# SDO Viewer vs Spitzer Gallery

The clearest difference is rating: Spitzer Gallery at 5.0 against SDO Viewer's 3.0. Spitzer Gallery also leads on update cadence (weekly vs every 2 months) and iOS requirement (10.0 vs 13.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Spitzer Gallery holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 3 respectively.

SDO Viewer ships an update every 2 months, Spitzer Gallery weekly. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | SDO Viewer | Spitzer Gallery |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (5 ratings)](https://appshunter.io/ios/app/sdo-viewer/id913723111/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/spitzer-gallery/id1493568282/reviews)** |
| Number of ratings | **5** | 3 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | Free |
| Size | 6 MB | 78 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jérôme Diaz](https://appshunter.io/developer/334987620) | [Jose Chavez](https://appshunter.io/developer/1493568281) |

## 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


### Spitzer Gallery

[App page](https://appshunter.io/ios/app/spitzer-gallery/id1493568282)

Explore stunning images captured by NASA's Spitzer Space Telescope. This app offers a gallery of the telescope's mission images, media feeds, and search functionality. View, save, and share high-resolution infrared images.

**Highlights:** Gallery of latest Spitzer images, Spitzer, JPL, and NASA media feed, Search images and media, Full screen image view with pan/zoom, Share images and links, Save images to device, Auto dark/light mode

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SDO Viewer free?

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

### Is Spitzer Gallery free?

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

### Which has better reviews, SDO Viewer or Spitzer Gallery?

Spitzer Gallery is rated higher. SDO Viewer averages 3.0 out of 5 from 5 ratings, while Spitzer Gallery averages 5.0 from 3 ratings.

### Do SDO Viewer or Spitzer Gallery have ads?

Neither SDO Viewer nor Spitzer Gallery shows ads.

### Which is updated more often, SDO Viewer or Spitzer Gallery?

SDO Viewer ships an update every 2 months, and Spitzer Gallery weekly. Most recently, SDO Viewer was updated on October 7, 2026 and Spitzer Gallery on October 2, 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.*