# Frequency Counter Hz Tuner vs SENT Decoder

The clearest difference is ads: SENT Decoder at none against Frequency Counter Hz Tuner's shown. SENT Decoder also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). Frequency Counter Hz Tuner's advantage is update cadence (every 4 days vs every 6 weeks). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Frequency Counter Hz Tuner ships an update every 4 days, SENT Decoder every 6 weeks. The most recent releases landed on October 7, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Frequency Counter Hz Tuner | SENT Decoder |
| --- | --- | --- |
| 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 | No |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 6 weeks |
| Monetization | Ad-supported | — |
| Size | 69 MB | 3 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Kyu-Hee Jang](https://appshunter.io/developer/1587578867) | [Roman Franta](https://appshunter.io/developer/1895145157) |

## 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


### SENT Decoder

[App page](https://appshunter.io/ios/app/sent-decoder/id6767254926)

**In-app purchases:** none


## Frequently asked questions

### Is Frequency Counter Hz Tuner free?

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

### Is SENT Decoder free?

SENT Decoder is free to download, with no in-app purchases.

### Do Frequency Counter Hz Tuner or SENT Decoder have ads?

Frequency Counter Hz Tuner shows ads; SENT Decoder does not.

### Which is updated more often, Frequency Counter Hz Tuner or SENT Decoder?

Frequency Counter Hz Tuner ships an update every 4 days, and SENT Decoder every 6 weeks. Most recently, Frequency Counter Hz Tuner was updated on October 7, 2026 and SENT Decoder on September 18, 2026.

---

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