iPSマスター vs Primee!
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
iPSマスター
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iPS細胞はどうやって発見されたのでしょうか？ 世紀の大発見なのだからとても複雑な実験がなされたと思われるかもしれませんが、実際にはとてもシンプルで美しい実験により明らかになりました。 iPadアプリ「iPSマスター」では、あなたも山中研究室の一員となって、iPS細胞を発見した時の実験を追体験できます。 さぁ、みなさん、用意はいいですか？ iPS細胞を作り出す研究に挑戦してみましょう！
Primee!
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.
- Tap primes and factor composites
- Mental workout for focus and logic
- Quick 2-minute game sessions
- Global leaderboards
- Satisfying and addictive gameplay
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Sharpen your mind with Primee!, the fast-paced puzzle game for adults and teens who love a real mental challenge. Experience the thrill of a classic arcade game, but for your brain. In Primee!, you don't slice fruit—you slice numbers! Tap the primes, and swipe to slash composite numbers into their prime factors in a uniquely satisfying and addicting challenge. --- PAY ONCE, PLAY FOREVER This is a complete, premium game. No ads. No interruptions. No in-app purchases. Ever. Just pure, focused gameplay. --- FEATURES • A TRUE MENTAL WORKOUT: More than just a math game, it’s a test of your focus, logic, and reflexes, disguised as a simple, addictive game. • QUICK 2-MINUTE GAMES: Ideal for a mental refresh during your commute, break, or any spare moment. • GLOBAL LEADERBOARDS: Climb the ranks on Game Center. Can you become the world's Prime Master? • A PROVEN HIT IN JAPAN: Loved by both puzzle fans and educators in one of the world's most competitive game markets. Ready to challenge your mind? Download Primee! today.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | iPSマスター | Primee! |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 86.7% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 684 MB | 115 MB |
| Age rating | 4+ | 4+ |
| Developer | KYOTO UNIVERSITY | SOFT DEVICE INC. |
In-app purchases
iPSマスター
No in-app purchases
Primee!
No in-app purchases
