Frequency Counter+ Hz FFT
Audio Tone & Sound Analyzer
About
This app transforms your iPhone into a powerful audio analyzer. It offers four distinct modes to measure sound frequencies, tune instruments, analyze motor speeds, and check mains stability. Advanced features include measurement history, comparison tools, and CSV export.
What's New in Frequency Counter+ Hz FFT
1.0.31
July 7, 2026
New: a frequency Sweep generator in the Tone tab — set start and end frequency, duration (5–60s), and linear or log sweep, with a live progress readout. Thanks for the reviews and feedback!
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FAQ
What is Frequency Counter+ Hz FFT?
Frequency Counter+ Hz FFT is a utility app that uses your iPhone's microphone to analyze audio frequencies. It offers modes for instrument tuning, motor RPM measurement, and mains hum detection.
Does Frequency Counter+ Hz FFT have ads?
Yes, Frequency Counter+ Hz FFT contains advertisements. As it is a free application, ads are used to support its development and maintenance.
What devices does Frequency Counter+ Hz FFT support?
Frequency Counter+ Hz FFT is available for iPhone and iPod touch devices. It is designed to utilize the microphone capabilities of these Apple products.
How accurate is the frequency measurement in Frequency Counter+ Hz FFT?
The app provides precise dominant frequency measurement in Hz. It also includes microphone calibration to fine-tune accuracy in ±0.1 Hz steps.
Can I save and compare measurements with Frequency Counter+ Hz FFT?
Yes, Frequency Counter+ Hz FFT automatically saves readings with a 7-day trend chart. You can add notes, mark favorites, and use the Compare Mode to view differences between saved measurements.
What is the age rating for Frequency Counter+ Hz FFT?
Frequency Counter+ Hz FFT has an age rating of 17+. This rating is determined by app store guidelines and may reflect the complexity or potential use cases of the application.
How often is Frequency Counter+ Hz FFT updated?
The latest version of Frequency Counter+ Hz FFT is 1.0.24, last updated on June 19, 2026. Updates typically bring new features, bug fixes, and performance improvements.
Can I export my frequency data from Frequency Counter+ Hz FFT?
Yes, Frequency Counter+ Hz FFT supports CSV export, allowing you to share all your saved measurements for use in spreadsheets or other data analysis tools.