# KNN vs Professor Ferretto

The clearest difference is review sentiment: KNN at 75% against Professor Ferretto's 25%. KNN also leads on iOS requirement (8.0 vs 16.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KNN ships an update monthly, Professor Ferretto every 3 weeks. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | KNN | Professor Ferretto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/professor-ferretto/id1621502015/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **75.0% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 35 MB | 30 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [KNN Brasil EIRELI](https://appshunter.io/developer/1467516756) | [Ferretto Cursos On Line LTDA](https://appshunter.io/developer/1621502437) |

## What reviewers say

### KNN

[App page](https://appshunter.io/ios/app/knn-idiomas/id1504145600)

Access exclusive educational content, class information, and practice tests to enhance your language learning experience. This app helps you prepare for lessons with audio and tips, and provides a glossary of all words used in textbooks with translations.

**Highlights:** Exclusive educational content, Class preparation with audio and tips, Glossary with translations, Practice tests, Information on school units

**Features:** macOS Compatibility

**In-app purchases:** none


### Professor Ferretto

[App page](https://appshunter.io/ios/app/professor-ferretto/id1621502015)

Access a comprehensive online learning platform with expert instructors for various subjects. Download video lessons for offline viewing and enjoy a user-friendly study environment designed for ENEM and traditional university entrance exam preparation.

**Highlights:** Offline video lessons, Downloadable content, Expert instructors, User-friendly interface, ENEM and Vestibular preparation

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

**In-app purchases:** none


## Frequently asked questions

### Is KNN free?

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

### Is Professor Ferretto free?

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

### Do KNN or Professor Ferretto have ads?

Neither KNN nor Professor Ferretto shows ads.

### Which is updated more often, KNN or Professor Ferretto?

KNN ships an update monthly, and Professor Ferretto every 3 weeks. Most recently, KNN was updated on November 3, 2026 and Professor Ferretto on November 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*