# StudyOS vs Casys

The clearest difference is in-app purchases: Casys at none against StudyOS's 4. Casys also leads on iOS requirement (15.0 vs 17.1). StudyOS's advantage is update cadence (every 9 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. StudyOS sells 4 in-app purchases, starting at $4.99 per 7 days. Casys asks for nothing beyond the download.

StudyOS ships an update every 9 days, Casys monthly. The most recent releases landed on October 3, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | StudyOS | Casys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (66 ratings)](https://appshunter.io/ios/app/studyos-study-with-ai/id6747879382/reviews)** | — |
| Number of ratings | **66** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Monthly |
| Monetization | Freemium | — |
| Size | 118 MB | 30 MB |
| Requires iOS | 17.1 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DANIEL PONCELAS VARGAS](https://appshunter.io/developer/1823171837) | [Edgar Saban](https://appshunter.io/developer/1862775946) |

## What reviewers say

### StudyOS

[App page](https://appshunter.io/ios/app/studyos-study-with-ai/id6747879382)

Transform your study materials into interactive flashcards, summaries, and quizzes with AI. This app efficiently prepares you for exams and helps you master concepts on the go, making learning faster and more engaging.

**Highlights:** AI-generated flashcards, Automated summaries, Personalized quizzes, Material upload (notes, PDFs, images), Spaced repetition techniques, Progress tracking

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $4.99 | per 7 days |
| Premium Access | $12.99 | per month |
| Premium Access | $12.99 | per month |
| Premium Access | $69.99 | per year |


### Casys

[App page](https://appshunter.io/ios/app/casys/id6756783724)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is StudyOS free?

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

### Is Casys free?

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

### Do StudyOS or Casys have ads?

Neither StudyOS nor Casys shows ads.

### Which is updated more often, StudyOS or Casys?

StudyOS ships an update every 9 days, and Casys monthly. Most recently, StudyOS was updated on October 3, 2026 and Casys on September 25, 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.*