# JRCALC PLUS vs CFR Obs Sim

The clearest difference is update cadence: CFR Obs Sim at every 2 weeks against JRCALC PLUS's every 2 months. JRCALC PLUS's advantage is iOS requirement (15.6 vs 17.0). 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.

JRCALC PLUS ships an update every 2 months, CFR Obs Sim every 2 weeks. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | JRCALC PLUS | CFR Obs Sim |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 23.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 270 MB | 1 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Class Publishing Ltd](https://appshunter.io/developer/884962940) | [Michael D. Thompson](https://appshunter.io/developer/1866976911) |

## What reviewers say

### JRCALC PLUS

[App page](https://appshunter.io/ios/app/jrcalc-plus/id1317027458)

Access up-to-date national and regional prehospital care guidelines for UK professionals. This app provides essential clinical information, including medicines tables and algorithms, for registered trust members. It works offline, ensuring access to critical guidance even without a signal.

**Highlights:** Complete JRCALC Guidelines, Regional and local guidance, Clinical Notices for trusts, Medicines tables, algorithms, and advice, Offline functionality

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

**In-app purchases:** none


### CFR Obs Sim

[App page](https://appshunter.io/ios/app/cfr-obs-sim/id6770991870)

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

**In-app purchases:** none


## Frequently asked questions

### Is JRCALC PLUS free?

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

### Is CFR Obs Sim free?

CFR Obs Sim is free to download, with no in-app purchases.

### Do JRCALC PLUS or CFR Obs Sim have ads?

Neither JRCALC PLUS nor CFR Obs Sim shows ads.

### Which is updated more often, JRCALC PLUS or CFR Obs Sim?

JRCALC PLUS ships an update every 2 months, and CFR Obs Sim every 2 weeks. Most recently, JRCALC PLUS was updated on October 15, 2026 and CFR Obs Sim on October 1, 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.*