# Blood Components vs On

The clearest difference is in-app purchases: Blood Components at none against On's 1. Blood Components also leads on iOS requirement (15.1 vs 17.6). On's advantage is update cadence (weekly vs every 19 months). 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. Blood Components asks for nothing beyond the download.

Blood Components ships an update every 19 months, On weekly. Both last shipped on October 8, 2026.

## The numbers

| Metric | Blood Components | 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 19 months | **Weekly** |
| Monetization | Free | Free |
| Size | 16 MB | 8 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [NHS](https://appshunter.io/developer/1192687136) | [Mohsin Asad Sadiq](https://appshunter.io/developer/1896638622) |

## What reviewers say

### Blood Components

[App page](https://appshunter.io/ios/app/blood-components/id1221434626)

This app provides clinicians with a summary of national guidelines for the appropriate use of blood components. It facilitates robust documentation of transfusion indications, referencing key medical guidelines.

**Highlights:** Summarizes national blood transfusion guidelines, Facilitates appropriate blood use, Enables documentation of transfusion indications, References NBTC, BSH, and NICE guidelines, Acts as a clinical reference tool

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

**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 Blood Components free?

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

### Is On free?

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

### Do Blood Components or On have ads?

Neither Blood Components nor On shows ads.

### Which is updated more often, Blood Components or On?

Blood Components ships an update every 19 months, and On weekly. Most recently, Blood Components was updated on October 8, 2026 and On on October 8, 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.*