# SDO Viewer vs Hubble

SDO Viewer and Hubble both sit at 3.0 stars, but that hides the real split: 60% of SDO Viewer's written reviews are positive against 0% of Hubble's. SDO Viewer also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. Hubble sells 1 one-off in-app purchase. SDO Viewer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.0 for SDO Viewer against 3.0 for Hubble. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews are what separate them: 60% of SDO Viewer's written reviews are positive against 0% of Hubble's.

SDO Viewer ships an update every 2 months, Hubble every 23 months. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | SDO Viewer | Hubble |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (5 ratings)](https://appshunter.io/ios/app/sdo-viewer/id913723111/reviews) | [3.0 (2 ratings)](https://appshunter.io/ios/app/hubble-deep-space-2/id1615227352/reviews) |
| Number of ratings | **5** | 2 |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 23 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 6 MB | 1.7 GB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| 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


### Hubble

[App page](https://appshunter.io/ios/app/hubble-deep-space-2/id1615227352)

Explore the universe with stunning images and videos from the Hubble Space Telescope. Discover detailed information about deep space objects and view 3D models. Enjoy an immersive educational experience.

**Highlights:** Browse 550+ high-resolution space photos, Detailed information on space objects, Full-screen slideshow mode, Zoomable image gallery, 220+ educational videos, Interactive 3D models

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hubble: Deep Space 2 - Ad-Free | $0.99 | one-time |


## Frequently asked questions

### Is SDO Viewer free?

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

### Is Hubble free?

Hubble is free to download, with in-app purchases available.

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

SDO Viewer and Hubble are both rated 3.0 out of 5 on the App Store, from 5 and 2 ratings respectively.

### Do SDO Viewer or Hubble have ads?

Hubble shows ads; SDO Viewer does not.

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

SDO Viewer ships an update every 2 months, and Hubble every 23 months. Most recently, SDO Viewer was updated on October 7, 2026 and Hubble on October 16, 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.*