# SynLink vs Celvion Stack

The clearest difference is price: SynLink at Free against Celvion Stack's $9.90. SynLink also leads on device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On update cadence, ads and in-app purchases there is nothing between them.

SynLink is free to download; Celvion Stack costs $9.90 up front. Neither carries in-app purchases, so what you see is what you pay.

SynLink ships an update fortnightly, Celvion Stack every 2 weeks. The most recent releases landed on September 11, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | SynLink | Celvion Stack |
| --- | --- | --- |
| Price | **Free** | $9.90 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/synlink/id6739761466/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 203 MB | 322 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) | [新庾 郭](https://appshunter.io/developer/6786308122) |

## 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


### Celvion Stack

[App page](https://appshunter.io/ios/app/celvion-stack/id6790672094)

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

**In-app purchases:** none


## Frequently asked questions

### Is SynLink free?

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

### Is Celvion Stack free?

Celvion Stack costs $9.90, with no in-app purchases.

### Do SynLink or Celvion Stack have ads?

Neither SynLink nor Celvion Stack shows ads.

### Which is updated more often, SynLink or Celvion Stack?

SynLink ships an update fortnightly, and Celvion Stack every 2 weeks. Most recently, SynLink was updated on September 11, 2026 and Celvion Stack on September 22, 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.*