# ASCAR vs Zentobox

The clearest difference is update cadence: Zentobox at every 2 weeks against ASCAR's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

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

ASCAR ships an update every 2 months, Zentobox every 2 weeks. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ASCAR | Zentobox |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 22 MB | 68 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Anaesthesia Cognitive Aids and Research Group Incorporated](https://appshunter.io/developer/1609670504) | [Zento Group](https://appshunter.io/developer/1455940637) |

## What reviewers say

### ASCAR

[App page](https://appshunter.io/ios/app/ascar/id1600414369)

This app provides a comprehensive, up-to-date library of cognitive aids for anaesthetists to support planning and crisis response in operating theatres. It features a paediatric dose calculator and advanced search functionality for quick access to critical information, even offline.

**Highlights:** Complete ASCAR library, Paediatric Dose Calculator, Offline access, Advanced search function, Automatically updated aids

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

**In-app purchases:** none


### Zentobox

[App page](https://appshunter.io/ios/app/zentobox/id6446106646)

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

**In-app purchases:** none


## Frequently asked questions

### Is ASCAR free?

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

### Is Zentobox free?

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

### Do ASCAR or Zentobox have ads?

Neither ASCAR nor Zentobox shows ads.

### Which is updated more often, ASCAR or Zentobox?

ASCAR ships an update every 2 months, and Zentobox every 2 weeks. Most recently, ASCAR was updated on November 3, 2026 and Zentobox 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.*