Comparison

Open Sea OpenSeaMap Browser vs WWF Nautical Chart

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

Head to head
About

Open Sea OpenSeaMap Browser

This app provides access to nautical chart data and map image tiles generated by a collaborative open-source mapping project. It serves as a browser for freely usable marine navigation information.

Highlights
  • Nautical chart data access
  • Map image tile generation
  • Open-source mapping project browser
  • Freely usable marine navigation info
Features
Read full description

Open Sea is a browser for the maps produced by the OpenSeaMap project. OpenSeaMap is a subproject of OpenStreetMap, and generates freely usable nautical chart data and map image tiles.

About

WWF Nautical Chart

This app helps users navigate Wismar Bay and the Bay of Greifswald, highlighting sensitive areas and boating rules within Natura 2000 zones. It provides information on protected areas, fishing regulations, and bird species to promote harmonious coexistence between people and nature.

Highlights
  • Pinpoint location in Wismar Bay and Greifswald Bay
  • Shows sensitive areas and boating rules
  • Identifies protected Natura 2000 areas
  • Provides information on nature and regulations
  • Includes fishing and bird information
  • Routing function with waypoints
Features
Read full description

The app can be used to pinpoint your location in Wismar Bay and the Bay of Greifswald It also shows the particularly sensitive areas and boating rules in the voluntary agreements within the Natura 2000 areas. Users, e.g. people who are fishing, sailing, motor boating, kite-surfing, rowing, kayaking or canoeing, can see on their smartphone or tablet at any time whether they are inside or outside protected areas. It is no longer a valid excuse to say you don’t know where you are! The app is designed to help you comply with the BOATING RULES. Improved navigation on the water will reduce disturbances in the protected bays and in the breeding and resting areas of waterbirds. It is intended to help ensure that people and nature can co-exist in harmony in the species-rich coastal waters. Interesting information about NATURE is provided for individual areas and the legal regulations are also available for anyone who wants to know more. HOW THE APP WORKS Navigate through the Wismar Bay and the Bay of Greifswald using the routing function. Waypoints make it easy for you to avoid the protected areas. Click on the red and orange zoning or colour-coded protected areas to learn more about nature and special regulations. The “Nature” section contains a glossary with explanations of protected areas, regulations and institutions. In the “Fish” section you can find useful information about fishing, including a description of individual fish, fishing seasons, minimum sizes, periods closed to fishing and the Red List status of the individual species. The “Bird” section features common birds with photos and audio. Detailed maps can be downloaded under “Info” and then “Nautical charts”. FEATURES: - Waypoints can be set with the routing function. The distance and course of the selected route are automatically displayed. - Orange and red areas indicate when boating is permitted in the area or not. - If the boat crosses the boundary of a restricted protected area, a message automatically appears on the map. - Coloured areas provide information about the protected areas (including nature conservation areas and fish sanctuaries). - Minimum sizes and seasons closed for fishing: during the season when fishing is not permitted for a species, a crossed-out fishhook appears next to the fish. - Winter sanctuaries, fish and spawning sanctuaries are only shown on the map during the period closed for fishing. - Use the layer icon to show and hide the areas for boating and fishing. Have a great day out on the water! Enjoy your visit and please respect nature!

Screenshots

Open Sea OpenSeaMap Browser2 screens
WWF Nautical Chart4 screens

Verdict

The call

The clearest difference is review sentiment: WWF Nautical Chart at 100% against Open Sea OpenSeaMap Browser's 29%. WWF Nautical Chart also leads on update cadence (every 6 months vs every 102 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Open Sea OpenSeaMap Browser ships an update every 102 months, WWF Nautical Chart every 6 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard2 real differences · 8 level
Open Sea OpenSeaMap Browser versus WWF Nautical Chart: the parameters behind the verdict, then further details
ParameterOpen Sea OpenSeaMap BrowserWWF Nautical Chart
PriceFreeFree
Rating3.2 (5 ratings) — better—
Positive reviews28.6% of reviews100.0% of reviews — better
Number of ratings5 — better—
Update frequencyEvery 102 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.514.0 — better
Further details — not scored
Size1 MB263 MB
Age rating4+4+
DeveloperMobile GeographicsWWF Deutschland

Customer experience

Open Sea OpenSeaMap Browser

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews7 reviews
Positive28.6%
Neutral28.6%
Negative42.9%

WWF Nautical Chart

Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Open Sea OpenSeaMap Browser

No in-app purchases

None

WWF Nautical Chart

No in-app purchases

Questions

Is Open Sea OpenSeaMap Browser free?
Open Sea OpenSeaMap Browser is free to download, with no in-app purchases.
Is WWF Nautical Chart free?
WWF Nautical Chart is free to download, with no in-app purchases.
Do Open Sea OpenSeaMap Browser or WWF Nautical Chart have ads?
Neither Open Sea OpenSeaMap Browser nor WWF Nautical Chart shows ads.
Which is updated more often, Open Sea OpenSeaMap Browser or WWF Nautical Chart?
Open Sea OpenSeaMap Browser ships an update every 102 months, and WWF Nautical Chart every 6 months. Most recently, Open Sea OpenSeaMap Browser was updated on November 1, 2026 and WWF Nautical Chart on November 3, 2026.

Other comparisons