# MaxwellsDemon vs Fluid Mechanics Practice

The clearest difference is update cadence: Fluid Mechanics Practice at every 6 days against MaxwellsDemon's every 9 months. On price, ads, in-app purchases and device support there is nothing between them.

MaxwellsDemon costs $0.99 and Fluid Mechanics Practice $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

MaxwellsDemon ships an update every 9 months, Fluid Mechanics Practice every 6 days. The most recent releases landed on November 12, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | MaxwellsDemon | Fluid Mechanics Practice |
| --- | --- | --- |
| Price | $0.99 | **$0.49** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 6 days** |
| Size | 1 MB | 24 MB |
| Requires iOS | 14.4 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Takao Akatsu](https://appshunter.io/developer/1530946331) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### MaxwellsDemon

[App page](https://appshunter.io/ios/app/maxwellsdemon/id1612817641)

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

**In-app purchases:** none


### Fluid Mechanics Practice

[App page](https://appshunter.io/ios/app/fluid-mechanics-practice/id6757950639)

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

**In-app purchases:** none


## Frequently asked questions

### Is MaxwellsDemon free?

MaxwellsDemon costs $0.99, with no in-app purchases.

### Is Fluid Mechanics Practice free?

Fluid Mechanics Practice costs $0.49, with no in-app purchases.

### Do MaxwellsDemon or Fluid Mechanics Practice have ads?

Neither MaxwellsDemon nor Fluid Mechanics Practice shows ads.

### Which is updated more often, MaxwellsDemon or Fluid Mechanics Practice?

MaxwellsDemon ships an update every 9 months, and Fluid Mechanics Practice every 6 days. Most recently, MaxwellsDemon was updated on November 12, 2026 and Fluid Mechanics Practice on November 13, 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.*