Comparison

Noise Diary vs Hidden Camera Detector

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

Head to head
About

Noise Diary

Features
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An application for recording audio with real-time noise level monitoring and calendar-based organisation. Created for anyone with noise nuisance issues who needs to keep a noise diary. Features: - Audio Recording with Format Selection: Choose between AAC, WAV, and M4A audio formats. Real-time audio recording is handled with microphone permission, and high-quality audio capture is achieved at a 44.1kHz sample rate. (Note: MP3 is not supported; AAC provides better quality at the same file size.) - Noise Level Meter: Visualise real-time audio amplitude with a noise meter displaying a decibel-like scale (0-120 dB). Colour-coded visualisation (green to red based on volume) and animated waves that respond to audio input enhance the experience. Level descriptions include Very Quiet, Quiet, Moderate, Loud, Very Loud, and Extremely Loud. - File Management: Automatic saving with date and time stamps ensures recordings are saved in the app documents directory. Organised recordings are stored with metadata using SQLite, and recording duration tracking and maximum amplitude tracking for each recording are available. - Notes Functionality: Add notes to recordings during or after recording, and edit notes at any time. Include start and end times, a description of the noise and how it affects you. Notes are stored with recording metadata. - Calendar View: An interactive calendar displays days with recordings, allowing you to tap any date to view recordings from that day. Visual indicators for dates with recordings and an organised monthly view with easy navigation enhance the calendar experience. - Audio Playback: Built-in audio playback for each recording includes a progress bar with a time display, play/pause controls, and seek functionality. - Sharing Capabilities: Share recordings and PDF diary via email, messaging, or any installed sharing app. Export recordings to cloud services like Dropbox or Google Drive, and share with notes included as text. - Additional Features: Delete recordings with confirmation, display recording duration, and add format labels on each recording. The app features a modern Material Design 3 UI and a dark-themed noise meter. Bottom navigation allows easy switching between Record and Calendar views.

About

Hidden Camera Detector

This app guides you through inspecting unfamiliar spaces for hidden cameras using visual lens detection, nearby device scanning, and magnetic field readings. It provides structured checklists and on-device reports to help you make informed judgments about suspicious devices.

Highlights
  • Visual lens detection with multiple filters
  • Nearby device scanning (Bluetooth & Wi-Fi)
  • Magnetic field scanner
  • Guided inspection checklists
  • On-device scan reports
  • Training and tips for inspection
Features
Read full description

Inspect hotels, rentals, offices, and unfamiliar rooms with one clear, guided workflow. Hidden Camera Detector combines lens-reflection tools, nearby Bluetooth and Wi‑Fi scanning, magnetic-field readings, and a room-by-room checklist. Use each signal as part of a structured inspection designed to reduce guesswork and highlight what deserves a closer look. ONE WORKFLOW. MULTIPLE SIGNALS. LENS CHECK Use the live camera view and multiple filters to make reflections and possible lens glints easier to notice. Adjust exposure, switch cameras, control the flashlight, or use Color Cycle, Brightness Ramp, and Auto Sweep for different visual conditions. NEARBY DEVICES Use Radar to review Bluetooth devices with signal-strength bars, suspicious indicators, and signal-lost detection. Scan reachable addresses on the local Wi‑Fi network, view your local IP, and identify devices worth investigating. MAGNETIC FIELD Monitor live Bx, By, and Bz readings, total field strength in microtesla, and changes over time on a rolling chart to guide a closer inspection. GUIDED ROOM CHECK Choose a Quick, Balanced, or Thorough scan. Build a checklist around your location, room size, and lighting, then work area by area with progress tracking and practical tips for common hiding places. REPORTED LOCATIONS Explore a map of publicly reported hidden-camera incidents compiled from open online sources. PRIVATE BY DESIGN Lens detection does not record or send images. Permissions are requested only when needed: - Camera: Lens check - Bluetooth: Nearby-device scan - Local Network: Wi‑Fi scan - Notifications: Optional reminders - Location: Optional map position IMPORTANT Hidden Camera Detector makes the most of your phone's camera, Bluetooth, Wi‑Fi, and sensors to help you spot signs of hidden cameras. It is a practical first step for everyday checks, but it does not replace specialized detection equipment or a professional security inspection. Download Hidden Camera Detector and inspect your next space with a clearer, more repeatable process.

Screenshots

Noise Diary4 screens
Hidden Camera Detector4 screens

Verdict

The call

The clearest difference is price: Hidden Camera Detector at Free against Noise Diary's $0.99. Hidden Camera Detector also leads on update cadence (every 3 days vs weekly). Noise Diary's advantage is in-app purchases (none vs 5) and iOS requirement (13.0 vs 18.1). On ads and device support 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

Hidden Camera Detector is free to download; Noise Diary costs $0.99 up front. Hidden Camera Detector sells 5 in-app purchases, starting at $3.99 per 7 days. Noise Diary asks for nothing beyond the download.

UpkeepUpdate frequency

Noise Diary ships an update weekly, Hidden Camera Detector every 3 days. Both last shipped on October 12, 2026.

Scorecard4 real differences · 6 level
Noise Diary versus Hidden Camera Detector: the parameters behind the verdict, then further details
ParameterNoise DiaryHidden Camera Detector
Price$0.99Free — better
Rating—5.0 (6 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—6 — better
Update frequencyWeeklyEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better18.1
Further details — not scored
Size25 MB63 MB
Age rating4+4+
DeveloperChristopher LambArtur Karachev

In-app purchases

None

Noise Diary

No in-app purchases

5 purchases

Hidden Camera Detector

Subscriptions5
  • Premium (1 Week)7 Days trial$3.997 Days
  • Premium (1 Week)$3.997 Days
  • Premium (1 Year)$9.991 Year
Show 2 more
  • Premium (1 Year)7 Days trial$19.991 Year
  • Premium (1 Year)$19.991 Year

Questions

Is Noise Diary free?
Noise Diary costs $0.99, with no in-app purchases.
Is Hidden Camera Detector free?
Hidden Camera Detector is free to download, with in-app purchases available.
Do Noise Diary or Hidden Camera Detector have ads?
Neither Noise Diary nor Hidden Camera Detector shows ads.
Which is updated more often, Noise Diary or Hidden Camera Detector?
Noise Diary ships an update weekly, and Hidden Camera Detector every 3 days. Most recently, Noise Diary was updated on October 12, 2026 and Hidden Camera Detector on October 12, 2026.

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