OpenSeaMap vs Wattpaddler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenSeaMap
This app provides a free, worldwide nautical chart with detailed sea information, including lights, weather data, and harbor details. It offers chartplotting, waypoint management, and offline map caching for navigation. Users can mark locations, enter coordinates, and adjust chart zoom for optimal viewing.
- Free worldwide sea chart
- Chartplotting with tracking
- Waypoint creation and export
- Offline map caching
- Mark and search locations
- Adjustable chart zoom
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OpenSeaMap is a worldwide Opensource-project for creating a free nautical chart. Founded in 2009 the project gained a lot of attention lately adding more and more nautical information for free. Not even lights and other nautical infos are provided, but also more and more info layers like weather data, information about harbours and so on. As an add on to the OpenStreetMap this provides all missing info for nautical activities. OpenSeaMap is part of OpenStreetMap and uses the same database. FEATURES: - Free worldwide sea chart (incl. HD chart graphics) - Search for geolocations worldwide - Chartplotting with continuous tracking - Waypoints can easily be created, edited, deleted & exported - Mark locations in the chart - Zoom chart optically to fit your preferred reading size - Enter coordinates directly to be displayed in the chart - Offline caching of up to 1 million map tiles - Cleanup of chart cache data at any time To ensure future development and support of the OpenSeaMap app we encourage you to buy the In-App-Product "PRO". This will help keeping new updates and features coming. DISCLAIMER: OpenSeaMap is part of the OpenStreetMap and uses the same database. As an experienced navigator you should NEVER rely your descisions on one source of information alone. Please keep in mind that the OpenSeaMap can not replace official sea charts on bord of your boat. Please use the OpenSeaMap app only in conjunction with official sea charts and conforming to national and international regulations. Please recognize that no depth information is provided by this product. IMPORTANT: The continued use of the GPS can significantly decrease the battery level.
Wattpaddler
Provides tide and water level forecasts for German, Dutch, and Danish coastal areas. Includes detailed weather predictions, storm warnings, and nautical information for safe navigation. Offers tools for calculating passage times and visualizing tidal data.
- Tide and water level forecasts
- Weather predictions and storm warnings
- Nautical warnings and information
- Passage time calculation
- Tidal data visualization
- Daylight and moon phase information
- Interactive nautical charts
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Anzeige der Gezeiten für alle deutschen Bezugs- und Anschlussorte sowie niederländische und dänische Gezeitenorte. Für das aktuelle Jahr und jeweils ab Herbst auch für das kommende Jahr werden amtliche deutsche, niederländische und dänische Gezeiten angezeigt. Für Deutschland Integration der 5-Tage Wasserstandsvorhersage des BSH, des DWD Küstenseewetterberichtes sowie von amtlichen Sturm- und Starkwindwarnungen für die ausgewählte Region. Ortsgenaue Wettervorhersagen des DWD und von Yr.no. Warnung vor mittlerer (orange Welle) und hoher (rote Welle) Dünung. Nautische Warnnachrichten des BSH sind ebenfalls integriert, bei einer neuen Meldung weist die App darauf hin. Daneben können Seekajakfahrer und Segler mit Wattpaddler Zeitfenster für die Passage eines Flachs im deutschen Wattenmeer nach der „Regel der Zwölftel“ berechnen. Dabei werden Spring- und Nipptiden sowie die Wasserstandsvorhersagen der nächsten 5 Tage berücksichtigt. Visualisierung des aktuellen Wasserstandes durch eine Sinuskurve. Ein Standard-Ort kann zur sofortigen Anzeige gespeichert werden. Für Nachtfahrten wird die Länge der bürgerlichen und nautischen Dämmerung, die tagesaktuelle Mondphase sowie Mondauf- und untergangszeiten angezeigt. Deutliche Anzeige der für Wassersportler wichtigen Elemente der Nordsee-Befahrensverordnung auf einer voll funktionalen, genauen Seekarte auf Basis von BSH-Daten. Tage, die bestimmten Tiden Bedingungen entsprechen, können gezielt gesucht werden, etwa: „Abendhochwasser an einem Sonntag im Juni“. Unterstrichene Wörter verlinken weitere Funktionen, die durch Tap aktiviert werden. Änderungshistorie siehe Webseite wattpaddler.de.
Screenshots
Verdict
The clearest difference is review sentiment: Wattpaddler at 91% against OpenSeaMap's 38%. Wattpaddler also leads on in-app purchases (none vs 1) and iOS requirement (15.0 vs 18.6). On price, update cadence, 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
Both are free to download. OpenSeaMap sells 1 one-off in-app purchase. Wattpaddler asks for nothing beyond the download.
OpenSeaMap ships an update every 2 months, Wattpaddler every 4 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | OpenSeaMap | Wattpaddler |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 38.3% of reviews | 91.2% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | appdoctors UG | Steffen Wagner |
Customer experience
OpenSeaMap
Wattpaddler
In-app purchases
OpenSeaMap
- OpenSeaMap Professional$1.99
Wattpaddler
No in-app purchases
Questions
Is OpenSeaMap free?
Is Wattpaddler free?
Do OpenSeaMap or Wattpaddler have ads?
Which is updated more often, OpenSeaMap or Wattpaddler?
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