Frequency Counter+ Hz FFT

Frequency Counter+ Hz FFT

Tuner · RPM · 50/60Hz Meter

6 ratings
2 reviews
Free
With Ads

Details

  • Released
  • Updated
  • March 31, 2026
  • August 17, 2026

Features

Frequency Counter+ Hz FFT screenshot #1 for iPhone
Frequency Counter+ Hz FFT screenshot #2 for iPhone
Frequency Counter+ Hz FFT screenshot #3 for iPhone
Frequency Counter+ Hz FFT screenshot #4 for iPhone
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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.

Dominant frequency measurement (Hz)
Instrument tuning with note and pitch display
Motor RPM analysis
50/60 Hz mains hum detection
Measurement history and trend charts
CSV export of measurements
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What's New in Frequency Counter+ Hz FFT

1.0.41

August 17, 2026

The Hum reading is now a true 0.01 Hz measurement: the app times the mains waveform across about a hundred cycles instead of rounding to a tenth. Stopping the tuner or the ultrasonic sweep no longer flashes a full-screen ad under your finger. Thanks for the reviews and feedback!

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User reviews

The first ad that came up led me to a scam

Tried to scam me

Response from developer

That should never have happened and I am sorry it was your first experience of the app. The ads come from Google's ad network rather than from us, but a scam creative is not acceptable and I am reporting it so it can be blocked. Thank you for flagging it - reports like yours are the only way these get caught.

Too many ads

The app works for what I needed, works to test hair clipper rpms. But sometimes the ads get in the way and you can’t even remove them

Response from developer

Thanks — clipper RPM is a good use for this, and I appreciate the detail. On the ad: I tested it and the banner does open expanded over the readouts. There's a small collapse arrow at its top-right that shrinks it, but it reopens each session, so you'd be tapping it every time you measure. I'd rather not pretend that's a fix. If you meant you'd like a way to remove ads entirely, there isn't one today — that's fair feedback and I'm looking at it. Thanks for taking the time to write.

Developer apps

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.