# Frequency Counter Hz Tuner vs Coaster Tool

The clearest difference is in-app purchases: Frequency Counter Hz Tuner at none against Coaster Tool's 2. Frequency Counter Hz Tuner also leads on update cadence (every 4 days vs every 4 weeks). Coaster Tool's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Coaster Tool sells 2 one-off in-app purchases. Frequency Counter Hz Tuner asks for nothing beyond the download.

Frequency Counter Hz Tuner ships an update every 4 days, Coaster Tool every 4 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Frequency Counter Hz Tuner | Coaster Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (6 ratings)](https://appshunter.io/ios/app/frequency-counter-hz-tuner/id6761234058/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 4 weeks |
| Monetization | Ad-supported | — |
| Size | 69 MB | 9 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Kyu-Hee Jang](https://appshunter.io/developer/1587578867) | [YangYuXuan Xiao](https://appshunter.io/developer/1213787716) |

## What reviewers say

### Frequency Counter Hz Tuner

[App page](https://appshunter.io/ios/app/frequency-counter-hz-tuner/id6761234058)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Coaster Tool

[App page](https://appshunter.io/ios/app/coaster-tool/id6809840083)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 recordings | $0.99 | one-time |
| Unlimited recordings | $9.99 | one-time |


## Frequently asked questions

### Is Frequency Counter Hz Tuner free?

Frequency Counter Hz Tuner is free to download, with no in-app purchases.

### Is Coaster Tool free?

Coaster Tool is free to download, with in-app purchases available.

### Do Frequency Counter Hz Tuner or Coaster Tool have ads?

Frequency Counter Hz Tuner shows ads; Coaster Tool does not.

### Which is updated more often, Frequency Counter Hz Tuner or Coaster Tool?

Frequency Counter Hz Tuner ships an update every 4 days, and Coaster Tool every 4 weeks. Most recently, Frequency Counter Hz Tuner was updated on October 25, 2026 and Coaster Tool on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*