# ioda vs Polar Scope Align Pro

The clearest difference is review sentiment: Polar Scope Align Pro at 97% against ioda's 33%. Polar Scope Align Pro also leads on rating (4.9 vs 3.0) and ratings volume (305 vs 2). ioda's advantage is price (Free vs $3.99) and in-app purchases (none vs 3). On ads and device support there is nothing between them.

ioda is free to download; Polar Scope Align Pro costs $3.99 up front. Polar Scope Align Pro sells 3 one-off in-app purchases. ioda asks for nothing beyond the download.

Polar Scope Align Pro holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: Polar Scope Align Pro has 305 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 97% of Polar Scope Align Pro's.

ioda ships an update every 5 months, Polar Scope Align Pro every 2 months. The most recent releases landed on September 27, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | ioda | Polar Scope Align Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/ioda/id412436864/reviews) | **[4.9 (305 ratings)](https://appshunter.io/ios/app/polar-scope-align-pro/id970161373/reviews)** |
| Number of ratings | 2 | **305** |
| Positive reviews | 33.3% of reviews | **97.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#55** |
| Size | 64 MB | 32 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guy Barrand](https://appshunter.io/developer/412436867) | [Dimitrios Kechagias](https://appshunter.io/developer/970157964) |

## What reviewers say

### ioda

[App page](https://appshunter.io/ios/app/ioda/id412436864)

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.

**Highlights:** Read FITS, ROOT, HDF5, JPG, and FOG files, Browse and visualize data, Execute .kumac files, Includes gopaw core, Supports various scientific data schemas

**Features:** macOS Compatibility

**In-app purchases:** none


### Polar Scope Align Pro

[App page](https://appshunter.io/ios/app/polar-scope-align-pro/id970161373)

**Currently charting:** #55 Top Paid · Utilities (US App Store)

This app assists astronomers with precise polar alignment for telescopes, offering tools for various reticles and low-latitude accuracy. It also includes a comprehensive suite of astro tools, from object databases to calculators and weather reports.

**Highlights:** Accurate polar alignment calculation, Support for numerous polar scope reticles, Daytime/no polarscope alignment tool, Deep Space Object database, Astrophotography calculators, World astro-weather report

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip 1x | $0.99 | one-time |
| Tip 4x | $3.99 | one-time |
| Tip 10x | $9.99 | one-time |

**What reviewers like**

- 🚀 Best Polar Alignment App
- 👍 Detailed Instructions and Explanations
- 👍 Fantastic App with Many Useful Features
- 👍 Intuitive and No Distractions
- 👍 Comprehensive Astronomy App

**What reviewers complain about**

- 🐛 Compass Inaccurate
- 🐛 Location Data Inaccurate

**Reported bugs**

- Weather Updates Not Working
- Compass Deflected by Mount

**Requested features**

- Add Observation Recording Feature
- Add Push To Option for DSO Objects


## Frequently asked questions

### Is ioda free?

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

### Is Polar Scope Align Pro free?

Polar Scope Align Pro costs $3.99, and also offers in-app purchases.

### Which has better reviews, ioda or Polar Scope Align Pro?

Polar Scope Align Pro is rated higher. ioda averages 3.0 out of 5 from 2 ratings, while Polar Scope Align Pro averages 4.9 from 305 ratings.

### Do ioda or Polar Scope Align Pro have ads?

Neither ioda nor Polar Scope Align Pro shows ads.

### Which is updated more often, ioda or Polar Scope Align Pro?

ioda ships an update every 5 months, and Polar Scope Align Pro every 2 months. Most recently, ioda was updated on September 27, 2026 and Polar Scope Align Pro on October 15, 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.*