# Frequency Counter Hz Tuner — Guided Guitar & Ukulele

> iPhone audio analyzer for frequency measurement, instrument tuning, and motor RPM analysis. (iPhone/iPad app by Kyu-Hee Jang.)

- Source: https://appshunter.io/ios/app/frequency-counter-hz-tuner/id6761234058 (this page in markdown: same URL + `.md`)
- Developer: [Kyu-Hee Jang](https://appshunter.io/developer/1587578867)
- Category: Utilities, Productivity
- Price: Free
- Rating: 3.30/5 from 6 App Store ratings · 2 written reviews indexed
- Age rating: 17+
- Requires: iOS 17.0 · 69 MB
- Languages: American English
- Released: 2026-03-31
- Data updated: 2026-10-07
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/frequency-counter-hz-tuner/id6761234058/reviews.md

## What is Frequency Counter Hz Tuner?

Frequency Counter Hz Tuner combines guided instrument tuning with a microphone-based Hz meter, measurement history, tone tools, and an ultrasonic scanner. Use the new guided flow to tune a guitar or ukulele one string at a time, or open the meter when you want to inspect the dominant frequency in a sound.

GUIDED GUITAR AND UKULELE TUNING
Choose guitar or ukulele and work through the strings in order. The guide listens to each string separately. When fresh readings stay within ±5 cents long enough to meet the stability check, the Confirm button becomes available. Tap it to save that string as verified. Each confirmed string records the observed Hz value, cents offset, and verification time. If you stop before finishing, the app saves the partial session and can offer to continue it after relaunch.

INSTRUMENT TUNER
The tuner includes standard string targets for guitar, bass, ukulele, and violin. Adjust the A4 reference when your tuning setup calls for a different reference. Guided string-by-string sessions are available for guitar and ukulele; the other instrument targets remain available in the regular tuner.

DOMINANT FREQUENCY METER
Use the microphone to view the dominant frequency of a sound in Hz. Select Auto, Music, Motor, or Hum mode to match the kind of reading you want to inspect. The meter and tuner provide distinct views, so you can move between a general Hz reading and instrument-focused pitch information without leaving the app.

MEASUREMENT HISTORY
Keep up to 500 measurement records for later reference. Add a note to identify a sound or session, and mark useful records as favorites. The history screen makes it easier to return to selected readings instead of relying on memory or separate notes.

TONE AND SWEEP TOOLS
Generate sine, square, triangle, or sawtooth waves from 20 Hz to 20 kHz. Use a steady tone when you need one frequency, or use sweep mode to move through a range. These controls are grouped in the Tone screen and can support listening, instrument, and audio experiments.

ULTRASONIC SCANNER
Scan the 17–24 kHz band, view the detected peak and a source hint, and review the recent detection log. Microphone response differs by device, especially at high frequencies, so the scanner does not promise that every phone can cover the entire band.

A PRACTICAL MULTI-TOOL FOR SOUND
• Tune guitar or ukulele with a guided string sequence
• Continue a saved partial tuning session after relaunch
• Use standard targets for guitar, bass, ukulele, and violin
• Read dominant sound frequency in Hz through the microphone
• Choose Auto, Music, Motor, or Hum meter modes
• Keep measurement records with notes and favorites
• Generate four waveform types in tone or sweep mode
• Inspect peaks and recent events in the ultrasonic band

Microphone permission is required for listening features. Readings and high-frequency coverage depend on the microphone, device hardware, the sound source, and the surrounding environment. The app is designed as an audio measurement, listening, and instrument-tuning aid.

## Key features

- 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

## Is Frequency Counter Hz Tuner safe?

Not enough ratings yet to assess Frequency Counter Hz Tuner.

## Is Frequency Counter Hz Tuner legit?

Frequency Counter Hz Tuner appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Frequency Counter Hz Tuner is 75 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/frequency-counter-hz-tuner/id6761234058/reviews.md

### 1/5 — The first ad that came up led me to a scam

*2026-08-14*

Tried to scam me

**Developer response:** 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.

### 3/5 — Too many ads

*2026-08-10*

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

**Developer response:** 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.

## Frequently asked questions about Frequency Counter Hz Tuner

### 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.

## Version history (last 5 releases)

### 1.0.45 — 2026-09-24

Guided tuning is now hands-free: play the highlighted string, and once it holds steady within ±5 cents it's confirmed automatically and the next string lights up, so you never have to reach for the screen mid-tune. The tuner needle also glides smoothly to each reading instead of jumping.

### 1.0.44 — 2026-09-14

New guided guitar and ukulele tuning checks one string at a time. Confirmed strings save their Hz and cents results, and partial progress can continue after relaunch.

### 1.0.43 — 2026-08-30

Store screens now show the live frequency meter in 30 languages — Auto Hz, Music A4, Motor RPM and mains-hum lock. Dutch, Danish, Finnish, Czech and Hebrew pages added.

### 1.0.42 — 2026-08-28

50/60Hz hum now lights on the same live counter as Hz, peak and RPM, so mains noise is obvious without switching screens.

### 1.0.41 — 2026-08-17

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!

## Apps similar to Frequency Counter Hz Tuner

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| --- | --- | --- | --- |
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All apps by Kyu-Hee Jang: https://appshunter.io/developer/1587578867

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-07.*