# Formula to TeX vs Sigmakey

The clearest difference is iOS requirement: Formula to TeX at 17.6 against Sigmakey's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Formula to TeX sells 2 in-app purchases, starting at $2.99 per 7 days and Sigmakey sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Formula to TeX | Sigmakey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/sigmakey-math-keyboard/id6788025133/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Monetization | — | Free with in-app purchases |
| Size | 9 MB | 13 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [VADZIM TSITKO](https://appshunter.io/developer/1713712145) | [Andrii Bashta](https://appshunter.io/developer/1547467775) |

## What reviewers say

### Formula to TeX

[App page](https://appshunter.io/ios/app/formula-to-tex-math-and-physics/id6759269697)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Unlimited Access | $2.99 | per 7 days |
| Yearly Unlimited Access | $24.99 | per year |


### Sigmakey

[App page](https://appshunter.io/ios/app/sigmakey-math-keyboard/id6788025133)

This utility provides a specialized keyboard for typing mathematical expressions, including fractions, roots, and Greek letters, directly within any app. It supports LaTeX, Unicode, and image output, with on-device processing for privacy and speed.

**Highlights:** Full math keyboard layout, Two-dimensional cursor for exponents/numerators, Type LaTeX, Unicode, or rendered image, On-device typesetting, no network required, Symbol search, recent, and favorite symbols

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sigmakey Pro | $9.99 | one-time |


## Frequently asked questions

### Is Formula to TeX free?

Formula to TeX is free to download, with in-app purchases available.

### Is Sigmakey free?

Sigmakey is free to download, with in-app purchases available.

### Do Formula to TeX or Sigmakey have ads?

Neither Formula to TeX nor Sigmakey shows ads.

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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.*