# iPSマスター vs Primee!

The clearest difference is price: iPSマスター at Free against Primee!'s $1.99. iPSマスター also leads on iOS requirement (8.0 vs 13.0). Primee!'s advantage is device support (3 vs 1). On update cadence, ads and in-app purchases there is nothing between them.

iPSマスター is free to download; Primee! costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iPSマスター ships an update every 4 months, Primee! every 2 months. The most recent releases landed on September 5, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | iPSマスター | Primee! |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/primee-a-brain-teaser-game/id6504009384/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 86.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | — | Paid |
| Size | 684 MB | 115 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KYOTO UNIVERSITY](https://appshunter.io/developer/736070990) | [SOFT DEVICE INC.](https://appshunter.io/developer/1457647052) |

## What reviewers say

### iPSマスター

[App page](https://appshunter.io/ios/app/ips/id1073322395)

**Features:** macOS Compatibility

**In-app purchases:** none


### Primee!

[App page](https://appshunter.io/ios/app/primee-a-brain-teaser-game/id6504009384)

This is a fast-paced puzzle game where players tap prime numbers and swipe to factor composite numbers. It offers a mental workout with quick games and global leaderboards, designed for adults and teens seeking a satisfying challenge.

**Highlights:** Tap primes and factor composites, Mental workout for focus and logic, Quick 2-minute game sessions, Global leaderboards, Satisfying and addictive gameplay

**In-app purchases:** none


## Frequently asked questions

### Is iPSマスター free?

iPSマスター is free to download, with no in-app purchases.

### Is Primee! free?

Primee! costs $1.99, with no in-app purchases.

### Do iPSマスター or Primee! have ads?

Neither iPSマスター nor Primee! shows ads.

### Which is updated more often, iPSマスター or Primee!?

iPSマスター ships an update every 4 months, and Primee! every 2 months. Most recently, iPSマスター was updated on September 5, 2026 and Primee! on September 20, 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.*