ads. Remote alerts carry a one-time $4.99 lifetime purchase. The author credits an ex-partner for the inspiration, which tells you exactly the threat model this serves: someone who already knows your password.

For a small-business owner, this addresses a real gap. Shared back-office machines, front-desk Macs, and laptops left open in a shop or studio are all exposed to casual snooping by employees, contractors, or walk-ins. Standard device-management tools lock the screen and log access, but they rarely show you who actually sat there. Someone Was Here closes that loop with a photograph and a push alert, and it does so without routing biometric data through a third-party cloud. That local-processing choice matters for anyone handling client records or payroll on the same machine.

The Hacker News thread predictably splits between "useful security tool" and "creepy surveillance toy." Both readings hold. The same feature that catches a snooping ex or a dishonest employee also photographs anyone who touches the machine, and face recognition at consumer accuracy rates produces false positives and false negatives. We are skeptical of the marketing framing that this protects you whether the machine was left unlocked or the intruder knows your password; a determined actor can disable or uninstall any menu-bar app. Treat this as a tripwire and a deterrent, not a vault.

The second-order effects cut in two directions. Employers who deploy this on staff machines without a clear policy risk violating wiretap and consent laws in many jurisdictions, and a photographed face is biometric data that may fall under state privacy statutes. On the other side, a small shop that loses a laptop now gains evidence for a police report and a timestamped record for an insurance claim. The $4.99 one-time price also undercuts the subscription-heavy security market, which may pressure rivals to drop recurring fees for simple alerting tools.

Watch how Apple responds. The app leans on camera and face-recognition APIs that Cupertino has tightened in recent macOS releases, and a future permission prompt could break the silent-photo model overnight. If you try it, test the alert path before you rely on it, post a notice if the Mac is shared, and pair it with FileVault and a short auto-lock timer so the photograph is a bonus, not your only line of defense.

“Many thanks to my ex for inspiring my new MacOS app, Someone Was Here.” — Hacker News (front page)

Takeaway: Test the alert path, post a notice on shared machines, and pair the app with FileVault and a short auto-lock timer.