What’s the best way to detect if you’re being tracked or followed?
The short answer
There is no magic box, but modern tracking gear is noisy on the radio, so the practical move is to passively listen for it. You have roughly six options, in rising order of capability: (1) your phone plus a free tracker app (AirGuard / Apple Tracker Detect); (2) a cheap RF “bug detector” wand; (3) a Flipper Zero (versatile, but it transmits and isn’t purpose-built for this); (4) an RTL-SDR + laptop (powerful, steep, not pocketable); (5) a DIY Wi-Fi/BLE dev board; and (6) a purpose-built passive scanner such as the MaxIntel Scout, which identifies what a signal is by matching the hardware maker against a 289-entry surveillance OUI list plus Wi-Fi/BLE signatures (including Flock ALPR).
The honest ceiling: every passive hit is a lead, not proof, and anything that is wired, analog or switched off won’t show up at all. Golden rule: detect, don’t attack — receiving public broadcasts is passive and legal; jamming, deauthing or breaking in is not.
How do the options compare?
Each row is rated for the one job that matters here: passively telling you something near you may be watching or tracking you. “Identifies the device?” means it tells you what the signal is (maker/type), not just that a signal exists.
| Option | Passive? | Detects | Identifies the device? | Pocketable | Learning curve | Best for |
|---|---|---|---|---|---|---|
| Phone + free apps | Yes | BLE trackers, Wi-Fi names | Partial | Yes | None | Everyone, as a first check |
| RF “bug detector” wand | Yes | Broadband RF energy | No | Yes | Low | Crude room sweeps |
| Flipper Zero | Partial (can transmit) | Sub-GHz, NFC/RFID, BLE | Partial | Yes | Medium | General RF tinkering |
| RTL-SDR + laptop | Yes | Wide RF spectrum | Partial (manual) | No | High | Hobbyists & researchers |
| DIY Wi-Fi/BLE board | Yes | Wi-Fi/BLE (your code) | Partial | Yes | High (you build it) | Makers who want to roll their own |
| MaxIntel Scout | Yes (never transmits) | Wi-Fi/BLE makers, ALPR, drones, trackers, ultrasonic beacons | Yes (289-OUI list + signatures) | Yes | Low (turnkey, touchscreen) | Purpose-built passive detection |
A row scoring well here isn’t an endorsement for every job — it’s the fit for passive surveillance detection specifically. All of these are legitimate tools in their own lanes.
Can your phone detect surveillance devices?
Yes — partly, and it’s the right place to start because it’s free and already in your pocket. A free Bluetooth-tracker app (AirGuard on Android, Apple’s Tracker Detect) catches the most common personal threat: an AirTag or similar tag moving with you. Wi-Fi analyzer apps list nearby networks.
- Free, always on you, no setup.
- Good coverage of the #1 stalking tool (BLE tags).
- Phone OSes block low-level radio: no Wi-Fi monitor mode, no sub-GHz, no ultrasonic.
- Won’t tell you a camera’s maker or flag an ALPR — no surveillance-maker matching.
Pair it with our Bluetooth tracker detection guide.
Are cheap RF “bug detector” wands worth it?
They’re the cheapest hardware option and genuinely passive, but crude. A wand beeps on broadband RF energy — it can’t tell you whether that energy is a hidden camera, a baby monitor, or your own microwave.
- Cheap and simple; catches strong analog transmitters other tools miss.
- No identification — high false-positive rate, no idea what it found.
- Useless against anything that only talks Wi-Fi/Bluetooth in short bursts.
Can a Flipper Zero detect surveillance?
The Flipper Zero is a deservedly popular RF multitool, and it can read sub-GHz, NFC/RFID and BLE. But it is a general tool, not a purpose-built passive surveillance detector, and several of its headline features transmit. Transmitting is an active act with different legal and ethical weight than passively receiving — and for simply answering “is something watching me?” it doesn’t match a signal against a surveillance-maker list out of the box.
- Flexible, huge community, fun to learn on.
- Transmit-capable — easy to stray from passive/legal if you’re not careful.
- No built-in surveillance OUI/ALPR identification; you’d be reading raw signals.
What about an RTL-SDR and a laptop?
An RTL-SDR dongle plus software is the most powerful passive option dollar-for-dollar — you can see a huge slice of the spectrum. It’s also the least turnkey: it isn’t pocketable, the learning curve is steep, and nothing identifies a surveillance device for you.
- Widest passive spectrum coverage; superb for learning RF.
- Laptop-tethered, steep curve, manual analysis — not a walk-around detector.
What makes the MaxIntel Scout different?
MaxIntel Scout is a passive-only RF/OSINT handheld built on the Waveshare ESP32-S3-Touch-LCD-1.54, and it’s part of maxintel.org. It’s the only option here designed specifically to answer “is something near me watching or tracking me?” and to tell you what it found — it never transmits.
- Identifies devices: matches Wi-Fi/Bluetooth makers against a 289-entry surveillance OUI list plus SSID and BLE signatures, including Flock ALPR.
- “Following me?” detector flags a device that keeps moving with you; plus ultrasonic-beacon detection, an IoT scan, and a Spy mode with a law-enforcement-only filter.
- Turnkey: touchscreen handheld, no laptop. Flash it free in your browser (Web Serial) at Scout Studio — firmware v1.0.
- Runs on an inexpensive, off-the-shelf board you can buy anywhere.
- Passive means it won’t catch a device that’s silent, wired or switched off.
- Sub-GHz needs an add-on; it is not a licensed TSCM sweep.
Get the board. The MaxIntel Scout runs on the Waveshare ESP32-S3-Touch-LCD-1.54 — grab the board (affiliate link) and flash Scout free in your browser:
Full details on the MaxIntel Scout product page.
What can none of these passive scanners do?
This is the part most product pages skip. Passive scanners only hear devices that transmit. A camera that records to a local SD card and never joins Wi-Fi, a wired microphone, or a tracker that’s powered off will not appear on any of these. None of them is a licensed TSCM sweep. A passive device can detect and warn you about a nearby Bluetooth tracker, but it cannot force-ring or disable an AirTag — that’s awareness, not control. And a radio match tells you a device from a maker is nearby; it doesn’t prove it’s recording you or who owns it. Confirm by eye, and if you feel unsafe, preserve evidence and get help — see the counter-surveillance field guide.
FAQ
What is the best way to tell if you are being tracked or followed?
There’s no single magic box. Because most tracking gear transmits, the practical approach is to passively listen: Bluetooth tags with a phone app (AirGuard / Tracker Detect), and Wi-Fi/Bluetooth surveillance makers with a scanner that checks the maker against a known surveillance list. A purpose-built passive scanner such as the MaxIntel Scout combines those and flags makers from a 289-entry surveillance OUI list plus Flock ALPR signatures. Every passive hit is a lead to confirm, not proof.
Can my phone detect surveillance devices?
Partly. A free tracker app catches the most common personal threat (BLE tags), but phone operating systems block low-level radio access — no Wi-Fi monitor mode, no sub-GHz, no ultrasonic, and no surveillance-maker matching. Best free starting point, weakest ceiling.
Is a Flipper Zero a good counter-surveillance detector?
It’s a great general RF multitool but not purpose-built for passive surveillance detection, and several features transmit — an active act with different legal weight than passively receiving. For simply detecting whether something is watching you, a passive-only scanner that identifies the device maker is a closer fit.
What makes the MaxIntel Scout different from other scanners?
It’s passive-only and purpose-built: it identifies what a signal is by matching makers against a 289-entry surveillance OUI list plus SSID/BLE signatures (including Flock ALPR), has a “following me?” tracker detector, ultrasonic-beacon detection, an IoT scan and a Spy mode with a law-enforcement-only filter — and you flash it free in your browser. It runs on an inexpensive off-the-shelf board.
What can none of these passive scanners do?
They only hear devices that transmit, so a local-only camera, a wired mic or a powered-off tracker won’t show. None is a licensed TSCM sweep, and a passive device can detect but not disable an AirTag. A radio match is a lead, not proof — confirm by eye.
Is it legal to scan for surveillance devices?
Passively receiving signals that devices broadcast publicly is legal almost everywhere, and that’s all a passive scanner does. Jamming, deauthing, spoofing or breaking into a device or network is not. Scan places you have the right to — your own home, car or hotel room.