# Dux AI vs Formula Kit

The clearest difference is in-app purchases: Formula Kit at none against Dux AI's 2. Formula Kit also leads on review sentiment (100% vs 67%) and device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Dux AI sells 2 in-app purchases, starting at $2.99 per month. Formula Kit asks for nothing beyond the download.

Dux AI ships an update weekly, Formula Kit every 11 days. The most recent releases landed on October 14, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Dux AI | Formula Kit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | **Freemium** | Paid |
| Size | 8 MB | 61 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ariel Walters](https://appshunter.io/developer/1850200463) | [玉良 刘](https://appshunter.io/developer/6777819983) |

## What reviewers say

### Dux AI

[App page](https://appshunter.io/ios/app/dux-ai-assignment-and-grade-app/id6754808286)

Get instant academic feedback on your assignments before submission. This AI-powered tool offers detailed critiques, grade predictions, and step-by-step explanations for math and science problems. Track your progress and improve your grades across all subjects.

**Highlights:** Instant assignment marking, Detailed academic feedback, AI grade calculator, Math and science step-by-step feedback, Assignment progress tracker, Essay grading and rubric scoring

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dux AI Monthly Plan | $2.99 | per month |
| Dux AI Yearly Plan | $9.99 | 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 Dux AI free?

Dux AI 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 Dux AI or Formula Kit have ads?

Neither Dux AI nor Formula Kit shows ads.

### Which is updated more often, Dux AI or Formula Kit?

Dux AI ships an update weekly, and Formula Kit every 11 days. Most recently, Dux AI was updated on October 14, 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.*