# Code Blue Sentry vs Flatliner

The clearest difference is monetization model: Flatliner at free with in-app purchases against Code Blue Sentry's subscription. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Code Blue Sentry sells 3 in-app purchases, starting at $0.99 per 3 months and Flatliner sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Code Blue Sentry against 5.0 for Flatliner. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Code Blue Sentry ships an update every 3 weeks, Flatliner monthly. Both last shipped on September 13, 2026.

## The numbers

| Metric | Code Blue Sentry | Flatliner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/code-blue-sentry/id6749660012/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/flatliner-code-blue-recorder/id6751251620/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 41 MB | 46 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Brian Mun](https://appshunter.io/developer/1830877967) | [Faisal Baabbad](https://appshunter.io/developer/1829799045) |

## What reviewers say

### Code Blue Sentry

[App page](https://appshunter.io/ios/app/code-blue-sentry/id6749660012)

This app helps medical professionals track medications and critical events. It offers customizable ACLS navigation, including checklists and RSI protocols. A free trial is available to assess its utility for pharmacists, registered nurses, and potentially other providers.

**Highlights:** Medication tracking, Event logging, Customizable ACLS navigation, Checklists, RSI protocols, Hs/Ts tracking

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription | $0.99 | per 3 months |
| Subscribe | $0.99 | per 3 months |
| Donate | $4.99 | one-time |


### Flatliner

[App page](https://appshunter.io/ios/app/flatliner-code-blue-recorder/id6751251620)

This app allows medical professionals to meticulously log critical interventions during CPR events in real time. It generates organized summaries for immediate review and professional documentation, aiding in efficient patient care.

**Highlights:** Real-time CPR event logging, CPR code and compression timers, Medication, rhythm, and shock tracking, Epinephrine and pulse check reminders, Chest compression fraction calculator, Built-in metronome, Clean CPR summaries

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flatliner Pro Unlock | $4.99 | one-time |


## Frequently asked questions

### Is Code Blue Sentry free?

Code Blue Sentry is free to download, with in-app purchases available.

### Is Flatliner free?

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

### Which has better reviews, Code Blue Sentry or Flatliner?

Code Blue Sentry and Flatliner are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Code Blue Sentry or Flatliner have ads?

Neither Code Blue Sentry nor Flatliner shows ads.

### Which is updated more often, Code Blue Sentry or Flatliner?

Code Blue Sentry ships an update every 3 weeks, and Flatliner monthly. Most recently, Code Blue Sentry was updated on September 13, 2026 and Flatliner on September 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.*