# Readrush vs Formula Kit

The clearest difference is in-app purchases: Formula Kit at none against Readrush's 4. Readrush's advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Readrush sells 4 in-app purchases, starting at $2.99 per month. Formula Kit asks for nothing beyond the download.

Readrush ships an update every 3 weeks, Formula Kit every 11 days. The most recent releases landed on October 12, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Readrush | Formula Kit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Monetization | — | Paid |
| Size | 55 MB | 61 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [AYSEGUL SEYHAN](https://appshunter.io/developer/1829313037) | [玉良 刘](https://appshunter.io/developer/6777819983) |

## What reviewers say

### Readrush

[App page](https://appshunter.io/ios/app/readrush/id6755315959)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Three Months | $6.99 | per 3 months |
| Six Months | $12.99 | per 6 months |
| Yearly | $19.99 | per year |


### 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 Readrush free?

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

### Is Formula Kit free?

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

### Do Readrush or Formula Kit have ads?

Neither Readrush nor Formula Kit shows ads.

### Which is updated more often, Readrush or Formula Kit?

Readrush ships an update every 3 weeks, and Formula Kit every 11 days. Most recently, Readrush was updated on October 12, 2026 and Formula Kit on October 23, 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.*