# Chempuz vs Primee!

The clearest difference is price: Chempuz at Free against Primee!'s $1.99. Chempuz also leads on review sentiment (100% vs 87%) and update cadence (every 5 weeks vs every 2 months). Primee!'s advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Chempuz is free to download; Primee! costs $1.99 up front. Chempuz sells 2 one-off in-app purchases. Primee! asks for nothing beyond the download.

Chempuz ships an update every 5 weeks, Primee! every 2 months. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Chempuz | Primee! |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[4.9 (8 ratings)](https://appshunter.io/ios/app/primee-a-brain-teaser-game/id6504009384/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | **100.0% of reviews** | 86.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 57 MB | 115 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TomatoAppLab](https://appshunter.io/developer/1676711750) | [SOFT DEVICE INC.](https://appshunter.io/developer/1457647052) |

## What reviewers say

### Chempuz

[App page](https://appshunter.io/ios/app/chempuz/id6446211267)

Learn organic chemistry basics by creating molecules and completing puzzles. Trace functional groups to build compounds, score higher with complex structures, and use flashcards to memorize names. Enjoy learning through engaging gameplay.

**Highlights:** Create organic molecules by tracing functional groups, Build approximately 100 types of organic molecules, Score higher with more complex compound creation, Collect discovered compounds, Memorize molecule names with flashcards, Learn organic chemistry through gameplay

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 gem | $0.29 | one-time |
| 10 gems | $1.99 | one-time |


### 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 Chempuz free?

Chempuz is free to download, with in-app purchases available.

### Is Primee! free?

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

### Do Chempuz or Primee! have ads?

Chempuz shows ads; Primee! does not.

### Which is updated more often, Chempuz or Primee!?

Chempuz ships an update every 5 weeks, and Primee! every 2 months. Most recently, Chempuz was updated on November 7, 2026 and Primee! on November 8, 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.*