Good Night System vs Decibel Meter dB Sky
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Good Night System
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.
- Observatory monitoring
- Sleep-time alerts
- iPhone wake-up notifications
- Companion iOS app
- Free PC application available
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The iOS companion for our Good Night System. With this app, your observatory will be monitored while you sleep... at last, and should anything go wrong, your iPhone will wake you up. Before purchasing, please download and try the free app to check everything runs fine. Please visit our web site for details and to download the FREE Windows PC application
Decibel Meter dB Sky
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.
- 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
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How loud is it around you? Keep the moment. Understand the changes. From a bedroom or office to a fan or air conditioner, follow sound changes on a clear dial, save a local recording and revisit the moments that matter. RECORD AND REPLAY FOR FREE • Live reference sound-level estimates, curves, minimum, maximum and average. • Local recording with pause, resume, playback and full history. • User-started recording continues with the screen locked or another app open. • Names, notes, tags, date filters and search. Location is optional. PRO: ONE PURCHASE. NO SUBSCRIPTION. • Photo sound cards: combine a photo, statistics and curve in a PNG. Preview before sharing. • Scene archives: collect observations of the same room, device or place. Filter by date and search. • Timed stop: choose a duration or end time, then start recording yourself. • Monitoring recap and sound timeline: find loud moments, threshold events and the longest low-noise interval. Locate and replay selected clips. • Before-and-after comparison: compare changes and the share of recording time above your chosen threshold. • Recording spectrum: explore relative frequency levels in saved audio and export spectrum CSV. • Share audio and clips; export PDF, CSV, recap images and multi-record reports. Remove ads and unlock advanced reminders. No registration. Recordings and records stay on your device. You decide what to share. The free version includes optional advertising services. Declining tracking does not affect basic recording. Readings are uncalibrated reference estimates affected by the device, microphone and environment. Not for professional, medical or legal evidence use. Photo cards are static images without playable audio. Advanced analysis, scene archives, timed stop and sharing/export require the Pro in-app purchase.
Screenshots
Verdict
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). 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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 21 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | Good Night System | Decibel Meter dB Sky |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 2 |
| Update frequency | Every 6 months — better | Every 21 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 19 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Lunatico Astronomia S. L. | 春豪 李 |
Customer experience
Good Night System
Decibel Meter dB Sky
In-app purchases
Good Night System
No in-app purchases
Decibel Meter dB Sky
- Pro Lifetime Unlock$2.99
Questions
Is Good Night System free?
Is Decibel Meter dB Sky free?
Which has better reviews, Good Night System or Decibel Meter dB Sky?
Do Good Night System or Decibel Meter dB Sky have ads?
Which is updated more often, Good Night System or Decibel Meter dB Sky?
Other comparisons
