Frequency Analyzer: dB Meter
Sound Spectrogram, SPL & FFT
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Calibrated SPL readings, scrolling spectrograms, NIOSH and OSHA dose tracking, reference tones, and PDF exposure reports. Analyze sound clearly on iPhone in the field.
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
Ratings & Reviews
In this version of Frequency Analyzer, we are bringing small UI improvements and localization polish to make the app clearer and easier to use.
The developer, Ertugrul Sari, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ertugrul Sari
- Size
- 9.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 24 more
- English, Arabic, Czech, Danish, Dutch, Finnish, French, German, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Weekly Subscription $4.99
- Lifetime Access $19.99
- Copyright
- © 2026 Estifie Apps