# Inkray AI vs DuelEng

The clearest difference is update cadence: DuelEng at every 8 days against Inkray AI's every 2 months. Inkray AI's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Inkray AI sells 2 in-app purchases, starting at $4.99 per 7 days and DuelEng sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Inkray AI ships an update every 2 months, DuelEng every 8 days. The most recent releases landed on October 17, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Inkray AI | DuelEng |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/inkray-ai-note-summarizer/id6748240491/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free with in-app purchases | — |
| Size | 67 MB | 28 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Enes Akbal](https://appshunter.io/developer/1818105395) | [Erdener YAVUZ](https://appshunter.io/developer/1874921189) |

## What reviewers say

### Inkray AI

[App page](https://appshunter.io/ios/app/inkray-ai-note-summarizer/id6748240491)

Transform handwritten notes, printed materials, or screenshots into digital text and concise summaries. This AI-powered tool helps students study faster by generating quizzes from notes and organizing all study materials in one place.

**Highlights:** Convert notes to digital text, Summarize long documents, Generate quizzes from notes, Export notes and summaries, Organize study materials, AI-powered learning assistance

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Inkray AI - Pro Weekly | $4.99 | per 7 days |
| Inkray AI - Pro Monthly | $14.99 | per month |


### DuelEng

[App page](https://appshunter.io/ios/app/dueleng/id6782185127)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuelEng Premium Monthly | $3.99 | per month |
| DuelEng Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is Inkray AI free?

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

### Is DuelEng free?

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

### Do Inkray AI or DuelEng have ads?

Both Inkray AI and DuelEng show ads.

### Which is updated more often, Inkray AI or DuelEng?

Inkray AI ships an update every 2 months, and DuelEng every 8 days. Most recently, Inkray AI was updated on October 17, 2026 and DuelEng on October 9, 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.*