# Tau by Turing Dream vs StudyOS

The clearest difference is in-app purchases: Tau by Turing Dream at none against StudyOS's 4. Tau by Turing Dream also leads on iOS requirement (15.0 vs 17.1). On price, update cadence, 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. Tau by Turing Dream asks for nothing beyond the download.

Tau by Turing Dream ships an update every 6 days, StudyOS every 9 days. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Tau by Turing Dream | StudyOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (91 ratings)](https://appshunter.io/ios/app/studyos-study-with-ai/id6747879382/reviews)** |
| Number of ratings | — | **91** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 9 days |
| Monetization | — | Freemium |
| Size | 50 MB | 118 MB |
| Requires iOS | **15.0** | 17.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Turing Dream](https://appshunter.io/developer/1779917404) | [DANIEL PONCELAS VARGAS](https://appshunter.io/developer/1823171837) |

## What reviewers say

### Tau by Turing Dream

[App page](https://appshunter.io/ios/app/tau-by-turing-dream/id6738277444)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Tau by Turing Dream free?

Tau by Turing Dream is free to download, with no in-app purchases.

### Is StudyOS free?

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

### Do Tau by Turing Dream or StudyOS have ads?

Neither Tau by Turing Dream nor StudyOS shows ads.

### Which is updated more often, Tau by Turing Dream or StudyOS?

Tau by Turing Dream ships an update every 6 days, and StudyOS every 9 days. Most recently, Tau by Turing Dream was updated on October 18, 2026 and StudyOS on October 24, 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.*