# ODC Tutor vs ShockRef

The clearest difference is update cadence: ShockRef at every 4 days against ODC Tutor's every 2 months. ODC Tutor's advantage is iOS requirement (13.0 vs 26.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ODC Tutor ships an update every 2 months, ShockRef every 4 days. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ODC Tutor | ShockRef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (8 ratings)](https://appshunter.io/ios/app/shockref/id6793122630/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 8 MB | 15 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Satish Deopujari](https://appshunter.io/developer/1180072702) | [Rishi Kumar](https://appshunter.io/developer/1434016052) |

## What reviewers say

### ODC Tutor

[App page](https://appshunter.io/ios/app/odc-tutor/id993661003)

Visualize and understand the oxygen-hemoglobin dissociation curve. This medical tool shows the relationship between oxygen partial pressure and hemoglobin saturation, highlighting factors that shift the curve and critical care points.

**Highlights:** Visualize oxygen-hemoglobin dissociation curve, Shift curve right/left to show affinity changes, Display causes for curve shifts, Show arterial and venous saturation, Indicate P50 value, Highlight ICU point for critical care monitoring

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

**In-app purchases:** none


### ShockRef

[App page](https://appshunter.io/ios/app/shockref/id6793122630)

A clinical reference for managing shock and hemodynamics, offering insights into bedside physiology, resuscitation, and mechanical circulatory support. It includes practical calculators and drug references for critical care professionals and students.

**Highlights:** Shock phenotyping, Resuscitation workflows, Vasoactive drug references, Mechanical circulatory support troubleshooting, Physiology-based critical care, Practical calculators

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

**In-app purchases:** none


## Frequently asked questions

### Is ODC Tutor free?

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

### Is ShockRef free?

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

### Do ODC Tutor or ShockRef have ads?

Neither ODC Tutor nor ShockRef shows ads.

### Which is updated more often, ODC Tutor or ShockRef?

ODC Tutor ships an update every 2 months, and ShockRef every 4 days. Most recently, ODC Tutor was updated on October 21, 2026 and ShockRef 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.*