# ZEN browser vs CAIRIBU

The clearest difference is update cadence: CAIRIBU at every 3 weeks against ZEN browser's every 26 months. CAIRIBU also leads on device support (3 vs 1). ZEN browser's advantage is iOS requirement (9.0 vs 15.1). On price, 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.

ZEN browser ships an update every 26 months, CAIRIBU every 3 weeks. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ZEN browser | CAIRIBU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/zen-browser/id665543029/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 45 MB | 39 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Carl Zeiss AG](https://appshunter.io/developer/488066215) | [Edison Chiu](https://appshunter.io/developer/1816660479) |

## What reviewers say

### ZEN browser

[App page](https://appshunter.io/ios/app/zen-browser/id665543029)

This application allows educators and researchers to navigate and view image databases on iPads. It facilitates collaboration by enabling image sharing, annotation, and Z-stack navigation. Access your research data remotely for presentations and discussions.

**Highlights:** Navigate image databases, View Z-stacks, Insert annotations, Share images with colleagues, Access ZEISS demo server

**In-app purchases:** none


### CAIRIBU

[App page](https://appshunter.io/ios/app/cairibu/id6746400454)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZEN browser free?

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

### Is CAIRIBU free?

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

### Do ZEN browser or CAIRIBU have ads?

Neither ZEN browser nor CAIRIBU shows ads.

### Which is updated more often, ZEN browser or CAIRIBU?

ZEN browser ships an update every 26 months, and CAIRIBU every 3 weeks. Most recently, ZEN browser was updated on October 14, 2026 and CAIRIBU on October 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.*