# PreviewBrowser vs Knoz Teacher

The clearest difference is update cadence: Knoz Teacher at every 6 days against PreviewBrowser's every 7 months. Knoz Teacher also leads on device support (4 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

PreviewBrowser ships an update every 7 months, Knoz Teacher every 6 days. The most recent releases landed on September 17, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | PreviewBrowser | Knoz Teacher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/previewbrowser/id1169214525/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 50 MB | 78 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [NWEA](https://appshunter.io/developer/1087546324) | [Abdelrahman Tolba](https://appshunter.io/developer/1873933530) |

## What reviewers say

### PreviewBrowser

[App page](https://appshunter.io/ios/app/previewbrowser/id1169214525)

This application serves as a specialized tool for educators to review test items on iOS devices. It is designed for use with the Level12 delivery platform and is not intended for general public access.

**Highlights:** Test item review, iOS device compatibility, Level12 platform integration, Educator-specific tool

**In-app purchases:** none


### Knoz Teacher

[App page](https://appshunter.io/ios/app/knoz-teacher/id6759252603)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PreviewBrowser free?

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

### Is Knoz Teacher free?

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

### Do PreviewBrowser or Knoz Teacher have ads?

Neither PreviewBrowser nor Knoz Teacher shows ads.

### Which is updated more often, PreviewBrowser or Knoz Teacher?

PreviewBrowser ships an update every 7 months, and Knoz Teacher every 6 days. Most recently, PreviewBrowser was updated on September 17, 2026 and Knoz Teacher on September 13, 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.*