# APT Darkness Clock vs SkySafari 7 Plus

The clearest difference is review sentiment: APT Darkness Clock at 100% against SkySafari 7 Plus's 46%. APT Darkness Clock also leads on price (Free vs $9.99) and in-app purchases (none vs 3). SkySafari 7 Plus's advantage is ratings volume (1.7K vs 5) and chart position (#117 vs unranked). On ads and device support there is nothing between them.

APT Darkness Clock is free to download; SkySafari 7 Plus costs $9.99 up front. SkySafari 7 Plus sells 3 in-app purchases, starting at $4.99 per month. APT Darkness Clock asks for nothing beyond the download.

APT Darkness Clock holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: SkySafari 7 Plus has 1.7K ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 100% of APT Darkness Clock's written reviews are positive against 46% of SkySafari 7 Plus's.

APT Darkness Clock ships an update every 11 days, SkySafari 7 Plus monthly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | APT Darkness Clock | SkySafari 7 Plus |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/apt-darkness-clock/id1351332907/reviews)** | [4.7 (1.7K ratings)](https://appshunter.io/ios/app/skysafari-7-plus/id1567654881/reviews) |
| Number of ratings | 5 | **1.7K** |
| Positive reviews | **100.0% of reviews** | 45.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#117** |
| Size | 1 MB | 1.1 GB |
| Requires iOS | **10.0** | 14.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ivaylo Stoynov](https://appshunter.io/developer/1351332906) | [Simulation Curriculum Corp.](https://appshunter.io/developer/791341744) |

## What reviewers say

### APT Darkness Clock

[App page](https://appshunter.io/ios/app/apt-darkness-clock/id1351332907)

This app calculates the optimal times for deep sky astrophotography and observation based on your location and night sky conditions. It determines the duration and start/end times of ideal darkness, excluding twilight and moonlight.

**Highlights:** Calculates Deep Sky Darkness Time (DSD Time), Determines start and end times for DSD Time, Calculates DSD Time duration, Supports current location, Allows storing up to three observing sites, Free and ad-free

**Features:** macOS Compatibility

**In-app purchases:** none


### SkySafari 7 Plus

[App page](https://appshunter.io/ios/app/skysafari-7-plus/id1567654881)

**Currently charting:** #117 Top Paid · Reference (US App Store)

Explore the cosmos with a powerful space simulator and telescope control. Discover astronomical events, track celestial objects, and plan your stargazing sessions with real-time data and historical simulations.

**Highlights:** Full-featured space simulator, Telescope control (ASCOM Alpaca, INDI), Events Finder for astronomical occurrences, Real-time user observation tracking (OneSky), Guided stargazing sessions (SkyCast), Observation planning and recording tools, Home and Lock Screen widgets

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkySafari Premium Monthly | $4.99 | per month |
| SkySafari Premium | $34.99 | per year |
| Apollo Lunar Missions | Free | one-time |

**What reviewers like**

- 🚀 Great app, preferred over Stellarium
- 👍 Intuitive and clean interface
- 👍 Useful 'Tonight' tab
- 👍 Accurate and precise for telescope use
- 👍 Impressive data and functionality

**What reviewers complain about**

- 🙄 Constant upgrade spam and notifications
- 🐛 'Tonight' feature crashes on iPad
- 💰 Paid features hidden behind paywall
- 🐛 Crashes when using 'Tonight' feature
- 🐛 Syncing and connectivity issues

**Reported bugs**

- 'Tonight' feature crashes
- App crashes on launch or when using certain features
- Connectivity issues with telescopes
- Syncing problems between devices

**Requested features**

- Add more telescope brands and models
- Improve notification settings to only show relevant events
- Allow hiding of menu bar for cleaner viewing
- Improve font sizes and readability
- Add ability to import observation records from previous versions


## Frequently asked questions

### Is APT Darkness Clock free?

APT Darkness Clock is free to download, with no in-app purchases.

### Is SkySafari 7 Plus free?

SkySafari 7 Plus costs $9.99, and also offers in-app purchases.

### Which has better reviews, APT Darkness Clock or SkySafari 7 Plus?

APT Darkness Clock is rated higher. APT Darkness Clock averages 5.0 out of 5 from 5 ratings, while SkySafari 7 Plus averages 4.7 from 1.7K ratings.

### Do APT Darkness Clock or SkySafari 7 Plus have ads?

Neither APT Darkness Clock nor SkySafari 7 Plus shows ads.

### Which is updated more often, APT Darkness Clock or SkySafari 7 Plus?

APT Darkness Clock ships an update every 11 days, and SkySafari 7 Plus monthly. Most recently, APT Darkness Clock was updated on October 24, 2026 and SkySafari 7 Plus on October 25, 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.*