Noise Spectrum Logger vs Detector.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Noise Spectrum Logger
Visualize sound frequencies in real-time with a dynamic spectrum display. Log and export audio data for analysis, with options for smoothing and background processing. Access all features offline.
- Real-time spectrum display (20-20000Hz)
- Zoomable spectrum view
- Maximum value highlighting
- Spectrum smoothing options (Mean/RMS)
- Logging and CSV export
- Background processing
- Offline functionality
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1. DESPLAY The power spectrum of sound is displayed in the range of 20 - 20000Hz. You can zoom in/out the spectrum by pinching in/out smoothly. Also landscape orientation is supported. 2. USEFUL While "hold" switch is ON, the maximum values are displayed in red color. You can select "Mean" or "RMS" as the way of smoothing the spectrum out. 3. LOGGING By sliding "log" switch, the logging mode is started. To choose a past log from "History" tab, you can pull it from iPhone via email as a CSV file. The CSV file can be edited with Excel etc. 4. AVAILABLE Without cellular data service, the full functions are available. 5. BACKGROUND PROCESSING You can use the logging function even when iPhone in your pocket. 6. TECHNICAL NOTE Sample rate: 44.1kHz Bit depth: 32bit float FFT window function: Blackman FFT samples: 8192
Detector.
This app uses your phone's sensors to scan for hidden signals, wireless activity, and environmental anomalies. It helps inspect spaces for suspicious devices and provides detailed reports for privacy and security analysis. Features include room mapping, risk assessment, and device diagnostics.
- Hidden signal scanning
- Device analysis
- Room mapping
- Risk assessment
- Detailed reporting
- Environmental anomaly detection
- Offline mode
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Detector – Hidden Signal Scanner & Device Analyzer See what your eyes cannot — using your phone. Detector is a privacy, security, and environmental analysis app that helps inspect hotel rooms, vacation rentals, offices, vehicles, and other spaces for unusual signals, wireless activity, suspicious devices, and environmental anomalies. Using your devices built-in sensors and wireless capabilities, Detector combines scanning tools, room mapping, risk analysis, reporting, and device diagnostics in one app. Full Scan Perform a comprehensive room inspection and create a detailed investigation report. Features include: • Room Mapping & Coverage Tracking • Spatial Findings & Risk Markers • Timeline-Based Event Tracking • Risk Summary Reports • Historical Scan Archive • Sensor-Specific Findings • Suspicious Activity Logging • Photo Evidence Capture • Notes & Investigation Records • PDF Export & Sharing Detection Tools Detector combines multiple technologies into a single workflow: • Infrared / Lens Detection • Ultrasound Analysis • Magnetic Field Detection • Light & Flicker Monitoring • Motion Detection • Pressure Monitoring • Bluetooth (BLE) Scanner • Wi-Fi Scanner • Ultra Wideband (UWB) Analysis • NFC Tag & Device Detection • Cellular Network Analysis • GPS Anomaly Monitoring Reports & Investigation Tools Review current and historical findings with detailed reporting features. • Session Reports • Historical Reports • Timeline View • Risk Classification • Detailed Finding Records • Full Scan Reports • Print, Copy & PDF Export Track scans over time and compare findings across multiple locations and sessions. Device Utilities • Battery Report • Device Health History • Performance Report • Internet Speed Test • Storage Cleaner Privacy-Focused Design • Privacy-First Approach • Local Scan History • Offline Mode Available • No Account Required • Minimal Data Collection Ideal For • Travelers • Hotel Guests • Vacation Rental Users • Journalists • Investigators • Security Professionals • Privacy-Conscious Individuals • Anyone Curious About Hidden Signals and Wireless Activity Additional Features • Support for 77+ Languages • Historical Scan Storage • Photo Documentation • Risk-Based Detection System • Room Coverage Tracking • PDF Export & Sharing • Offline Mode (Subscription) • Ad-Free Experience (Subscription) Detector helps you understand the signals, devices, and environmental activity around you, providing tools for inspection, analysis, documentation, and awareness. Note: Detector uses available device sensors and wireless technologies to analyze environmental conditions, identify compatible nearby devices and tags, and highlight unusual activity patterns. Results should be used as indicators and informational guidance rather than definitive proof of surveillance devices or security threats. LICENSED APPLICATION END USER LICENSE AGREEMENT: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Noise Spectrum Logger at none against Detector.'s shown. Noise Spectrum Logger also leads on monetization model (free vs free with in-app purchases). Detector.'s advantage is update cadence (weekly vs every 10 months). On price, in-app purchases, 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
Both are free to download. Noise Spectrum Logger sells 1 one-off in-app purchase and Detector. sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Noise Spectrum Logger ships an update every 10 months, Detector. weekly. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.
| Parameter | Noise Spectrum Logger | Detector. |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 10 months | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 176 MB |
| Age rating | 12+ | 4+ |
| Developer | Yukiko Iwai | Olga Ivanova |
Customer experience
Noise Spectrum Logger
Detector.
In-app purchases
Noise Spectrum Logger
- Remove Ads$3.99
Detector.
- detector_by_oliva_subscription$1.991 Month
- detector_by_oliva_donation$1.99
Questions
Is Noise Spectrum Logger free?
Is Detector. free?
Do Noise Spectrum Logger or Detector. have ads?
Which is updated more often, Noise Spectrum Logger or Detector.?
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