# Teorema vs SIGMA MU

The clearest difference is update cadence: Teorema at every 3 weeks against SIGMA MU's every 9 months. 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.

Teorema ships an update every 3 weeks, SIGMA MU every 9 months. The most recent releases landed on October 26, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Teorema | SIGMA MU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 9 months |
| Size | 21 MB | 24 MB |
| Requires iOS | **10.0** | 11.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Ali Group Srl](https://appshunter.io/developer/1755339340) | [ID&A S.r.l.](https://appshunter.io/developer/1446283055) |

## What reviewers say

### Teorema

[App page](https://appshunter.io/ios/app/teorema/id592757378)

**Features:** macOS Compatibility

**In-app purchases:** none


### SIGMA MU

[App page](https://appshunter.io/ios/app/sigma-mu/id6754371829)

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

**In-app purchases:** none


## Frequently asked questions

### Is Teorema free?

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

### Is SIGMA MU free?

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

### Do Teorema or SIGMA MU have ads?

Neither Teorema nor SIGMA MU shows ads.

### Which is updated more often, Teorema or SIGMA MU?

Teorema ships an update every 3 weeks, and SIGMA MU every 9 months. Most recently, Teorema was updated on October 26, 2026 and SIGMA MU on October 7, 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.*