# SynScan Pro vs H2O Audio PRO

The clearest difference is rating: SynScan Pro at 2.7 against H2O Audio PRO's 1.8. H2O Audio PRO's advantage is monetization model (free vs paid). On price, review sentiment, ratings volume and update cadence there is nothing between them.

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

SynScan Pro holds the better App Store score, 2.7 against 1.8. Both are backed by a comparable volume of ratings — 56 and 27 respectively. Written reviews point the same way: 22% of SynScan Pro's written reviews are positive against 16% of H2O Audio PRO's.

SynScan Pro ships an update every 2 months, H2O Audio PRO every 3 months. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | SynScan Pro | H2O Audio PRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (56 ratings)](https://appshunter.io/ios/app/synscan-pro/id1302270121/reviews)** | [1.8 (27 ratings)](https://appshunter.io/ios/app/h2o-audio-pro/id1641826502/reviews) |
| Number of ratings | **56** | 27 |
| Positive reviews | **21.5% of reviews** | 15.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | **Free** |
| Size | 46 MB | 9 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astropower Technology Co. Ltd.](https://appshunter.io/developer/1787940478) | [H2O Audio](https://appshunter.io/developer/1461691451) |

## 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


### H2O Audio PRO

[App page](https://appshunter.io/ios/app/h2o-audio-pro/id1641826502)

This utility app allows users to manage their H2O Audio devices. It provides functionality for updating device software and organizing music playlists.

**Highlights:** Manage H2O Audio Devices, Update device software, Manage PLAYLIST+ audio

**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 H2O Audio PRO free?

H2O Audio PRO is free to download, with no in-app purchases.

### Which has better reviews, SynScan Pro or H2O Audio PRO?

SynScan Pro is rated higher. SynScan Pro averages 2.7 out of 5 from 56 ratings, while H2O Audio PRO averages 1.8 from 27 ratings.

### Do SynScan Pro or H2O Audio PRO have ads?

Neither SynScan Pro nor H2O Audio PRO shows ads.

### Which is updated more often, SynScan Pro or H2O Audio PRO?

SynScan Pro ships an update every 2 months, and H2O Audio PRO every 3 months. Most recently, SynScan Pro was updated on October 24, 2026 and H2O Audio PRO on October 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*