# Tai Chi Math vs Trajectory

The clearest difference is device support: Tai Chi Math at 4 against Trajectory's —. Tai Chi Math also leads on iOS requirement (15.0 vs 18.5). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Tai Chi Math | Trajectory |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 5 days | — |
| Size | 158 MB | 2 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | **iPhone, iPad, iPod, Mac** | — |
| Age rating | 4+ | 17+ |
| Developer | [Mind Body Aware Games LLC](https://appshunter.io/developer/1018615903) | [Mathieu Bonte](https://appshunter.io/developer/1876251649) |

## What reviewers say

### Tai Chi Math

[App page](https://appshunter.io/ios/app/tai-chi-math/id6757789036)

**In-app purchases:** none


### Trajectory

[App page](https://appshunter.io/ios/app/trajectory-weight-tracker/id6759000055)

**In-app purchases:** none


## Frequently asked questions

### Is Tai Chi Math free?

Tai Chi Math is free to download, with no in-app purchases.

### Is Trajectory free?

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

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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.*