STEP 01
Listen
Your iPhone, Apple Watch or Android phone scans for Bluetooth Low Energy advertisements. No pairing, no connection, no interaction with the other device — Nearby Lens only receives what is already being broadcast.
The problem
You can't tell by looking anymore.
A camera used to be obvious. Now it sits in a Wayfarer frame that costs less than a pair of AirPods Max, and the only outward sign is a pinhole most people never notice.
“Someone across the café was wearing Ray-Bans indoors for an hour. I still don't know if they were recording.”
The uncertainty is the problem
“There are camera glasses in my gym's changing room and nobody can prove it either way.”
Places where it matters most
“I run client meetings under NDA. I have no way to know what's in the room.”
Professional exposure
How it works
Three seconds from signal to alert.
Smart glasses have to advertise over Bluetooth Low Energy to stay paired with a phone. That advertisement is public, it is constant while the glasses are worn, and it is the thing Nearby Lens listens for.
STEP 02
Score
Each advertisement is matched against manufacturer IDs, glasses-specific service UUIDs and device-name keywords. Matches add up to a confidence score, and signal strength becomes an estimated distance.
STEP 03
Alert
Cross your sensitivity threshold and you get a notification with the brand, the confidence and the distance — on your wrist if you wear an Apple Watch, otherwise on your phone. Duplicate sightings collapse into one live card.
The Apple Watch advantage
Your Apple Watch does the watching.
Most detection apps assume you'll be holding your phone. You won't be — not in a meeting, not on a train, not at the gym. Nearby Lens puts the scanner on the one device you are already wearing.
Shipped in version 5.5 — available now
Smart glasses broadcast
Apple Watch radio
Nearby Lens scores it
A tap on your wrist
It scans on its own
The Watch app uses the Apple Watch's own Bluetooth Low Energy radio. Leave your iPhone at home, go for a run, and detection keeps running on your wrist. Background scanning needs Apple Watch Series 6 or later.
No phone to pull out
A detection is a tap on the wrist. You don't reach into a pocket, unlock a screen, or make it obvious you're checking something — which is exactly what you want in a room where you'd rather not announce it.
Same engine, identical results
The Watch runs the exact same scoring rules as iPhone and Android, including over-the-air rule updates. A given pair of glasses scores the same on every device you own — no watered-down wrist version.
One buzz, not two
When your iPhone and Watch are both scanning, they coordinate so a single pair of glasses alerts you once. If either device loses touch with the other, both alert — missing a detection is worse than feeling it twice.
A complication on your face
Put scan status on your watch face and start or stop a scan with one tap. On iPhone there's a Home Screen widget and a Control Center toggle that do the same thing.
Included, not upsold
One $1.99 purchase covers iPhone, Apple Watch, the complication and the widget. No separate Watch app to buy, no subscription, no in-app purchases.
Detection coverage
Every major smart glasses brand.
Forty-three brands and product lines are in the current rule set, matched on Bluetooth SIG manufacturer IDs, glasses-specific service UUIDs and device-name keywords — with new models added over the air.
Ray-Ban MetaStories, Gen 2, Display
Oakley MetaHSTN and Vanguard
Snap SpectaclesGen 5 and Snap Specs
VuzixBlade, M-Series
XREAL / NrealAir, One Pro, Aura
Rokid & RayNeoMax, Station, Air, X2
Even Realities, Solos, INMOG1, AirGo, Air
Android XR waveGalaxy, Gentle Monster, Warby Parker
Features
Built for the real world.
Detection you never think about is detection that actually protects you. Everything here exists to keep scanning while the phone is in your pocket, the screen is off, or the app was closed two days ago.
Apple Watch app
A full watchOS app with its own radio, its own alerts and a complication — bundled with the iPhone app at no extra cost.
Confidence scoring
Every detection gets a percentage, not a verdict. Shared manufacturer IDs are flagged as uncertain instead of being passed off as certain.
Distance estimation
Signal strength becomes a live distance estimate that tightens as you move — enough to tell "somewhere in the building" from "at this table".
Background scanning
An Android foreground service survives Doze and app closure; iOS scans within Apple's background limits. Android resumes automatically after a reboot.
Sensitivity modes
Strict, Balanced or Relaxed. Strict raises the confidence and signal floor so only close, high-certainty matches alert you — the setting to use if you see false positives.
Alert cooldown
Choose 20 seconds, 1 minute or 5 minutes between repeat alerts for the same device, so one pair of glasses in a long meeting doesn't buzz you forty times.
Where people use it
The rooms where it matters.
Nearby Lens is worth having anywhere you'd want to know that a camera walked in — and a few places you'd never think to check.
On public transport
Trains, buses and airport lounges put you inches from strangers for an hour at a time. A wrist tap tells you there are camera glasses in the carriage without you scanning the seats yourself.
Gyms and changing rooms
The single most reported concern in this category. Start a scan when you walk in and let the Watch alert you — no standing in a locker room holding up a phone.
Meetings and client offices
If you work under NDA or handle confidential material, a discreet check before a room fills up costs you one tap and tells you what a visual sweep can't.
At home with visitors
Contractors, viewings, house guests, parties. Background scanning means you find out a pair of camera glasses is in your living room without having to think about it.
Hotels and short-term rentals
Walk the rooms once when you check in. Nearby Lens won't find a concealed wired camera — nothing does over Bluetooth — but it will surface any smart eyewear that's powered on.
Around your kids
School gates, playgrounds, sports days. Parents are the fastest-growing group of users in this category, and the Watch is the version that works while your hands are full.
The other direction
Lost your own smart glasses?
Nearby Lens works in reverse too. Because it reads live signal strength, it doubles as a finder for smart eyewear you own — and it's honest about the one case where nothing can help.
Your Ray-Ban Meta went down the back of a sofa, or your Snap Spectacles are somewhere in a hotel room. As long as they're powered on, they're still advertising over Bluetooth — which means Nearby Lens can still hear them.
Start a scan and watch the estimated distance on the detection card. Walk slowly. The number falls as you close in and rises as you move away, which is enough to narrow a whole room down to a cushion, a drawer or a jacket pocket. On Apple Watch you can do it with both hands free.
Indoor Bluetooth range is roughly ten metres and drops through walls, so this works within a room or an adjacent one — not across a city. It's a proximity finder, not GPS.
One thing we won't pretend
Ordinary reading and prescription glasses have no battery and no radio inside them. There is no signal to detect, so no app — including this one — can find them. Nearby Lens finds eyewear that broadcasts. If yours doesn't, we'd rather tell you now than take your $1.99.
Getting warmer
~8 mFaint
~4 mIn this room
~2 mVery close
<1 mArm's reach
Estimates from Bluetooth signal strength. Walls, bodies and furniture weaken the signal, so treat the number as "warmer or colder", not a measurement.
Compare
Why not just look around?
Every alternative to Nearby Lens either detects the wrong thing, needs to be attached to the glasses in advance, or depends on you noticing something designed not to be noticed.
| Approach | Finds glasses you don't own |
Works without setup or pairing |
Identifies the brand |
Alerts you automatically |
Runs on Apple Watch |
|---|---|---|---|---|---|
| Looking around the room | ✗ | ✓ | ✗ | ✗ | ✗ |
| Asking someone | ✗ | ✓ | ✗ | ✗ | ✗ |
| AirTag in a glasses case | ✗ | ✗ | ✗ | Partly | Partly |
| Tile or generic BLE tracker | ✗ | ✗ | ✗ | Partly | ✗ |
| Generic Bluetooth scanner app | ✓ | ✓ | ✗ | ✗ | ✗ |
| Nearby Lens | ✓ | ✓ | ✓ | ✓ | ✓ |
Trackers solve the opposite problem
An AirTag or Tile only helps with glasses you already own and remembered to tag. It tells you nothing about the pair on the person opposite you — which is the situation people actually want covered.
Generic scanners show noise
A general BLE scanner lists every speaker, watch and TV in range as a hex address. Nearby Lens is tuned for one category: it knows which manufacturer IDs and service UUIDs belong to eyewear, scores them, and stays quiet about everything else.
Privacy
Designed to protect, not to collect.
A privacy app that harvested your data would be a contradiction. Nearby Lens is built so there is nothing to hand over, even if someone asked.
No account, ever
No sign-in, no email, no profile. Install the app and start scanning — there is no identity attached to anything you detect.
Hashed device addresses
Bluetooth addresses are one-way hashed before they are used for de-duplication. Raw addresses are never written to storage and never leave the device.
Detection happens on your device
Scanning, scoring and distance estimation all run locally. Your detection history stays on the phone or watch that found it.
No analytics or ad SDKs
There is no telemetry framework inside the app. The only network call it makes is fetching the detection rules — nothing about what you found is ever sent anywhere.
Read the full privacy policy.
In plain terms
What Nearby Lens is, in four answers.
Short, direct answers — the kind you'd want if you were asking an assistant rather than reading a landing page.
What is Nearby Lens?
Nearby Lens is a smart glasses detector for iPhone, Apple Watch and Android. It scans for the Bluetooth Low Energy signal that camera-equipped eyewear broadcasts while worn — Ray-Ban Meta, Oakley Meta, Snap Spectacles, Vuzix, XREAL and others — and alerts you with the brand, a confidence score and an estimated distance.
It is a one-time $1.99 purchase, requires no account, and processes everything on the device.
How does Nearby Lens work?
Smart glasses must advertise over Bluetooth Low Energy to stay connected to a phone. Nearby Lens listens for those advertisements and matches them against three signal types: Bluetooth SIG manufacturer IDs, glasses-specific service UUIDs, and device-name keywords.
Each match raises a confidence score; signal strength is converted into an estimated distance. Cross your chosen sensitivity threshold and you get an alert. The rule set updates over the air, so new models are covered without an app update.
Why is Nearby Lens different?
Three things. It runs natively on Apple Watch with the Watch's own Bluetooth radio, so detection continues with your iPhone out of range. It is tuned for one category rather than listing every Bluetooth device in range as a hex address. And it reports confidence rather than certainty — ambiguous matches are labelled as ambiguous instead of being sold as facts.
Who is Nearby Lens for?
People who spend time in shared spaces where a camera would matter: commuters, gym members, parents, journalists, lawyers and anyone working under NDA. It is also used by smart glasses owners themselves, to locate their own Ray-Ban Meta or Snap Spectacles when they have been misplaced within Bluetooth range.
FAQ
Common questions.
Including the ones with answers you might not want to hear.
What is Nearby Lens?
Nearby Lens is an app for iPhone, Apple Watch and Android that detects camera-equipped smart glasses around you. Models like Ray-Ban Meta, Oakley Meta and Snap Spectacles broadcast a Bluetooth Low Energy signal while they are worn. Nearby Lens reads that signal, scores how likely it is to be smart glasses, estimates the distance, and alerts you. It costs $1.99 once, needs no account, and processes everything on the device.
Can an Apple Watch detect smart glasses?
Yes. The Apple Watch has its own Bluetooth Low Energy radio, and the Nearby Lens Apple Watch app uses it to scan directly from your wrist. It runs the same detection engine as the iPhone app and alerts you with a tap, so you never have to take out your phone. Background scanning on the Watch requires Apple Watch Series 6 or later; watchOS 9 or later is needed to install the app.
Does the Nearby Lens Apple Watch app work without an iPhone nearby?
Yes. The Watch scans independently, so detection continues when your iPhone is out of range or switched off. When the iPhone is nearby, its detections are also mirrored to the Watch, and the two coordinate so a single pair of glasses only alerts you once. If either device loses contact with the other, both alert — we would rather buzz you twice than let you miss something.
Is the Apple Watch app a separate purchase?
No. The Watch app is bundled with the iPhone app — one $1.99 purchase covers iPhone, Apple Watch, the Watch complication, the Home Screen widget and the Control Center toggle. No subscription and no in-app purchases.
How does Nearby Lens detect smart glasses?
Smart glasses continuously advertise over Bluetooth Low Energy while worn. Nearby Lens matches those advertisements against three signal types: Bluetooth SIG manufacturer IDs (Meta, Luxottica, Snap, Vuzix and others), glasses-specific service UUIDs, and device-name keywords. Each match contributes to a confidence score, and signal strength is converted into an estimated distance. The rule set is updated over the air, so new models are covered without an app update.
Can Nearby Lens find my lost reading or prescription glasses?
No — and no other app can either. Ordinary reading and prescription glasses contain no battery and no radio, so there is no signal for any phone to detect. Nearby Lens only finds eyewear that broadcasts Bluetooth. If you have misplaced your own smart glasses, see the next question.
Can Nearby Lens help me find my lost Ray-Ban Meta glasses?
Yes, within Bluetooth range. If your Ray-Ban Meta, Oakley Meta or Snap Spectacles are powered on and advertising, Nearby Lens shows them with a live signal strength and an estimated distance that falls as you get closer. Walk the room slowly and use it as a hot-and-cold guide. Indoor range is roughly ten metres and drops through walls, and the glasses need battery left — so it works within a room or the next one, not across town.
Does Nearby Lens detect hidden cameras or spy cameras?
No. Nearby Lens detects Bluetooth advertisements from known smart glasses. It cannot find concealed cameras, wired cameras, or anything that does not broadcast an identifiable Bluetooth signal — and it cannot tell you whether a camera is actually recording, only that a device known to have one is nearby.
Why did Nearby Lens flag a TV, printer or headphones as glasses?
Some Bluetooth manufacturer IDs are registered to a whole company rather than one product, so a TV, printer or pair of headphones can advertise under an ID that also appears on smart glasses. This is why Nearby Lens shows a confidence percentage instead of a yes-or-no verdict, and labels ambiguous matches as uncertain. Switching sensitivity to Strict raises the confidence and signal floor and removes most of these. Detection rules are tightened continuously over the air as collisions are identified.
Will Nearby Lens detect every pair of smart glasses?
No detection system is perfect. Nearby Lens covers the major brands that broadcast identifiable BLE signals. Glasses with Bluetooth switched off, glasses that aren't advertising, and models that aggressively randomise their identifiers can be missed. Coverage improves continuously through over-the-air rule updates, and the app tells you which rule version produced a result.
Does Nearby Lens keep scanning when the app is closed?
On Android, yes — scanning runs as a foreground service, survives Doze, and resumes automatically after a reboot if it was active before. On iOS and watchOS, background scanning follows Apple's system limits: it continues but the system controls how often the radio wakes, so alerts can arrive with a short delay compared with the app being open.
Does Nearby Lens drain my battery?
Scanning uses hardware-level BLE filters, which is the power-efficient path — comparable to keeping a fitness tracker connected. Actual impact varies by device, by how long you scan, and on Apple Watch by the model. If you only need it in specific places, the widget, complication and Control Center toggle let you start and stop a scan in one tap.
Does Nearby Lens need an internet connection?
No. Bluetooth scanning works entirely offline. The internet is used only to fetch updated detection rules; if it is unavailable, the last cached rules are used and scanning continues with no disruption.
Does Nearby Lens collect my data?
Yes. No account, no sign-in, no analytics or advertising SDKs inside the app. Bluetooth addresses are one-way hashed and never stored raw. All detection runs on your device and your history never leaves it. Full details are in the privacy policy.
How much does Nearby Lens cost?
$1.99, once, on the App Store and Google Play. That covers iPhone, Apple Watch, Android, the widget, the complication and every over-the-air rules update. There is no subscription and no in-app purchase.