Cassini HD vs WebMO Premium
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cassini HD
Explore Saturn and its moons through a stunning collection of over 960 NASA images. Navigate an alien world with interactive maps and detailed captions. Save and share your favorite discoveries.
- Over 960 NASA images of Saturn and moons
- Interactive navigation map and thumbnails
- Detailed image captions
- Add images to favorites
- Save images to photo roll
- Social media sharing
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Come on a voyage of discovery to the ringed planet of Saturn with Cassini HD for iPad and iPhone. Navigate a collection of more than 960 spectacular images returned to Earth by NASA's Cassini orbiter while learning about this alien environment in our celestial backyard. The Cassini HD photo collection was carefully selected from thousands of images available courtesy NASA/JPL-Caltech. Browsing this collection takes you on a journey from Saturn itself, beyond its stunning rings, and past more than 20 of its moons. Additional information about each image can be revealed with just a tap. With multiple ways to navigate, Cassini HD becomes an immersive experience guided by your own curiosity: an alphabetical men takes you to any point of interest, while a unique navigation map and thumbnails view allow you to easily scroll through this vast collection. Add images to your favorites to access them quickly, or save them to your photo roll to use as wallpaper or enjoy anytime. Integration with social media adds to the fun as you share your discoveries with family and friends. FEATURES • Journey from Saturn itself, to its stunning rings and past more than 20 different moons • Supports both portrait and landscape orientation for optimal viewing quality. • Full captions expand with additional information with just a tap • Alphabetical menu brings you directly to any section of interest; unique navigation map and thumbnails allow you to scroll easily through this vast collection • Integration with the most popular social networks: Share your discoveries with friends on Facebook and Twitter, or via email • Add images to your favorites for easy access • Save your favorite images to your photo roll and use them as a wallpaper on your iPad or iPhone • Future updates will add to this collection the latest images from Cassini as more become available. "I like to know that even if I'm out of Wi-Fi range, I can always take a trip through Saturn's rings." — Carl Zimmer "worth a download" — TUAW "I give it a rating of 10 rings out of 10." — It's Okay To Be Smart "An excellent app that brings the beauty and magic of this planet right to your fingertips." — Earthscanner
WebMO Premium
This app allows users to build and visualize molecules in 3D, access chemical information from external databases, and interact with advanced computational chemistry programs. It's designed for students and faculty needing mobile access to molecular structures and data.
- 3D molecular editor
- VSEPR and molecular mechanics optimization
- Orbital and symmetry visualization
- Chemical data lookup
- Computational chemistry program integration
- Spectra visualization
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WebMO Premium is equivalent in functionality to the free 'WebMO' app in conjunction with the 'WebMO Premium' in-app purchase. This paid version is provided for convienence for volume purchases. WebMO allows users to build and view molecules in 3-D, visualize orbitals and symmetry elements, lookup chemical information and properties from external databases, and access state-of-the-art computational chemistry programs. WebMO is recommended for students and faculty in high school, college, and graduate school who desire mobile access to molecular structures, information, and calculations. WebMO capabilities include: - Build molecules by drawing atoms and bonds in a 3-D molecular editor, or by speaking the name (e.g., “aspirin”) - Optimize structures using VSEPR theory or molecular mechanics - View Huckel molecular orbitals, electron density, and electrostatic potential - View molecular vibrations - View point group and symmetry elements of molecules - Lookup basic molecular information, including IUPAC and common names, stoichiometry, molar mass - Lookup chemical data from PubChem and ChemSpider - Lookup experimental and predicted molecular properties from external databases (NIST, Sigma-Aldrich) - Lookup IR, UV-VIS, NMR, and mass spectra from external databases (NIST, SDBS) - Capture high-resolution molecular images - Save and recall molecular structures locally - Export and import structures via email WebMO is also a front-end to WebMO servers (version 14 and higher): - Supports Gaussian, GAMESS, Molpro, MOPAC, NWChem, ORCA, PQS, PSI, Quantum Espresso, VASP, Q-Chem, and Tinker computational chemistry programs - Submit, monitor, and view calculations - View formatted tabular data extracted from output files, as well as raw output - Visualize geometry, partial charges, dipole moment, normal vibrational modes, molecular orbitals, and NMR/IR/UV-VIS spectra
Screenshots
Verdict
The clearest difference is update cadence: Cassini HD at every 2 months against WebMO Premium's every 17 months. Cassini HD also leads on review sentiment (94% vs 67%) and rating (4.3 vs 4.0). WebMO Premium's advantage is iOS requirement (12.0 vs 17.0). On ratings volume, ads, in-app purchases and monetization model 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
Cassini HD costs $1.99 and WebMO Premium $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Cassini HD holds the better App Store score, 4.3 against 4.0. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews point the same way: 94% of Cassini HD's written reviews are positive against 67% of WebMO Premium's.
Cassini HD ships an update every 2 months, WebMO Premium every 17 months. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.
| Parameter | Cassini HD | WebMO Premium |
|---|---|---|
| Price | $1.99 — better | $4.99 |
| Rating | 4.3 (6 ratings) — better | 4.0 (4 ratings) |
| Positive reviews | 94.1% of reviews — better | 66.7% of reviews |
| Number of ratings | 6 — better | 4 |
| Update frequency | Every 2 months — better | Every 17 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 124 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Thinx Media Interactive LLC | WebMO, LLC |
Customer experience
Cassini HD
WebMO Premium
In-app purchases
Cassini HD
No in-app purchases
WebMO Premium
No in-app purchases









