FourScan vs Sensor
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
FourScan
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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.
Sensor
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SensorStream turns your iPhone and Apple Watch into real-time motion sensor tools. Select a device, choose the sensor streams you need, and view smooth live graphs with sampling- rate information. Record sessions locally and export the captured data as CSV files for analysis, research, testing, or development. Features include: β’ iPhone and Apple Watch sensor streaming β’ Accelerometer and gyroscope data β’ Gravity and magnetic-field measurements β’ Pitch, roll, yaw, quaternions, and rotation matrices β’ Live sampling-rate display β’ Selectable sensor channels β’ Smooth, full-width graphs β’ Local recording with pause and resume controls β’ CSV file sharing and deletion β’ Light and dark appearance support Available streams depend on the selected device and its hardware capabilities. SensorStream excludes HealthKit-dependent biometric data.
Screenshots
Verdict
The clearest difference is iOS requirement: FourScan at 16.0 against Sensor's 18.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | FourScan | Sensor |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 days | β |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, Apple Watch β better |
| Requires iOS | 16.0 β better | 18.0 |
| Further details β not scored | ||
| Size | 3 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | satoshi amasaki | Yerim Lab LLC |
In-app purchases
FourScan
No in-app purchases
Sensor
No in-app purchases








