# SDO Viewer vs Saturn

The clearest difference is rating: Saturn at 5.0 against SDO Viewer's 2.7. SDO Viewer's advantage is ads (none vs shown) and update cadence (every 2 months vs every 28 months). On price, 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.

Saturn holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: SDO Viewer has 6 ratings behind it against 1, so its average is the more settled of the two.

SDO Viewer ships an update every 2 months, Saturn every 28 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | SDO Viewer | Saturn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (6 ratings)](https://appshunter.io/ios/app/sdo-viewer/id913723111/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/saturn-cassini/id1567740684/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 28 months |
| Monetization | **Free** | Ad-supported |
| Size | 6 MB | 71 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Jérôme Diaz](https://appshunter.io/developer/334987620) | [Alparslan Topbas](https://appshunter.io/developer/1130875171) |

## What reviewers say

### SDO Viewer

[App page](https://appshunter.io/ios/app/sdo-viewer/id913723111)

Access and view the latest images from the Solar Dynamics Observatory. Receive push notifications when new images become available, keeping you updated on solar activity.

**Highlights:** Download SDO images, Display latest solar images, Push notifications for new images, Courtesy of NASA/SDO science teams

**Features:** macOS Compatibility

**In-app purchases:** none


### Saturn

[App page](https://appshunter.io/ios/app/saturn-cassini/id1567740684)

Explore stunning high-definition images and videos of Saturn and its moons. This app offers an interactive 3D experience and detailed insights into the Cassini mission. Discover the wonders of the ringed planet with a modern, visually appealing interface.

**Highlights:** Browse hundreds of stunning Saturn photos, Cinematic slideshow with detailed insights, Interactive gallery with zoom functionality, Watch historic Cassini-Huygens mission videos, Explore interactive 3D models of the Saturn system, Modern glassmorphism UI with dark mode

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

**In-app purchases:** none


## Frequently asked questions

### Is SDO Viewer free?

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

### Is Saturn free?

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

### Which has better reviews, SDO Viewer or Saturn?

Saturn is rated higher. SDO Viewer averages 2.7 out of 5 from 6 ratings, while Saturn averages 5.0 from 1 ratings.

### Do SDO Viewer or Saturn have ads?

Saturn shows ads; SDO Viewer does not.

### Which is updated more often, SDO Viewer or Saturn?

SDO Viewer ships an update every 2 months, and Saturn every 28 months. Most recently, SDO Viewer was updated on October 24, 2026 and Saturn on October 24, 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.*