# Cassini HD vs WebMO Premium

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.

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.

## The numbers

| Metric | Cassini HD | WebMO Premium |
| --- | --- | --- |
| Price | **$1.99** | $4.99 |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/cassini-hd/id556755648/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/webmo-premium/id1448564335/reviews) |
| Number of ratings | **6** | 4 |
| Positive reviews | **94.1% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 17 months |
| Monetization | Paid | Paid |
| Size | 124 MB | 12 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thinx Media Interactive LLC](https://appshunter.io/developer/556755791) | [WebMO, LLC](https://appshunter.io/developer/797898098) |

## What reviewers say

### Cassini HD

[App page](https://appshunter.io/ios/app/cassini-hd/id556755648)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### WebMO Premium

[App page](https://appshunter.io/ios/app/webmo-premium/id1448564335)

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.

**Highlights:** 3D molecular editor, VSEPR and molecular mechanics optimization, Orbital and symmetry visualization, Chemical data lookup, Computational chemistry program integration, Spectra visualization

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cassini HD free?

Cassini HD costs $1.99, with no in-app purchases.

### Is WebMO Premium free?

WebMO Premium costs $4.99, with no in-app purchases.

### Which has better reviews, Cassini HD or WebMO Premium?

Cassini HD is rated higher. Cassini HD averages 4.3 out of 5 from 6 ratings, while WebMO Premium averages 4.0 from 4 ratings.

### Do Cassini HD or WebMO Premium have ads?

Neither Cassini HD nor WebMO Premium shows ads.

### Which is updated more often, Cassini HD or WebMO Premium?

Cassini HD ships an update every 2 months, and WebMO Premium every 17 months. Most recently, Cassini HD was updated on October 13, 2026 and WebMO Premium on October 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*