# IPST MOTION vs Starfish Class

The clearest difference is ads: IPST MOTION at none against Starfish Class's shown. IPST MOTION also leads on iOS requirement (8.0 vs 12.1). On price, update cadence, in-app purchases and device support there is nothing between them.

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

IPST MOTION ships an update every 2 months, Starfish Class every 4 months. The most recent releases landed on October 4, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | IPST MOTION | Starfish Class |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 4 months |
| Size | 178 MB | 76 MB |
| Requires iOS | **8.0** | 12.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Institute for the Promotion of Teaching Science and Technology (IPST)](https://appshunter.io/developer/643591471) | [MINDNOVATE COMPANY LIMITED](https://appshunter.io/developer/1488051251) |

## What reviewers say

### IPST MOTION

[App page](https://appshunter.io/ios/app/ipst-motion/id1138267263)

**Features:** macOS Compatibility

**In-app purchases:** none


### Starfish Class

[App page](https://appshunter.io/ios/app/starfish-class/id1488051252)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IPST MOTION free?

IPST MOTION is free to download, with no in-app purchases.

### Is Starfish Class free?

Starfish Class is free to download, with no in-app purchases.

### Do IPST MOTION or Starfish Class have ads?

Starfish Class shows ads; IPST MOTION does not.

### Which is updated more often, IPST MOTION or Starfish Class?

IPST MOTION ships an update every 2 months, and Starfish Class every 4 months. Most recently, IPST MOTION was updated on October 4, 2026 and Starfish Class on September 25, 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.*