# PhysKey Custom vs Formula Kit

The clearest difference is update cadence: Formula Kit at every 10 days against PhysKey Custom's every 4 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.

PhysKey Custom ships an update every 4 months, Formula Kit every 10 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | PhysKey Custom | Formula Kit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | — | Paid |
| Size | 5 MB | 5 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ryosuke Asano](https://appshunter.io/developer/1858758761) | [玉良 刘](https://appshunter.io/developer/6777819983) |

## What reviewers say

### PhysKey Custom

[App page](https://appshunter.io/ios/app/physkey-custom/id6757507136)

**In-app purchases:** none


### Formula Kit

[App page](https://appshunter.io/ios/app/formula-kit/id6783818766)

Easily create, edit, and export mathematical and scientific formulas with a dedicated LaTeX editor. Features real-time rendering, a custom keyboard, and extensive template library for offline use.

**Highlights:** Real-time LaTeX rendering, Over 400 formula templates, Custom auxiliary keyboard, Image and code export, Formula library and management, Offline functionality, History and preview

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PhysKey Custom free?

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

### Is Formula Kit free?

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

### Do PhysKey Custom or Formula Kit have ads?

Neither PhysKey Custom nor Formula Kit shows ads.

### Which is updated more often, PhysKey Custom or Formula Kit?

PhysKey Custom ships an update every 4 months, and Formula Kit every 10 days. Most recently, PhysKey Custom was updated on October 7, 2026 and Formula Kit on October 6, 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.*