# Cassini HD vs ExplainTime EDU

The clearest difference is price: ExplainTime EDU at Free against Cassini HD's $1.99. ExplainTime EDU also leads on update cadence (every 5 days vs every 2 months). Cassini HD's advantage is iOS requirement (17.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

ExplainTime EDU is free to download; Cassini HD costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Cassini HD ships an update every 2 months, ExplainTime EDU every 5 days. The most recent releases landed on October 13, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Cassini HD | ExplainTime EDU |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/cassini-hd/id556755648/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 94.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Paid | — |
| Size | 124 MB | 23 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Thinx Media Interactive LLC](https://appshunter.io/developer/556755791) | [LORENZO CONFALONIERI](https://appshunter.io/developer/1718083795) |

## 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


### ExplainTime EDU

[App page](https://appshunter.io/ios/app/explaintime-edu-timeline/id6473167138)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cassini HD free?

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

### Is ExplainTime EDU free?

ExplainTime EDU is free to download, with no in-app purchases.

### Do Cassini HD or ExplainTime EDU have ads?

Neither Cassini HD nor ExplainTime EDU shows ads.

### Which is updated more often, Cassini HD or ExplainTime EDU?

Cassini HD ships an update every 2 months, and ExplainTime EDU every 5 days. Most recently, Cassini HD was updated on October 13, 2026 and ExplainTime EDU on October 18, 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.*