Comparison

FourScan vs Sonar

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FourScan

Features
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Protect your privacy with 4 scanning technologies. Worried about hidden cameras or listening devices in hotels, Airbnbs, or rental spaces? FourScan runs 4 detection scans sequentially with a single tap. [4 Detection Powers] 1. Magnetic Scan - Detects magnetic field anomalies from electronic devices 2. Infrared Scan - Uses front camera to detect IR LEDs from night vision cameras 3. Wi-Fi Scan - Discovers suspicious devices on the local network 4. Bluetooth Scan - Searches and analyzes nearby BLE devices Note: Basic checking tool, not a substitute for professional investigation.

About

Sonar

Features
Read full description

SONAR: HIDDEN CAMERA AND TRACKER DETECTOR Sonar helps you check for hidden cameras, hidden microphones, and Bluetooth/Wi-Fi trackers, a privacy inspection support tool with infrared, Wi-Fi network, and Bluetooth scanning. Whether you're in a motel room, hotel, Airbnb, locker room, public restroom, fitting room, car, or your own luggage, Sonar helps you inspect the space in minutes. IMPORTANT: no phone app can guarantee with certainty that a space is free of hidden cameras. Sonar is a support tool, each finding comes with a confidence level so you can physically check the spot it flags. Always use it alongside a manual inspection. DETECTOR FEATURES Infrared scanner Point your phone's camera and look for the telltale reflection of hidden spy camera lenses, a common sign in cameras disguised as a button camera, pen camera, charger, smoke detector, or clock. Works best in a dark room and doesn't replace a physical check. Wi-Fi network and Bluetooth device detection Sonar scans the local Wi-Fi network and nearby Bluetooth devices to flag devices with characteristics of connected cameras or trackers. Each result shows a confidence level, not a definitive confirmation. Bluetooth tracker detector Flags signals from Bluetooth trackers nearby: in your car, bag, luggage, or personal belongings, as support against unwanted tracking during travel and everyday life. Guided sweep A practical checklist walks you through spots where cameras and microphones are commonly hidden: outlets, smoke detectors, picture frames, mirrors, chargers, clocks, and more, so you can physically inspect each one. Clear, straightforward results See the confidence level of each finding, with real-time visual indication, no technical jargon. WHY USE SONAR Works offline Simple interface anyone can use Fast: full sweep in just a few minutes No complicated sign-up GREAT FOR - Motel, hotel, and Airbnb stays - Short-term rentals and vacation homes - Locker rooms, gyms, and public restrooms - Store fitting rooms - Checking your car and luggage for trackers - Confidential meetings and work spaces YOUR PRIVACY COMES FIRST Hidden cameras and trackers are more common than you'd think. Sonar exists to give you a support tool for checking your space, simple and accessible, always as a complement to your own inspection, never as an absolute guarantee. WHERE YOU CAN USE SONAR Hotel room · Motel room · Airbnb · Vacation rental · Bed and breakfast · Hostel · Resort · Spa · Sauna · Public restroom · Gym locker room · Pool locker room · Club locker room · Store fitting room · Lingerie fitting room · Event or theater dressing room · Meeting room · Shared office · Coworking space · Rental car · Uber or taxi · Rented beach house · Vacation cabin · Guest room at someone else's home · Doctor's office or clinic · Short-term rental property THE GUIDED CHECKLIST COVERS COMMON SPOTS LIKE Smoke detector · Wall clock · Desk clock · Alarm clock · Phone charger · USB wall adapter · Power strip · Wi-Fi router · Bluetooth speaker · Wall art · Picture frame · Mirror · Desk lamp · TV remote control · Teddy bear · Glasses · Pen · Keychain · Fake potted plant · Book on a shelf Download Sonar now and run your first sweep in under 2 minutes. ---------------------------- Terms of Use (EULA): https://sonarcameradetector.com/terms

Screenshots

FourScan3 screens
Sonar4 screens

Verdict

The call

The clearest difference is in-app purchases: FourScan at none against Sonar's 3. FourScan also leads on update cadence (every 10 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sonar sells 3 in-app purchases, starting at $4.99 per 7 days. FourScan asks for nothing beyond the download.

UpkeepUpdate frequency

FourScan ships an update every 10 days, Sonar every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 4 level
FourScan versus Sonar: the parameters behind the verdict, then further details
ParameterFourScanSonar
PriceFreeFree
Update frequencyEvery 10 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhoneiPhone
Requires iOS16.0 — better16.4
Further details — not scored
Size3 MB55 MB
Age rating4+4+
Developersatoshi amasakiCaue Mattos Silvestre

In-app purchases

None

FourScan

No in-app purchases

3 purchases

Sonar

Subscriptions3
  • Weekly$4.997 Days
  • Monthly Subscription$8.991 Month
  • Annual Subscription3 Days trial$29.991 Year

Questions

Is FourScan free?
FourScan is free to download, with no in-app purchases.
Is Sonar free?
Sonar is free to download, with in-app purchases available.
Do FourScan or Sonar have ads?
Neither FourScan nor Sonar shows ads.
Which is updated more often, FourScan or Sonar?
FourScan ships an update every 10 days, and Sonar every 3 weeks. Most recently, FourScan was updated on October 25, 2026 and Sonar on October 24, 2026.

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