SoHO Viewer vs Space Time Quest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SoHO Viewer
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.
- Download latest SoHO images
- Display solar images
- Push notifications for new images
- Badge notification for new images
- Image courtesy of SOHO consortium
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SoHO Viewer is a simple application for downloading and displaying the latest images taken by the Solar and Heliospheric Observatory (SoHO). It includes push notifications so you can be notified by a badge on the application when new images are available. It was quoted as “one of the ten best free applications to have on your iphone if you like stargazing:” http://www.networkworld.com/news/2010/112210-free-iphone-stargazing-apps.html It appears in Mars 2015 edition of Sky And Telescope, page 70. Images are courtesy of SOHO consortium. SOHO is a project of international cooperation between ESA and NASA. If you had like to see images taken by Solar Dynamics Observatory (SDO) please use the SDO Viewer application.
Space Time Quest
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.
- Budget management
- Scientific project simulation
- Gravitational wave detector construction
- Subsystem optimization
- Discovery simulation
- Multilingual support
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Have you ever wondered what it would be like to be in charge of a budget of 100 million!? Have you ever wondered what it would be like to manage a continent spanning science project, with the aim of making one of the most important discoveries of the last 50 years? In Space Time Quest you use your scientific skills to build the most sensitive gravitational wave detector ever, and use it to listen to the symphony of the Universe as never before! Spread your budget wisely and optimise the different subsystems of an interferometric gravitational wave detector, of the same type as the real detectors, such as LIGO and Virgo. Be the first to detect the elusive gravitational waves, and the Nobel Prize will surely be yours! Space Time Quest can be played in English, Spanish, Catalan, Dutch, German, Chinese, French, Italian, Russian, Japanese, Hindi and Brazilian Portuguese!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SoHO Viewer | Space Time Quest |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (19 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 69.1% of reviews | — |
| Number of ratings | 19 — better | 1 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 161 MB |
| Age rating | 4+ | 4+ |
| Developer | Jérôme Diaz | Laser Labs |
Customer experience
SoHO Viewer
Space Time Quest
Bugs and requests
SoHO Viewer
Reported bugs
17 issues- 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
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- Images from SoHo viewer not downloading
- App not updating any images
- App won't update pictures past a certain date
- Images do not update
- App is not updating any more
- App not updating
- EIT views have lagged by almost a week
- App won't update no more
- Application not working after last update
- Will not update
- App crashes after 15 seconds
- App not working
Requested features
15 requests- Access to archives
- Add video sequences
- Add H Alpha shots
- Add more information (e.g., solar wind)
- Add zoom function
Show 10 moreShow fewer
- Add close-ups of active regions
- Move masking images to end/beginning
- Add description under each pic (filter, description, UV)
- Add links to 'pic of the week'
- Make it more navigable
- Needs video for reference, like weather radar
- Video clip/slideshow of last N frames
- Automatic save function with frequency setting
- Update iOS for better efficiency
- Update to run more efficiently on phone and iPad
Space Time Quest
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SoHO Viewer
No in-app purchases
Space Time Quest
No in-app purchases
Questions
Is SoHO Viewer free?
Is Space Time Quest free?
Which has better reviews, SoHO Viewer or Space Time Quest?
Do SoHO Viewer or Space Time Quest have ads?
Which is updated more often, SoHO Viewer or Space Time Quest?
Other comparisons
