SDO Viewer vs CREDO Detector
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.
CREDO Detector
This app enables citizen scientists to contribute to a global cosmic-ray detection network. By using your device's camera, you can help researchers study rare cosmic-ray phenomena, advancing our understanding of cosmology and astrophysics.
- Cosmic-ray particle detection
- Global citizen science network
- Uses device camera matrix
- Publicly available code
- Contributes to astrophysics research
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What is CREDO Science? Cosmic-Ray Extremely Distributed Observatory (CREDO) — Citizen Science collaborative project which enables a strategy for a global analysis of cosmic-ray data to reach the sensitivity to extremely extended cosmic-ray phenomena, we call them Cosmic-Ray Ensembles (CRE), invisible for individual detectors or observatories. So far, the cosmic-ray research has been oriented on detecting single air showers only, while the search for CRE is a scientific terra incognita. We aim at exploring this uncharted realm. Observation of CRE would have an impact on cosmology, fundamental particle interactions and ultra-high energy astrophysics. A large role in the CREDO project is the CREDO Detector mobile app, which uses the camera's matrix to register cosmic-ray particles. By creating a network of users around the globe, we get a cosmic-ray telescope the size of the whole Earth. All application code is public and available on our GitHub. CREDO is an open Citizen Science collaborative project and all collected data are public. In the project participate schools and institutions from 5 continents. If you think your school should join the program, contact us at contact@credo.science. If you have an idea and desire to implement it, you are welcome to join us!
Screenshots
Verdict
The clearest difference is review sentiment: SDO Viewer at 60% against CREDO Detector's 0%. SDO Viewer also leads on rating (3.0 vs 1.4). CREDO Detector's advantage is iOS requirement (11.0 vs 13.0). On price, ratings volume, update cadence and ads 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.
SDO Viewer holds the better App Store score, 3.0 against 1.4. Both are backed by a comparable volume of ratings — 5 and 5 respectively. Written reviews point the same way: 60% of SDO Viewer's written reviews are positive against 0% of CREDO Detector's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 20, 2026 and October 1, 2026 respectively.
| Parameter | SDO Viewer | CREDO Detector |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (5 ratings) — better | 1.4 (5 ratings) |
| Positive reviews | 60.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 5 | 5 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Jérôme Diaz | Michal Frontczak |
Customer experience
SDO Viewer
CREDO Detector
In-app purchases
SDO Viewer
No in-app purchases
CREDO Detector
No in-app purchases
