Auto lock your Mac via phone proximity (No Apple Watch)

Hi HN,

I built Blunlock to solve the "clamshell mode" problem. Since I use my MacBook with the lid closed, Touch ID is useless. I wanted a way to lock/unlock via proximity without a $300 Apple Watch or a battery-draining phone app.

How it works: It pings your phone’s native Bluetooth LE signal and measures RSSI to determine proximity. Walk away -> Mac locks. Walk back -> it wakes up.

The Tech: Built with Electron. It is currently an unsigned .dmg, so Gatekeeper will flag it (Right-click -> Open to bypass). I'm doing a free beta to test reliability before I buy the $99 Apple Cert.

You can find the site and get early access at: blunlock.com

I’d love feedback on handling BT MAC randomization or optimizing scanning!So I built Blunlock.

It relies entirely on the Mac pinging your phone's native Bluetooth LE signal.

How it works: You pair your phone via Bluetooth. The app runs in the background and measures the RSSI (signal strength) to determine proximity. Walk away, the signal drops, the Mac locks. Walk back, it wakes up.

The Tech & The Catch: I built this using Electron to get it out the door quickly. Before I drop the $99 on an Apple Developer Cert to properly sign it and handle the Mac App Store sandbox restrictions, I want to make sure the proximity logic actually holds up across different environments (M-series vs Intel, different BT interference levels). Because it's currently an unsigned .dmg, Gatekeeper will flag it.

I'm doing a closed beta right now for free to anyone willing to right-click -> "Open" and help me test the Bluetooth reliability before I do a real launch. If you want to help me break it, you can grab the beta from the website.

Would love any feedback on handling BT MAC address randomization or optimizing the background scanning!