LensSentry
vs Glasses Radar.
We'll say the awkward part first: of all our competitors, Glasses Radar is the one we respect most. It's free, it runs on-device with no account, and its own site states plainly that iOS limits scanning to the foreground and that detection is not proof of recording. That's the honesty this category mostly lacks.
So this page can't be "ours is honest, theirs isn't." It's about what $2.99 buys you beyond a straight answer — and one place where the free option genuinely has us beat.
Where they agree.
Both listen for the Bluetooth signals camera glasses broadcast and match them against a database of known hardware fingerprints. Both run entirely on your device — no account, no cloud, no tracking. Both live under the same iOS foreground rule, and both say so instead of hiding it. And both will tell you that a detection means a matching signal is nearby, not that anyone is recording.
Where they part.
| Price | Glasses Radar is free on iPhone and Android. LensSentry is $2.99 one-time on iPhone. If free-and-honest is your bar, they meet it — this page owes you that sentence. |
| Android | Theirs. Glasses Radar runs on Android, where the OS permits background scanning iOS doesn't, and adds a Wi-Fi layer that can hear Ray-Ban Metas actively streaming or offloading footage. We don't have an Android app yet; on that platform, use theirs. |
| After a detection | LensSentry keeps a session log — first seen, last seen, peak signal — that survives after you stop scanning and exports when you need to show a manager, a host, or the police what your phone heard and when. This is the single biggest thing the $2.99 buys. |
| Your own glasses | LensSentry lets you mute familiar devices, so your own pair stays visible without holding the room on permanent alert. |
| Signature updates | LensSentry's fingerprints update over the air, verified against the Bluetooth SIG registry and real-world captures — new frames are covered without waiting for an app release. |
| Beyond the phone | LensSentry has a free Mac menu-bar build for places that sit still — a front desk, a studio — where macOS allows the continuous listening no phone can. |
| Engineering receipts | Our engine is covered by 145 automated tests and the iPhone app has been confirmed against real smart glasses in the field. We publish that because it's checkable — and we'd genuinely encourage asking every detector, free or paid, how it was validated. |
Which one?
Choose Glasses Radar if
You're on Android — full stop, it's the better fit there today. Or you're on iPhone, you want a free second opinion, and you don't need a log that survives the moment.
Choose LensSentry if
You want the detection to leave a record: an exportable session log, muting for your own hardware, signatures that keep themselves current, and a Mac build for the front desk. $2.99 once, and the same honesty either way.
Two honest apps is good for everyone — including you. Whichever you pick, read how detection works so you know exactly what you're trusting.
The one that
keeps receipts.
$2.99 one-time on the App Store. No account, no tracking — and a session log that's still there when you need to show someone.