# Pure NMR vs Math Keeper+

The clearest difference is update cadence: Math Keeper+ at every 3 months against Pure NMR's every 8 months. Math Keeper+ also leads on iOS requirement (9.0 vs 26.1). On price, ads, 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.

Pure NMR ships an update every 8 months, Math Keeper+ every 3 months. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Pure NMR | Math Keeper+ |
| --- | --- | --- |
| Price | Free | Free |
| 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 8 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 5 MB | 9 MB |
| Requires iOS | 26.1 | **9.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marcal Casas Cartagena](https://appshunter.io/developer/468150889) | [William Wu](https://appshunter.io/developer/1263494798) |

## What reviewers say

### Pure NMR

[App page](https://appshunter.io/ios/app/pure-nmr/id482490330)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Pure NMR free?

Pure NMR is free to download, with no in-app purchases.

### Is Math Keeper+ free?

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

### Do Pure NMR or Math Keeper+ have ads?

Neither Pure NMR nor Math Keeper+ shows ads.

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

Pure NMR ships an update every 8 months, and Math Keeper+ every 3 months. Most recently, Pure NMR was updated on October 16, 2026 and Math Keeper+ on October 17, 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.*