# Critical Care Visitors vs On

The clearest difference is in-app purchases: Critical Care Visitors at none against On's 1. Critical Care Visitors also leads on iOS requirement (13.0 vs 17.6). On's advantage is update cadence (weekly vs every 3 weeks). On price, review sentiment, ads and monetization model there is nothing between them.

Both are free to download. On sells 1 one-off in-app purchase. Critical Care Visitors asks for nothing beyond the download.

Critical Care Visitors ships an update every 3 weeks, On weekly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Critical Care Visitors | On |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 21 MB | 8 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Nottingham University Hospitals](https://appshunter.io/developer/1571943185) | [Mohsin Asad Sadiq](https://appshunter.io/developer/1896638622) |

## What reviewers say

### Critical Care Visitors

[App page](https://appshunter.io/ios/app/critical-care-visitors/id1506020949)

This app offers guidance and information for visitors to critical care units at Nottingham University Hospitals. It provides details on procedures, visiting times, facilities, and technical terms in an easy-to-navigate format.

**Highlights:** Color-coded information pages, Collapsible sections, Explanations of procedures and terms, Visiting times and facilities details, Offline access, Auto-update functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### On

[App page](https://appshunter.io/ios/app/on-call/id6769200317)

Manage on-call shifts and track medical jobs efficiently. Prioritize workload, generate handover summaries instantly, and ensure data privacy with local storage. Designed by a doctor for fast, secure use during busy shifts.

**Highlights:** Track urgent and routine jobs, Prioritize workload, Generate structured handover summaries, Secure local data storage, Face ID protection, Fast and intuitive interface

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $2.99 | one-time |


## Frequently asked questions

### Is Critical Care Visitors free?

Critical Care Visitors is free to download, with no in-app purchases.

### Is On free?

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

### Do Critical Care Visitors or On have ads?

Neither Critical Care Visitors nor On shows ads.

### Which is updated more often, Critical Care Visitors or On?

Critical Care Visitors ships an update every 3 weeks, and On weekly. Most recently, Critical Care Visitors was updated on November 3, 2026 and On on October 31, 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.*