Privacy is personal.
Perimeter helps surface potentially unwanted trackers, smart glasses, and other privacy-relevant devices — and tells you when something deserves attention.
Most of it is ordinary
Most wireless activity around you is ordinary. Perimeter looks at supported observations over time so a brief encounter and repeated activity do not have to be treated the same way. It evaluates persistence, movement context, apparent signal proximity, repeated observations, and other supported evidence before deciding what deserves closer review.
Perimeter reports evidence and context — not identity, ownership, recording status, or intent.
Honest by construction
Bluetooth and Wi-Fi observations depend on the device, the environment, operating conditions, and what is actually broadcasting at that moment.
Perimeter is designed to preserve that uncertainty instead of turning an incomplete observation into a definitive conclusion. When the evidence supports only a possibility, it says so.
Many devices advertise only at certain moments. A device that is silent, connected, or already paired may produce nothing to observe.
Walls, bodies, and radio congestion change what reaches the iPhone. Signal strength is not a calibrated distance measurement.
Devices using protocols Perimeter does not support, or modalities an iPhone cannot sense, may not appear at all.
A supported match is a candidate. Perimeter shows the evidence and where the evidence stops, rather than naming a physical product it cannot prove.
A privacy tool is more useful when it is clear about what it cannot see.
Read what Perimeter can and cannot tell you.Three things people actually need
Different questions need different evidence. Perimeter treats persistent tracker-like activity, an unfamiliar room, and a supported smart-glasses signal as three separate jobs.
01 / TRACKER-LIKE ACTIVITY
Perimeter looks beyond one nearby sighting and helps you review repeated observations over time and location. It looks for tracker-like observation patterns that persist after movement or recur across separate locations before elevating a concern.
Separate observations cannot always be shown to come from the same physical device. Perimeter says when that is unresolved rather than assuming it.
Tracker-like signal
02 / PRIVACY CHECKS
Use Perimeter’s Check flow to review supported wireless observations and work through a structured physical privacy check. One signal check monitors supported Bluetooth signatures and checks the Wi-Fi network your iPhone is using. Optional lens and photo tools and a guided physical inspection are there when they help.
Hotels · vacation rentals · offices · vehicles · other unfamiliar spaces. A completed check is a record of what you reviewed, not proof that a space is device-free.
03 / SMART-GLASSES AWARENESS
Perimeter can surface supported wireless patterns associated with some smart glasses so you can make a more informed decision about your surroundings. It presents them as a candidate, using the evidence it actually has.
A signal cannot tell Perimeter whether glasses are recording or who owns them.
Smart glasses candidate
From signals to context
Many scanner apps stop at showing nearby broadcasts and leave you to work out what they mean. Perimeter adds context across observations and explains why something is worth a second look.
Private by design
Your observations, scan history, and saved location context stay on your iPhone. No account is required. Information leaves the device only when a feature requires an external platform service or when you deliberately export or share information, as described in the Privacy Policy.
Evidence is not proof
Perimeter can evaluate only technology its available iPhone sensing can observe. It cannot detect every tracker, camera, recorder, wearable, or surveillance method. A device may be present without producing a signal your iPhone can observe. Perimeter provides awareness and context — not a guarantee that an environment is safe.
Silent devices may not be observed. Connected devices may stop emitting an observable signal. Unsupported protocols and devices outside the iPhone’s available sensing modalities may not be observed at all.
Questions, answered plainly
Clear expectations are part of the product, not fine print.
Perimeter surfaces supported wireless observations near your iPhone. That includes Bluetooth advertisements matching supported tracker or smart-glasses signal profiles, and — during a guided Place Check — camera-related service names advertised on the Wi-Fi network your iPhone is using. It does not inventory every nearby device, and a supported match is a candidate rather than a confirmed product identification.
No. Perimeter is not a universal hidden-camera detector and cannot guarantee that a hidden camera will be found. Its guided Place Check combines the sensing available on an iPhone — supported Bluetooth observations, a local-network check, and optional lens and photo tools — with a structured physical inspection you carry out yourself. A camera that is wired, offline, cellular, or otherwise not broadcasting on a supported channel may not be observed at all.
No. A wireless observation cannot tell Perimeter whether glasses are recording or who owns them. Perimeter can surface supported wireless signal patterns that may be associated with compatible smart glasses, and it presents them as a candidate rather than an identification.
Perimeter looks for tracker-like observation patterns that persist after you move or recur across separate locations before elevating a concern. A single nearby sighting is not treated as suspicious on its own. Separate observations cannot always be shown to come from the same physical device, and Perimeter reports that as unresolved instead of assuming continuity.
No. Silent devices, connected devices, unsupported protocols, and devices outside the iPhone’s available sensing modalities may not be observed. Bluetooth availability and iOS operating conditions also affect what can be seen. A quiet result is not evidence that a space is device-free.
Core signal analysis runs on your iPhone, and Perimeter does not upload scan results, nearby-device records, routes, photos, or saved checks to Perimeter-operated servers. Information leaves the device only when a feature requires an external platform service, or when you deliberately export, share, or submit it. The Privacy Policy describes each case.
Not yet. Perimeter is in pre-release testing for iPhone. Add your email below and we’ll send one message when it is available.
Patent pending. A U.S. provisional patent application was filed on August 7, 2026. A pending application does not establish issued claims, and it is not a statement about what the current app does.
App Store submission pending
The App Store link will appear here as soon as Perimeter is available.
On-device by design · Evidence without alarmism