Comparison

SDO Viewer vs CassiniMIMI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Download SDO images
  • Display latest solar images
  • Push notifications for new images
  • Courtesy of NASA/SDO science teams
Features
Read full description

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.

About

CassiniMIMI

Explore stunning images and data from NASA's Cassini mission to Saturn. This app provides access to energetic particle data, ENA images, and spectrograms from Saturn's magnetosphere. Discover new scientific releases and browse daily updated plots and movies.

Highlights
  • Energetic charged particle environment study
  • Energetic Neutral Atom (ENA) imaging of Saturn
  • Spectrograms and plots from particle detectors
  • Access to NASA's Planetary Data System (PDS)
  • Daily updated plots and movies
  • Selectable data by source, type, date, and style
Features
Read full description

NASA’s Cassini mission to Saturn has provided a unique opportunity for the Magnetospheric IMaging Instruments (MIMI) to study the energetic charged particle environment, and obtain images of Saturn using Energetic Neutral Atom (ENA) imaging. There is a rich dataset of spectrograms, plots, movies, and images that are now accessible via a dedicated iOS app. Among the data products within the MIMI suite that are viewable through the app, include the ENA images of Saturn taken with the Ion and Neutral CAmera (INCA), and spectrograms and line plots from the Low Energy Magnetospheric Measurement System (LEMMS) and CHarge Energy Mass Spectrometer (CHEMS) particle detectors. The instrument health and safety data are restricted to Cassini team members, while the calibrated science data are available to all. The CassiniMIMI app provides easy access to some of Cassini browse products that are currently in NASA’s publically accessible Planetary Data System (PDS). For some products, the public is now able to see the most up-to-date plots produced on a daily basis. Also, the public now has access to new MIMI data products that are only in the process of being released to PDS. The publically available browse products are selectable by source, type, date, style, plots, and movies. Click on the link below to checkout a description of the public menu selections, highlights of the display, samples of public plots and movies, what’s shown in the icon, and links to supporting links, including the Cassini MIMI website, instrument user’s guide, and archive at PDS.

Screenshots

SDO Viewer4 screens
CassiniMIMI4 screens

Verdict

The call

The clearest difference is rating: CassiniMIMI at 5.0 against SDO Viewer's 3.0. CassiniMIMI also leads on review sentiment (100% vs 60%) and update cadence (weekly vs every 2 months). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

CassiniMIMI holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 60% of SDO Viewer's written reviews are positive against 100% of CassiniMIMI's.

UpkeepUpdate frequency

SDO Viewer ships an update every 2 months, CassiniMIMI weekly. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 6 level
SDO Viewer versus CassiniMIMI: the parameters behind the verdict, then further details
ParameterSDO ViewerCassiniMIMI
PriceFreeFree
Rating3.0 (5 ratings)5.0 (2 ratings) — better
Positive reviews60.0% of reviews100.0% of reviews — better
Number of ratings5 — better2
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.08.0 — better
Further details — not scored
Size6 MB19 MB
Age rating4+4+
DeveloperJérôme DiazJohns Hopkins University Applied Physics Laboratory

Customer experience

SDO Viewer

All ratings5 ratings
Positive20.0%
Neutral60.0%
Negative20.0%
Written reviews10 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

CassiniMIMI

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SDO Viewer

No in-app purchases

None

CassiniMIMI

No in-app purchases

Questions

Is SDO Viewer free?
SDO Viewer is free to download, with no in-app purchases.
Is CassiniMIMI free?
CassiniMIMI is free to download, with no in-app purchases.
Which has better reviews, SDO Viewer or CassiniMIMI?
CassiniMIMI is rated higher. SDO Viewer averages 3.0 out of 5 from 5 ratings, while CassiniMIMI averages 5.0 from 2 ratings.
Do SDO Viewer or CassiniMIMI have ads?
Neither SDO Viewer nor CassiniMIMI shows ads.
Which is updated more often, SDO Viewer or CassiniMIMI?
SDO Viewer ships an update every 2 months, and CassiniMIMI weekly. Most recently, SDO Viewer was updated on October 7, 2026 and CassiniMIMI on October 8, 2026.

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