# Decibel Meter dB Sky vs S4_control

The clearest difference is in-app purchases: S4_control at none against Decibel Meter dB Sky's 1. S4_control also leads on ads (none vs shown) and iOS requirement (9.0 vs 17.0). Decibel Meter dB Sky's advantage is update cadence (every 3 weeks vs every 9 months). On price and device support there is nothing between them.

Both are free to download. Decibel Meter dB Sky sells 1 one-off in-app purchase. S4_control asks for nothing beyond the download.

Decibel Meter dB Sky ships an update every 3 weeks, S4_control every 9 months. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Decibel Meter dB Sky | S4_control |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/decibel-meter-db-sky/id1451820892/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 108 MB |
| Requires iOS | 17.0 | **9.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [春豪 李](https://appshunter.io/developer/1451820891) | [GUANDDONG TIANPU TECHNOLOGY GROUP CO.,LTD.](https://appshunter.io/developer/1637560013) |

## What reviewers say

### Decibel Meter dB Sky

[App page](https://appshunter.io/ios/app/decibel-meter-db-sky/id1451820892)

Measure ambient sound levels with a clear dial and record audio to understand sound changes. Save and replay moments, with advanced features available through a one-time purchase.

**Highlights:** Live sound-level estimates and curves, Local audio recording and playback, Screen-locked recording, Photo sound cards, Scene archives, Timed recording stops, Sound timeline and recap

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime Unlock | $2.99 | one-time |


### S4_control

[App page](https://appshunter.io/ios/app/s4-control/id6532592331)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter dB Sky free?

Decibel Meter dB Sky is free to download, with in-app purchases available.

### Is S4_control free?

S4_control is free to download, with no in-app purchases.

### Do Decibel Meter dB Sky or S4_control have ads?

Decibel Meter dB Sky shows ads; S4_control does not.

### Which is updated more often, Decibel Meter dB Sky or S4_control?

Decibel Meter dB Sky ships an update every 3 weeks, and S4_control every 9 months. Most recently, Decibel Meter dB Sky was updated on November 6, 2026 and S4_control on November 4, 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.*