# AstroTool vs SkySync

The clearest difference is in-app purchases: SkySync at none against AstroTool's 1. SkySync also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AstroTool sells 1 one-off in-app purchase. SkySync asks for nothing beyond the download.

AstroTool ships an update every 9 days, SkySync weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | AstroTool | SkySync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/skysync-night-sky-tracker/id6781568212/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Free |
| Size | 3 MB | 24 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [luciano cavazos](https://appshunter.io/developer/1273817106) | [KAHLESON MILES BLANCHARD](https://appshunter.io/developer/6781568214) |

## What reviewers say

### AstroTool

[App page](https://appshunter.io/ios/app/astrotool-night-sky-planner/id6771275558)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AstroTool Premium Unlock | $4.99 | one-time |


### SkySync

[App page](https://appshunter.io/ios/app/skysync-night-sky-tracker/id6781568212)

This app helps you discover and track celestial events like meteor showers and eclipses. It provides countdown timers and customizable notifications so you never miss an opportunity to stargaze. It also features a dark sky finder to locate optimal viewing spots.

**Highlights:** Event calendar (meteor showers, eclipses, moons, comets), Countdown timers to events, Customizable notifications, Dark sky finder with Bortle scale, Minimalist nighttime design, No account required

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

**In-app purchases:** none


## Frequently asked questions

### Is AstroTool free?

AstroTool is free to download, with in-app purchases available.

### Is SkySync free?

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

### Do AstroTool or SkySync have ads?

Neither AstroTool nor SkySync shows ads.

### Which is updated more often, AstroTool or SkySync?

AstroTool ships an update every 9 days, and SkySync weekly. Most recently, AstroTool was updated on October 31, 2026 and SkySync on October 31, 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.*