# RetterTool vs MediSea

The clearest difference is in-app purchases: MediSea at none against RetterTool's 5. MediSea also leads on update cadence (every 5 days vs every 2 months) and review sentiment (100% vs 92%). On price, ads and device support there is nothing between them.

Both are free to download. RetterTool sells 5 in-app purchases, starting at $0.99 per month. MediSea asks for nothing beyond the download.

RetterTool ships an update every 2 months, MediSea every 5 days. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | RetterTool | MediSea |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 91.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 58 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [8devs GmbH](https://appshunter.io/developer/1517839277) | [ANOVA GmbH](https://appshunter.io/developer/1266213532) |

## What reviewers say

### RetterTool

[App page](https://appshunter.io/ios/app/rettertool/id1605575736)

This app provides quick access to essential medical information and calculations for emergency and medical personnel. It includes tools for vital sign measurement, scoring systems, and various medical formulas to aid in patient assessment and treatment.

**Highlights:** Vital sign calculation (heart rate, respiratory rate), Medical scoring systems (qSOFA, APGAR, LAMS, GCS), Memory aids for protocols (ABCDE, SAMPLERS, ISBAR), Formula collection (burns, blood pressure, oxygen), Interactive EKG interpretation tool, Patient age-specific standard values

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro-Version Monatlich | $0.99 | per month |
| Kleines Trinkgeld | $0.99 | one-time |
| Mittleres Trinkgeld | $3.99 | one-time |
| Großes Trinkgeld | $8.99 | one-time |
| Pro-Version Lifetime | $22.99 | one-time |


### MediSea

[App page](https://appshunter.io/ios/app/medisea/id6760551196)

This app provides essential medical information for German-flagged vessels. It offers location-independent access to a digital version of the Maritime Medical Handbook, improving emergency medical care on board ships.

**Highlights:** Digital Maritime Medical Handbook, Location-independent access, Improved emergency care, For German-flagged vessels, Onboard medical information

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

**In-app purchases:** none


## Frequently asked questions

### Is RetterTool free?

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

### Is MediSea free?

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

### Do RetterTool or MediSea have ads?

Neither RetterTool nor MediSea shows ads.

### Which is updated more often, RetterTool or MediSea?

RetterTool ships an update every 2 months, and MediSea every 5 days. Most recently, RetterTool was updated on October 24, 2026 and MediSea 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.*