DecibelLab vs Flagfall
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
DecibelLab
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DecibelLab is a professional-grade noise measurement and analysis tool that turns your iPhone into a portable sound level meter. Whether you're an audio engineer, a construction safety supervisor, or an everyday user concerned about hearing health, DecibelLab provides precise noise data. β REAL-TIME DECIBEL MEASUREMENT β’ 0-130 dB wide-range detection with real-time response β’ dBA / dBC / dBZ three frequency weightings β’ Slow / Fast / Ultra-fast response modes β’ Five visualizations: Waveform, Bar Chart, Gauge, Heatmap, Radar β FFT SPECTRUM ANALYSIS β’ Octave / 1/3 Octave / FFT three display modes β’ Real-time dominant frequency identification and musical note display β’ Peak hold function β NOISE DOSIMETER β’ NIOSH (85dB/3dB) and OSHA (90dB/5dB) dual standards β’ NC/NR spectrum-based environmental acoustic rating β’ TWA time-weighted average and 8-hour dose percentage β’ Real-time hearing protection risk assessment β INSTADECIBEL CAMERA β’ Real-time decibel data overlaid on camera feed β’ Capture photos and videos with measurements burned into output β’ Front/rear camera switching with auto-focus β PROFESSIONAL REPORT EXPORT β’ PDF detailed report (with timeline, distribution chart, configuration info) β’ PNG high-resolution screenshot (social sharing) β’ CSV raw data (Excel / Numbers analysis) β NOISE ALERTS & PROTECTION β’ Custom dB threshold alerts (vibration + flash + push notification) β’ Auto-trigger recording 10 seconds before and after β’ Decibel reference guide (0-140 dB noise level descriptions) β MORE FEATURES β’ Recording history management with audio playback β’ GPS location tagging for measurements β’ Dark / Light theme β’ Background continuous monitoring β’ 21 languages supported Reference Standards: IEC 61672 / ANSI S1.4 Data Security: All measurement data is stored only on your device Terms of Use: https://tootoostudio.github.io/decibellab-legal/terms-of-use.html Privacy Policy: https://tootoostudio.github.io/decibellab-legal/privacy-policy.html
Flagfall
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Flagfall is a chess clock built for real games β at the club, at a tournament, or across the kitchen table. TIME CONTROLS β’ Fischer increment β time added after every move β’ Bronstein delay β time spent is given back, up to the increment β’ US delay β the clock only starts counting once the delay has elapsed β’ Byo-yomi β main time followed by periods, for go and shogi β’ Multi-stage FIDE controls β 40 moves in 90 minutes, then 30 minutes, with a 30-second increment from move one β’ Asymmetric time β give one player a handicap BUILT FOR THE TABLE The whole half of the screen is the tap target, not a small button. In table mode the top panel rotates 180 degrees for the player sitting opposite, and each side sees the opponent's remaining time the right way up. The screen stays awake for the entire game. Your settings and the game in progress survive closing the app β reopen it and the clock is exactly where you left it, paused. ACCURATE BY DESIGN The clock never decrements a counter on a timer. Remaining time is derived from timestamps, so a backgrounded app, a late frame or a locked screen cannot make it drift. NO ADS, NO ACCOUNT, NO DATA Flagfall makes no network requests. It works entirely offline, collects nothing, and contains no advertising or tracking whatsoever. There is no account to create and nothing to subscribe to. Available in English, French, Spanish, German, Italian, Portuguese, Dutch, Polish, Russian, Turkish, Japanese and Chinese.
Screenshots
Verdict
The clearest difference is in-app purchases: Flagfall at none against DecibelLab's 2. Flagfall also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). DecibelLab's advantage is update cadence (every 2 days vs every 3 weeks). On price and ads 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. DecibelLab sells 2 in-app purchases, starting at $14.99 per year. Flagfall asks for nothing beyond the download.
DecibelLab ships an update every 2 days, Flagfall every 3 weeks. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.
| Parameter | DecibelLab | Flagfall |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days β better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Devices | iPhone | iPhone, iPad, iPod β better |
| Requires iOS | 18.0 | 15.0 β better |
| Further details β not scored | ||
| Size | 15 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | ζ°Έθ³ εΎ | L&L FRANCE |
In-app purchases
DecibelLab
- PRO Annual3 Days trial$14.991 Year
- PRO η»θΊ«η$19.99
Flagfall
No in-app purchases









