# SoHO Viewer vs Space Time Quest

The clearest difference is rating: Space Time Quest at 5.0 against SoHO Viewer's 3.4. Space Time Quest also leads on iOS requirement (8.0 vs 13.0). SoHO Viewer's advantage is ratings volume (19 vs 1). On price, update cadence, 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.

Space Time Quest holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: SoHO Viewer has 19 ratings behind it against 1, so its average is the more settled of the two.

SoHO Viewer ships an update every 2 months, Space Time Quest every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SoHO Viewer | Space Time Quest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (19 ratings)](https://appshunter.io/ios/app/soho-viewer/id356679615/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/space-time-quest/id1282496629/reviews)** |
| Number of ratings | **19** | 1 |
| Positive reviews | 69.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 5 MB | 161 MB |
| Requires iOS | 13.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jérôme Diaz](https://appshunter.io/developer/334987620) | [Laser Labs](https://appshunter.io/developer/1076013854) |

## What reviewers say

### SoHO Viewer

[App page](https://appshunter.io/ios/app/soho-viewer/id356679615)

Access and view the latest images from the Solar and Heliospheric Observatory (SoHO). Receive push notifications when new images are available, keeping you updated on solar activity. This app is a convenient tool for anyone interested in space imagery.

**Highlights:** Download latest SoHO images, Display solar images, Push notifications for new images, Badge notification for new images, Image courtesy of SOHO consortium

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and practical app
- 👍 Good for observing the sun
- 👍 Useful for solar observers
- 👍 Provides current solar images
- 👍 No ads

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 App stopped updating
- 🐛 Images not downloading
- 🐛 App not working
- 🐛 Blacked out for days

**Reported bugs**

- System goes down during solar max
- App is all blacked out
- App has one still image that shows absolute zero
- App stopped updating
- Latest update is a fail, app crashes

**Requested features**

- Access to archives
- Add video sequences
- Add H Alpha shots
- Add more information (e.g., solar wind)
- Add zoom function


### Space Time Quest

[App page](https://appshunter.io/ios/app/space-time-quest/id1282496629)

Manage a massive budget and lead a continent-spanning scientific project to build a gravitational wave detector. Optimize subsystems and be the first to discover elusive gravitational waves to win a Nobel Prize.

**Highlights:** Budget management, Scientific project simulation, Gravitational wave detector construction, Subsystem optimization, Discovery simulation, Multilingual support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SoHO Viewer free?

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

### Is Space Time Quest free?

Space Time Quest is free to download, with no in-app purchases.

### Which has better reviews, SoHO Viewer or Space Time Quest?

Space Time Quest is rated higher. SoHO Viewer averages 3.4 out of 5 from 19 ratings, while Space Time Quest averages 5.0 from 1 ratings.

### Do SoHO Viewer or Space Time Quest have ads?

Neither SoHO Viewer nor Space Time Quest shows ads.

### Which is updated more often, SoHO Viewer or Space Time Quest?

SoHO Viewer ships an update every 2 months, and Space Time Quest every 4 months. Most recently, SoHO Viewer was updated on November 1, 2026 and Space Time Quest on November 3, 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.*