# Math Keeper+ vs Chromatography

The clearest difference is price: Math Keeper+ at Free against Chromatography's $1.99. Math Keeper+ also leads on update cadence (every 3 months vs every 41 months) and iOS requirement (9.0 vs 11.0). On ads, in-app purchases and device support there is nothing between them.

Math Keeper+ is free to download; Chromatography costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Math Keeper+ ships an update every 3 months, Chromatography every 41 months. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Math Keeper+ | Chromatography |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/math-keeper-plus/id1263494799/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 41 months |
| Monetization | Free | — |
| Size | 9 MB | 75 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [William Wu](https://appshunter.io/developer/1263494798) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## What reviewers say

### Math Keeper+

[App page](https://appshunter.io/ios/app/math-keeper-plus/id1263494799)

This app serves as a quick reference for high school math formulas, allowing users to review concepts or add their own notes and formulas. It includes a built-in calculator for convenience.

**Highlights:** Over 100 math formulas, Edit existing formulas, Add custom formulas, Write notes, Built-in calculator

**Features:** macOS Compatibility

**In-app purchases:** none


### Chromatography

[App page](https://appshunter.io/ios/app/chromatography/id1569139868)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Math Keeper+ free?

Math Keeper+ is free to download, with no in-app purchases.

### Is Chromatography free?

Chromatography costs $1.99, with no in-app purchases.

### Do Math Keeper+ or Chromatography have ads?

Neither Math Keeper+ nor Chromatography shows ads.

### Which is updated more often, Math Keeper+ or Chromatography?

Math Keeper+ ships an update every 3 months, and Chromatography every 41 months. Most recently, Math Keeper+ was updated on October 1, 2026 and Chromatography on October 3, 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.*