# SynScan Pro vs OnStep Controller

The clearest difference is iOS requirement: SynScan Pro at 14.0 against OnStep Controller's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | SynScan Pro | OnStep Controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (51 ratings)](https://appshunter.io/ios/app/synscan-pro/id1302270121/reviews)** | — |
| Number of ratings | **51** | — |
| Positive reviews | 21.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Paid | — |
| Size | 46 MB | 7 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Astropower Technology Co. Ltd.](https://appshunter.io/developer/1787940478) | [Gray Digital Arts LLC](https://appshunter.io/developer/1895978400) |

## What reviewers say

### SynScan Pro

[App page](https://appshunter.io/ios/app/synscan-pro/id1302270121)

Control motorized telescope mounts for celestial observation and astrophotography. Features include precise slewing, alignment, GOTO, and tracking of stars, planets, and deep-sky objects. Supports advanced functions like polar alignment and camera triggering.

**Highlights:** Control telescope mount (slew, align, GOTO, track), Point and Track celestial objects, Gamepad navigation support, Catalog of celestial objects, Third-party app integration (ASCOM, SkySafari), Polar alignment (with or without polar scope), Camera shutter release control

**Features:** macOS Compatibility

**In-app purchases:** none


### OnStep Controller

[App page](https://appshunter.io/ios/app/onstep-controller-gda/id6765521295)

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

**In-app purchases:** none


## Frequently asked questions

### Is SynScan Pro free?

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

### Is OnStep Controller free?

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

### Do SynScan Pro or OnStep Controller have ads?

Neither SynScan Pro nor OnStep Controller shows ads.

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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.*