# DONIA vs Projecte Posidonia

The clearest difference is in-app purchases: Projecte Posidonia at none against DONIA's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. DONIA sells 2 in-app purchases, starting at $2.49 per month. Projecte Posidonia asks for nothing beyond the download.

DONIA ships an update every 4 weeks, Projecte Posidonia fortnightly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | DONIA | Projecte Posidonia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (34 ratings)](https://appshunter.io/ios/app/donia/id751225905/reviews)** | — |
| Number of ratings | **34** | — |
| Positive reviews | 63.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Monetization | Freemium | — |
| Size | 55 MB | 205 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Andromede Oceanologie](https://appshunter.io/developer/740679172) | [INGEMATIC INGENIERIA DE SISTEMAS SL](https://appshunter.io/developer/1461444789) |

## What reviewers say

### DONIA

[App page](https://appshunter.io/ios/app/donia/id751225905)

This app provides detailed seabed visualization and marine information for safe and respectful sea navigation. It allows users to book mooring buoys, share observations, and monitor their vessels. Access premium features like high-definition charts for enhanced planning and exploration.

**Highlights:** Seabed visualization, Marine information access, Mooring buoy booking, User observation sharing, Navigation preparation and monitoring, Mooring monitoring with alarms, Offline mapping

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DONIA® Premium Monthly | $2.49 | per month |
| DONIA® Premium Version | $22.99 | per year |


### Projecte Posidonia

[App page](https://appshunter.io/ios/app/projecte-posidonia/id1635161558)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DONIA free?

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

### Is Projecte Posidonia free?

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

### Do DONIA or Projecte Posidonia have ads?

Neither DONIA nor Projecte Posidonia shows ads.

### Which is updated more often, DONIA or Projecte Posidonia?

DONIA ships an update every 4 weeks, and Projecte Posidonia fortnightly. Most recently, DONIA was updated on November 6, 2026 and Projecte Posidonia on November 3, 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.*