# SDG Master vs Noise Meter

The clearest difference is in-app purchases: SDG Master at none against Noise Meter's 9. SDG Master also leads on iOS requirement (13.0 vs 17.6). Noise Meter's advantage is update cadence (every 6 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Noise Meter sells 9 in-app purchases, starting at $5.99 per 7 days. SDG Master asks for nothing beyond the download.

SDG Master ships an update every 3 months, Noise Meter every 6 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SDG Master | Noise Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (15 ratings)](https://appshunter.io/ios/app/noise-meter-keep-quiet/id6744021866/reviews)** |
| Number of ratings | — | **15** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | — | Freemium |
| Size | 260 MB | 72 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Ilija Rushkovski](https://appshunter.io/developer/1446440969) | [Natalia Jakubczyk-Gajewska](https://appshunter.io/developer/1307515292) |

## What reviewers say

### SDG Master

[App page](https://appshunter.io/ios/app/sdg-master/id6738145833)

**Features:** macOS Compatibility

**In-app purchases:** none


### Noise Meter

[App page](https://appshunter.io/ios/app/noise-meter-keep-quiet/id6744021866)

This app helps children understand and manage noise levels through a visual meter and interactive characters. It encourages self-regulation and calm by providing real-time feedback on sound intensity. Ideal for home or educational settings.

**Highlights:** Visual noise meter, Kid-friendly characters reacting to sound, Real-time sound level feedback, Encourages calm and self-regulation, Color-coded noise level bar, Ideal for home and classrooms

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week Premium Subscription | $5.99 | per 7 days |
| 1 Week Premium Subscription | $5.99 | per 7 days |
| Noise Meter Premium | $9.99 | per month |
| Noise Meter Premium | $9.99 | per month |
| Noise Meter Premium | $19.99 | per 3 months |
| Noise Meter Premium | $29.99 | per 6 months |
| Noise Meter Premium | $39.99 | per year |
| Noise Meter Premium | $49.99 | per year |
| Noise Meter Premium | $99.99 | one-time |


## Frequently asked questions

### Is SDG Master free?

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

### Is Noise Meter free?

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

### Do SDG Master or Noise Meter have ads?

Neither SDG Master nor Noise Meter shows ads.

### Which is updated more often, SDG Master or Noise Meter?

SDG Master ships an update every 3 months, and Noise Meter every 6 weeks. Most recently, SDG Master was updated on October 8, 2026 and Noise Meter 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.*