Comparison

DONIA vs PosidoniaMaps

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DONIA

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
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DONIA – Enjoy & protect the sea, together Donia is the reference app to choose your anchorages and navigate safely while minimizing your impact on the seabed. Join a community of over 100,000 sea enthusiasts who use DONIA to plan and experience their journeys across the Mediterranean and beyond. *** Visualize the seabed and anchor in the right place *** • High-precision mapping of marine habitats (Posidonia, coralligenous reefs, Cymodocea, sand and rock)
• Enhanced anchoring assistance with weather conditions
• Improved anchor alarm system
• Smart selection of anchoring zones adapted to your vessel *** Complete nautical charts *** • Detailed mapping of navigation areas (French Mediterranean, Atlantic, Greece, Andalusia, Liguria, Croatia, Balearics)
• Advanced integration of SHOM charts and HD bathymetric layers (Premium)
• Optimized map display for real-time navigation *** A community of sailors *** • View and share sea observations
• Rating system and favorites
• Easy sharing inside and outside the app *** Donia Mooring – connected buoys *** • Connected mooring buoys for vessels over 24m
• Dedicated anchoring zones
• In-app booking, payment and management *** DONIA Premium *** • Advanced SHOM chart integration
• Access to HD bathymetric layers A mission: protecting the sea Created by marine biologists and divers from Andromède Océanologie, DONIA aims to make seabed maps visible and accessible so everyone can contribute to their protection. Inspired by maritime solidarity, the app continuously evolves based on user feedback to become a more innovative, useful and effective anchoring tool. Information Using GPS in the background may significantly reduce battery life.
 Your subscription renews automatically unless you cancel it at least 24 hours before the end of the current billing period. Payment will be charged to your iTunes account upon confirmation of purchase. You can manage your subscriptions and turn off automatic renewal in your account settings after purchase. Privacy Policy: https://mooring.donia.fr/cgv/donia/cgv-donia-fr.pdf Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

PosidoniaMaps

This app provides high-resolution underwater maps to help boaters navigate and find safe mooring spots, even in poor visibility. It aims to protect vital Posidonia oceanic meadows by making them visible and encouraging responsible anchoring.

Highlights
  • High-resolution underwater maps
  • Safe mooring guidance
  • Low visibility navigation
  • Posidonia meadow mapping
  • Environmental protection tool
Features
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Initiated in Formentera, a project to map Posidonia oceanic meadows and make them visible with an app and google earth. Every square meter of mapped and visible Posidonia is a protected meadow. In the past 50 years, it is estimated 34% of Posidonia meadows have been lost in the Western Mediterranean (Telesca et al., 2015). This loss is due to damage caused by trawlers, boat moorings, coastal development, eutrophication, and pollution. Damage caused by boats’ anchors has been recorded at various coastal marine habitats worldwide; for example, coral reefs (Dinsdale & Harriott, 2004). Anchoring also has negative consequences on Posidonia (Milazzo M., 2004; Francour P., 1999), and has caused the disappearance of large prairies in some areas of the Balearic Islands (San Felix, in press, 1994). This App provides direct access to high-resolution underwater maps to ensure proper mooring even in low visibility conditions.

Screenshots

DONIA4 screens
PosidoniaMaps4 screens

Verdict

The call

The clearest difference is in-app purchases: PosidoniaMaps at none against DONIA's 2. PosidoniaMaps also leads on review sentiment (80% vs 59%). DONIA's advantage is update cadence (fortnightly vs every 5 months) and iOS requirement (11.0 vs 14.5). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

DONIA ships an update fortnightly, PosidoniaMaps every 5 months. The most recent releases landed on September 22, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
DONIA versus PosidoniaMaps: the parameters behind the verdict, then further details
ParameterDONIAPosidoniaMaps
PriceFreeFree
Rating4.5 (31 ratings) — better—
Positive reviews59.3% of reviews80.0% of reviews — better
Number of ratings31 — better—
Update frequencyFortnightly — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better14.5
Further details — not scored
Size61 MB68 MB
Age rating4+4+
DeveloperAndromede OceanologieMovired 2000 S.L.

Customer experience

DONIA

All ratings31 ratings
Positive87.1%
Neutral0.0%
Negative12.9%
Written reviews27 reviews
Positive59.3%
Neutral22.2%
Negative18.5%

PosidoniaMaps

Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

2 purchases

DONIA

Subscriptions2
  • DONIA® Premium Monthly7 Days trial$2.491 Month
  • DONIA® Premium Version7 Days trial$22.991 Year
None

PosidoniaMaps

No in-app purchases

Questions

Is DONIA free?
DONIA is free to download, with in-app purchases available.
Is PosidoniaMaps free?
PosidoniaMaps is free to download, with no in-app purchases.
Do DONIA or PosidoniaMaps have ads?
Neither DONIA nor PosidoniaMaps shows ads.
Which is updated more often, DONIA or PosidoniaMaps?
DONIA ships an update fortnightly, and PosidoniaMaps every 5 months. Most recently, DONIA was updated on September 22, 2026 and PosidoniaMaps on June 1, 2026.

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