# Guidosimplex vs Sound Meter Master

The clearest difference is in-app purchases: Guidosimplex at none against Sound Meter Master's 5. Guidosimplex also leads on ads (none vs shown). Sound Meter Master's advantage is update cadence (every 4 weeks vs every 28 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Sound Meter Master sells 5 in-app purchases, starting at $1.99 per 7 days. Guidosimplex asks for nothing beyond the download.

Guidosimplex ships an update every 28 months, Sound Meter Master every 4 weeks. The most recent releases landed on October 4, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Guidosimplex | Sound Meter Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 28 months | **Every 4 weeks** |
| Size | 11 MB | 52 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Changzhou Xinder-Tech Electronics Co., Ltd](https://appshunter.io/developer/1402533068) | [Jorge Huertas](https://appshunter.io/developer/1810749286) |

## What reviewers say

### Guidosimplex

[App page](https://appshunter.io/ios/app/guidosimplex/id1549612487)

**In-app purchases:** none


### Sound Meter Master

[App page](https://appshunter.io/ios/app/sound-meter-master/id6745103523)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Access | $1.99 | per 7 days |
| Monthly Premium Access | $3.99 | per month |
| Annual Premium Access | $12.99 | per year |
| Remove Ads Test | $0.99 | one-time |
| Remove Ads | $24.99 | one-time |


## Frequently asked questions

### Is Guidosimplex free?

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

### Is Sound Meter Master free?

Sound Meter Master is free to download, with in-app purchases available.

### Do Guidosimplex or Sound Meter Master have ads?

Sound Meter Master shows ads; Guidosimplex does not.

### Which is updated more often, Guidosimplex or Sound Meter Master?

Guidosimplex ships an update every 28 months, and Sound Meter Master every 4 weeks. Most recently, Guidosimplex was updated on October 4, 2026 and Sound Meter Master on September 27, 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.*