# Montluçon vs SoundTach

The clearest difference is in-app purchases: Montluçon at none against SoundTach's 1. SoundTach's advantage is update cadence (every 2 weeks vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SoundTach sells 1 one-off in-app purchase. Montluçon asks for nothing beyond the download.

Montluçon ships an update every 6 weeks, SoundTach every 2 weeks. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Montluçon | SoundTach |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (8 ratings)](https://appshunter.io/ios/app/soundtach/id6755052370/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 29 MB | 51 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AAREON France](https://appshunter.io/developer/814976855) | [XCARAB INC](https://appshunter.io/developer/1724974508) |

## What reviewers say

### Montluçon

[App page](https://appshunter.io/ios/app/montlucon/id6741513360)

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

**In-app purchases:** none


### SoundTach

[App page](https://appshunter.io/ios/app/soundtach/id6755052370)

Measure engine RPM from sound without any tools. Simply point your phone at the exhaust of various engines like motorcycles, cars, or lawn mowers to get accurate, real-time readings. The app automatically filters background noise and indicates signal quality for reliable measurements.

**Highlights:** Automatic RPM detection from sound, Supports 2-stroke and 4-stroke engines, No manual configuration required, Real-time RPM display, Signal quality indicator, Professional and easy-to-read interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access - Pay Once | $4.99 | one-time |


## Frequently asked questions

### Is Montluçon free?

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

### Is SoundTach free?

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

### Do Montluçon or SoundTach have ads?

Neither Montluçon nor SoundTach shows ads.

### Which is updated more often, Montluçon or SoundTach?

Montluçon ships an update every 6 weeks, and SoundTach every 2 weeks. Most recently, Montluçon was updated on November 8, 2026 and SoundTach on October 30, 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.*