# MaPhET vs GRIMMKIDS

The clearest difference is price: GRIMMKIDS at Free against MaPhET's $1.99. GRIMMKIDS also leads on update cadence (every 3 weeks vs every 5 months) and iOS requirement (12.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

GRIMMKIDS is free to download; MaPhET costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MaPhET ships an update every 5 months, GRIMMKIDS every 3 weeks. The most recent releases landed on October 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | MaPhET | GRIMMKIDS |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 13 MB | 214 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jens-Peter Bardt](https://appshunter.io/developer/1571033573) | [GRIMMWELT Kassel gGmbH](https://appshunter.io/developer/1518756454) |

## What reviewers say

### MaPhET

[App page](https://appshunter.io/ios/app/maphet/id1602083319)

This app serves as a comprehensive educational tool, offering a powerful calculator with detailed calculation paths, unit conversions, and a vast collection of formulas for math, physics, and chemistry. It also includes tools for date calculations, random number generation, and geometric figure analysis.

**Highlights:** Advanced calculator with calculation path, Extensive unit conversions, Collection of math, physics, and chemistry formulas, Date difference calculation, Geometric figure analysis, Random number and letter generator

**Features:** Vision Pro support

**In-app purchases:** none


### GRIMMKIDS

[App page](https://appshunter.io/ios/app/grimmkids/id6443987286)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MaPhET free?

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

### Is GRIMMKIDS free?

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

### Do MaPhET or GRIMMKIDS have ads?

Neither MaPhET nor GRIMMKIDS shows ads.

### Which is updated more often, MaPhET or GRIMMKIDS?

MaPhET ships an update every 5 months, and GRIMMKIDS every 3 weeks. Most recently, MaPhET was updated on October 5, 2026 and GRIMMKIDS on September 18, 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.*