ioda vs SynScan Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ioda
This scientific application allows users to read and visualize data from various file formats commonly used in astronomy and high-energy physics. It supports formats like FITS, ROOT, HDF5, JPG, and FOG, and can execute specific script files.
- Read FITS, ROOT, HDF5, JPG, and FOG files
- Browse and visualize data
- Execute .kumac files
- Includes gopaw core
- Supports various scientific data schemas
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ioda should be read "IO-DA", for Input/Output and for Data Analysis. It is a scientific application that permits to read files at various formats as FITS used in astronomy, ROOT and AIDA used in high energy physics (HEP), HDF5 with the g4tools data schema semantic, JPG format to store images and FOG developed at CEA/Saclay (France) to describe the LHC/ATLAS geometry. ioda permits to browse these files and visualise some of their data. Since 1.14.x, ioda contains the gopaw (=Good Old PAW) core and can execute .kumac files.
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.
Screenshots
Verdict
The clearest difference is monetization model: ioda at free against SynScan Pro's paid. ioda also leads on rating (3.0 vs 2.6) and review sentiment (33% vs 22%). SynScan Pro's advantage is ratings volume (51 vs 2) and update cadence (every 2 months vs every 5 months). On price, ads, in-app purchases and device support 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.
ioda holds the better App Store score, 3.0 against 2.6. That said, the two scores are not equally well evidenced: SynScan Pro has 51 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 33% of ioda's written reviews are positive against 22% of SynScan Pro's.
ioda ships an update every 5 months, SynScan Pro every 2 months. The most recent releases landed on September 27, 2026 and October 9, 2026 respectively.
| Parameter | ioda | SynScan Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | 2.6 (51 ratings) |
| Positive reviews | 33.3% of reviews — better | 21.5% of reviews |
| Number of ratings | 2 | 51 — better |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 64 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Guy Barrand | Astropower Technology Co. Ltd. |
Customer experience
ioda
SynScan Pro
In-app purchases
ioda
No in-app purchases
SynScan Pro
No in-app purchases







