# Civil Twilight Calculator vs Sunsync

The clearest difference is price: Sunsync at Free against Civil Twilight Calculator's $0.99. Civil Twilight Calculator's advantage is update cadence (every 5 months vs every 9 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Sunsync is free to download; Civil Twilight Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Civil Twilight Calculator ships an update every 5 months, Sunsync every 9 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Civil Twilight Calculator | Sunsync |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/civil-twilight-calculator/id1163850946/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 9 months |
| Monetization | Paid | — |
| Size | 8 MB | 95 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aviametrix, LLC](https://appshunter.io/developer/1120306811) | [Clusia LLC](https://appshunter.io/developer/1585054563) |

## What reviewers say

### Civil Twilight Calculator

[App page](https://appshunter.io/ios/app/civil-twilight-calculator/id1163850946)

Calculate precise daylight and twilight times for pilots and outdoor professionals. This app performs all celestial calculations internally, requiring no internet connection for core functionality. It supports GPS locations, global airports, and even addresses when online, with accurate historical and future data.

**Highlights:** Offline celestial calculations, Sunrise and sunset at GPS location, Twilight times (Civil, Nautical, Astronomical), Data for 11,000+ airports, 60 years of historical/future data, Includes FAA regulations

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

**In-app purchases:** none


### Sunsync

[App page](https://appshunter.io/ios/app/sunsync/id6469003195)

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

**In-app purchases:** none


## Frequently asked questions

### Is Civil Twilight Calculator free?

Civil Twilight Calculator costs $0.99, with no in-app purchases.

### Is Sunsync free?

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

### Do Civil Twilight Calculator or Sunsync have ads?

Neither Civil Twilight Calculator nor Sunsync shows ads.

### Which is updated more often, Civil Twilight Calculator or Sunsync?

Civil Twilight Calculator ships an update every 5 months, and Sunsync every 9 months. Most recently, Civil Twilight Calculator was updated on November 3, 2026 and Sunsync on November 7, 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.*