# SynLink vs AstroFITS

The clearest difference is rating: SynLink at 4.3 against AstroFITS's 2.0. SynLink also leads on in-app purchases (none vs 1) and device support (4 vs 2). On price, update cadence and ads there is nothing between them.

Both are free to download. AstroFITS sells 1 in-app purchase, starting at $0.99 per year. SynLink asks for nothing beyond the download.

SynLink holds the better App Store score, 4.3 against 2.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

SynLink ships an update fortnightly, AstroFITS monthly. The most recent releases landed on October 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | SynLink | AstroFITS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/synlink/id6739761466/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/astrofits/id6756322104/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 221 MB | 61 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Suzhou UMa Technology Co., Ltd](https://appshunter.io/developer/1786910791) | [yong chong loh](https://appshunter.io/developer/393466709) |

## What reviewers say

### SynLink

[App page](https://appshunter.io/ios/app/synlink/id6739761466)

This professional controller facilitates astrophotography by offering broad compatibility with major camera brands and astronomical equipment. Its design emphasizes simplicity, restraint, and modernity for an intuitive user experience.

**Highlights:** Broad camera compatibility (Fujifilm, Canon, Nikon, Sony), Supports astronomical cameras, Controls equatorial mounts, Manages filter wheels and focusers, Modern and simple interface

**Features:** Vision Pro support

**In-app purchases:** none


### AstroFITS

[App page](https://appshunter.io/ios/app/astrofits/id6756322104)

This app allows users to quickly open and view FITS files on iOS devices using GPU acceleration. It features automatic image stretching and supports various color formats and bit depths, making astronomical image analysis more accessible.

**Highlights:** Open FITS files quickly on iOS, GPU accelerated image processing, Automatic image stretching, Supports RGB and gray color, Handles multiple BITPIX formats, Save adjusted images to Photos

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly Subscription | $0.99 | per year |


## Frequently asked questions

### Is SynLink free?

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

### Is AstroFITS free?

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

### Which has better reviews, SynLink or AstroFITS?

SynLink is rated higher. SynLink averages 4.3 out of 5 from 3 ratings, while AstroFITS averages 2.0 from 1 ratings.

### Do SynLink or AstroFITS have ads?

Neither SynLink nor AstroFITS shows ads.

### Which is updated more often, SynLink or AstroFITS?

SynLink ships an update fortnightly, and AstroFITS monthly. Most recently, SynLink was updated on October 30, 2026 and AstroFITS on October 8, 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.*