DecibelKit vs Frequency Analyzer

DecibelKit turns your iPhone into a precision sound-level meter — built for the moments when "that seems loud" isn't good enough. A true analog dB dial sweeps with the room in real time, backed by a clean digital readout of current, minimum, maximum, and average levels. Tap into the detail the way a pro field meter would: MEASURE LIKE AN INSTRUMENT • Live analog SPL dial with peak-hold and a decaying needle • A and C frequency weighting (dBA / dBC) • Fast and Slow time response, just like a hardware meter • Min / max / average and peak capture for every reading UNDERSTAND YOUR EXPOSURE • Built-in NIOSH noise-dose dosimeter tracks your daily sound exposure • See at a glance when a space crosses into hearing-risk territory KEEP A RECORD (Pro) • Save measurement sessions with full dB-over-time history charts • Review any past session in detail • Export any session to CSV for analysis, reports, or compliance records DIAL IT IN • Calibrate readings against a reference meter for greater accuracy PRIVACY FIRST Audio is analyzed live, on-device, to compute sound levels. It is never recorded, saved, or sent anywhere. DECIBELKIT PRO — ONE-TIME UNLOCK Recording history, the exposure dosimeter, calibration, and CSV export unlock with DecibelKit Pro: a single one-time purchase, yours forever. No subscription. A quick note on accuracy: iPhone microphones are designed for voice, not laboratory-grade acoustic measurement. DecibelKit is excellent for relative readings, monitoring, and awareness, and calibration brings it closer to a reference — but it is not a substitute for a certified Type 1/Type 2 sound-level meter for regulatory or safety-critical use.

Turn your iPhone into a calibrated sound level meter, spectrum analyzer, and noise dosimeter. Built for fieldwork, inspections, and everyday measurements. Whether you are tuning a room, surveying noise on a job site, or checking workplace exposure, Frequency Analyzer gives you the data you need. REAL-TIME SOUND LEVEL METER - Live SPL readout with A, C, and Z weighting plus linear response - Fast (125 ms), Slow (1 s), and custom time averaging - Min, max, average, peak, and LAeq displayed continuously - Configurable reference calibration so your readings match a known source SPECTRUM AND SPECTROGRAM - Real-time FFT spectrum from 20 Hz to 20 kHz, linear or logarithmic axis - Scrolling spectrogram with selectable colormap and peak-hold markers - Octave-band view at 1/1, 1/3, 1/6, or 1/12 resolution - Classic oscilloscope waveform with adjustable time window - Amplitude-over-time history for slow trends across hours NOISE DOSIMETER Track noise exposure against NIOSH and OSHA criteria or a custom standard you define. The app accumulates dose throughout your shift, projects your 8-hour exposure, and reports the time-weighted average. Add event notes and export a PDF report with stats and graphs. REPORTS AND EXPORT - Reference tone generator from 20 Hz to 20 kHz for signal checks - CSV time-series exports for spreadsheets and analysis tools - Spectrogram PNG snapshots at configurable resolution - PDF reports with session statistics, charts, and event markers - Calibration and preferences stored locally on your device PRIVATE BY DESIGN Everything runs on your device. There is no account, no login, and microphone audio does not leave your phone. Sessions, notes, calibration data, and preferences stay in local storage. HOW TO USE 1. Grant microphone access and run the quick calibration walkthrough 2. Choose Analyzer, dB Meter, or Dosimeter from the tab bar 3. Use spectrum, spectrogram, waveform, octave, or amplitude history 4. Watch dose, peak, average, and frequency readings as you measure 5. Export CSV, PNG, or a PDF report when you need results Built for acousticians, safety officers, HVAC inspectors, musicians, and students who want serious acoustic measurement in their pocket. Free to download. Some features require a premium purchase. Privacy Policy: https://estifie.com/apps/frequencyanalyzer/privacy-policy Terms of Use: https://estifie.com/apps/frequencyanalyzer/terms-of-use