# SDO Viewer vs Hubble

The clearest difference is review sentiment: SDO Viewer at 60% against Hubble's 0%. SDO Viewer also leads on ads (none vs shown) and monetization model (free vs ad-supported). Hubble's advantage is rating (4.4 vs 3.0). On price, ratings volume, 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.

Hubble holds the better App Store score, 4.4 against 3.0. Both are backed by a comparable volume of ratings — 5 and 8 respectively. Written reviews complicate that: 60% of SDO Viewer's written reviews are positive against 0% of Hubble's, so the app with the better star average is not the one people write more warmly about.

SDO Viewer ships an update every 2 months, Hubble every 5 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) | **[4.4 (8 ratings)](https://appshunter.io/ios/app/hubble-deep-space/id1545745146/reviews)** |
| Number of ratings | 5 | **8** |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | **Free** | Ad-supported |
| Size | 6 MB | 2.9 GB |
| 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


### Hubble

[App page](https://appshunter.io/ios/app/hubble-deep-space/id1545745146)

Explore the universe in high definition with stunning images from the Hubble Space Telescope. Discover galaxies, nebulae, and star clusters with detailed descriptions and an immersive slideshow experience. Stay updated with the latest cosmic discoveries.

**Highlights:** High-resolution cosmic image gallery, Immersive slideshow mode, Searchable database of celestial objects, Detailed scientific descriptions, Real-time updates for 'Picture of the Week', Links to NASA/ESA archives

**Features:** macOS Compatibility, Family Sharing, 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 Hubble free?

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

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

Hubble is rated higher. SDO Viewer averages 3.0 out of 5 from 5 ratings, while Hubble averages 4.4 from 8 ratings.

### 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 5 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.*