SynScan Pro vs H2O Audio PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SynScan Pro
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.
- 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
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Use the SynScan app to control Sky-Watcher telescope mounts via Wi-Fi or Bluetooth LE. Mounts without built-in Wi-Fi can be supported via a SynScan Wi-Fi adapter. This is the Pro version of the SynScan app and contains features suited for expert users using equatorial mounts. Features - Control telescope mount to slew, align, GOTO and track. - Point And Track: track celestial objects (including the Sun and planets) without aligning. - Support gamepad navigation. - Browse a catalog of stars, comets, and deep sky objects. Or, save your own objects. - Provide access to mount for use by third-party apps, including ASCOM clients, SkySafari, Luminos, Stellarium Mobile Plus, Stellarium Desktop or customer-developed apps. Also set up mount alignment for Luminos, Skysafari. - Support access to the mount and the SynScan app from any platform that supports TCP/UDP connections. - Provide emulator mount for testing and practicing. - Track fast-moving earth satellites by working with the PreviSat app on Windows PC or the Lumios app on iOS devices. - Perform polar alignment with or without a polar scope. - Control shutter release (SNAP) port to trigger an attached camera. (Requires mount with SNAP port and adapter cable that matches camera.) - Use ASCOM to perform autoguiding on mounts that do not have autoguider (ST-4) port. - Other mount controls: auto home, PPEC, park.
H2O Audio PRO
This utility app allows users to manage their H2O Audio devices. It provides functionality for updating device software and organizing music playlists.
- Manage H2O Audio Devices
- Update device software
- Manage PLAYLIST+ audio
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Manage H2O Audio Devices, Update software, Manage PLAYLIST+ audio.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 23, 2026 and October 22, 2026 respectively.
| Parameter | SynScan Pro | H2O Audio PRO |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (56 ratings) — better | 1.8 (27 ratings) |
| Positive reviews | 21.5% of reviews — better | 15.8% of reviews |
| Number of ratings | 56 — better | 27 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 46 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Astropower Technology Co. Ltd. | H2O Audio |
Customer experience
SynScan Pro
H2O Audio PRO
In-app purchases
SynScan Pro
No in-app purchases
H2O Audio PRO
No in-app purchases
Questions
Is SynScan Pro free?
Is H2O Audio PRO free?
Which has better reviews, SynScan Pro or H2O Audio PRO?
Do SynScan Pro or H2O Audio PRO have ads?
Which is updated more often, SynScan Pro or H2O Audio PRO?
Other comparisons
