SDO Viewer vs Mars Today
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SDO Viewer
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.
- Download SDO images
- Display latest solar images
- Push notifications for new images
- Courtesy of NASA/SDO science teams
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SDO Viewer is a simple application for downloading and displaying the latest images taken by the Solar Dynamics Observatory (SDO). It includes push notifications so you can be notified by a badge on the application when new images are available. SDO Viewer, by the creator of SoHO Viewer. Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
Mars Today
Access the latest images of Mars from NASA's Curiosity rover. Browse current photos or explore past images from Curiosity, Spirit, and Opportunity by SOL. Bookmark and share your favorite discoveries.
- Latest Mars images from Curiosity
- View past images from Spirit and Opportunity
- Browse by Mars SOL
- Bookmark favorite images
- Easy sharing functionality
- No login required
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Mars Today brings you the latest images of Mars from NASA’s Curiosity rover. You can view the current photos or jump to any Mars SOL to view past photos from Curiosity, Spirit, and Opportunity. Bookmark your favorite images and easily share with your friends. No login required. Explore the red planet today!
Screenshots
Verdict
The clearest difference is rating: Mars Today at 5.0 against SDO Viewer's 3.0. Mars Today also leads on review sentiment (100% vs 60%) and update cadence (monthly vs every 2 months). SDO Viewer's advantage is iOS requirement (13.0 vs 15.2). On price, ratings volume, 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.
Mars Today holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 4 respectively. Written reviews point the same way: 60% of SDO Viewer's written reviews are positive against 100% of Mars Today's.
SDO Viewer ships an update every 2 months, Mars Today monthly. The most recent releases landed on June 1, 2026 and June 11, 2026 respectively.
| Parameter | SDO Viewer | Mars Today |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (5 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 60.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 5 — better | 4 |
| Update frequency | Every 2 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.2 |
| Further details — not scored | ||
| Size | 6 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Jerome Diaz | James Buckhouse |
Customer experience
SDO Viewer
Mars Today
In-app purchases
SDO Viewer
No in-app purchases
Mars Today
No in-app purchases
Questions
Is SDO Viewer free?
Is Mars Today free?
Which has better reviews, SDO Viewer or Mars Today?
Do SDO Viewer or Mars Today have ads?
Which is updated more often, SDO Viewer or Mars Today?
Other comparisons
