# Good Night System vs Decibel Meter dB Sky

The clearest difference is review sentiment: Decibel Meter dB Sky at 100% against Good Night System's 50%. Decibel Meter dB Sky also leads on rating (5.0 vs 3.7) and update cadence (every 3 weeks vs every 6 months). Good Night System's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

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

Decibel Meter dB Sky holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 50% of Good Night System's written reviews are positive against 100% of Decibel Meter dB Sky's.

Good Night System ships an update every 6 months, Decibel Meter dB Sky every 3 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Good Night System | Decibel Meter dB Sky |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/good-night-system/id646945920/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/decibel-meter-db-sky/id1451820892/reviews)** |
| Number of ratings | **3** | 2 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 19 MB | 11 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lunatico Astronomia S. L.](https://appshunter.io/developer/571006483) | [春豪 李](https://appshunter.io/developer/1451820891) |

## What reviewers say

### Good Night System

[App page](https://appshunter.io/ios/app/good-night-system/id646945920)

This iOS companion app monitors your observatory while you sleep. It will alert you via your iPhone if any issues arise, ensuring peace of mind for astronomers. A free PC application is also available for download.

**Highlights:** Observatory monitoring, Sleep-time alerts, iPhone wake-up notifications, Companion iOS app, Free PC application available

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Good Night System free?

Good Night System is free to download, with no in-app purchases.

### Is Decibel Meter dB Sky free?

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

### Which has better reviews, Good Night System or Decibel Meter dB Sky?

Decibel Meter dB Sky is rated higher. Good Night System averages 3.7 out of 5 from 3 ratings, while Decibel Meter dB Sky averages 5.0 from 2 ratings.

### Do Good Night System or Decibel Meter dB Sky have ads?

Decibel Meter dB Sky shows ads; Good Night System does not.

### Which is updated more often, Good Night System or Decibel Meter dB Sky?

Good Night System ships an update every 6 months, and Decibel Meter dB Sky every 3 weeks. Most recently, Good Night System was updated on November 1, 2026 and Decibel Meter dB Sky on November 6, 2026.

---

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