Crab is the ultimate iOS app for marine weather and tide forecast. It empowers your seaside days with very precise forecasts and tide times.

The interface is fully optimized for a great user experience featuring precious data like:
- times of the next high and low tides
- tides coefficients
- air and water temperature
- sea height
- direction and speed of the wind
- swell speed, direction and height!

You can follow the evolution of the weather in real time thanks to the interactive graph that lets you pan and show precisely the weather for the next 30 hours! Whether for seaside holidays, for surfing, for sailing or if you have professional needs, Crab will answer all your marine weather requests!

They talk about us :

Le Monde :

Maddyness :

Apphone :


What's New

Version 1.1

New Units!
Touch any data and change the unit immediately! It works with all data displayed in the app (distance, directions, speeds, heights...)

Force Touch integration
The Apple Watch app has been updated with a new Force Touch integration that enables you to add and delete cities right from the watch! You can also change the default city displayed in the Glance.

Bug fixed
Bugs fixed on the Apple Watch that did miss some informations. This is now history!
Bugs fixed on the interactive graph too!
Design and performance improvements

Ratings and Reviews

Clean interface but colors need to change

Pit Chihuahua

The layout of information is great. The only problem is if you're outside in the sun, it's near impossible to read a white on a gray or sky blue background. They either need to pick better contrasting colors or let the user custom define their own colors to suit their needs. Maybe even have multiple profiles for Sunny, cloudy, nighttime light exposure.

Not bad but needs a little work


Good app that provides information I need. The colors need to be changed so it's easier to see in a variety of weather conditions. Also would like to see wave height changeable to metric.
Other than that it's great.

Favorite Go-to Marine Weather App


Compared to some of the other clunky marine weather apps out there, this is a refreshingly simple and well designed app. It give me key info and tides in a glance.


16.3 MB
Requires iOS 8.2 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, Hindi, Portuguese, Simplified Chinese, Spanish
Age Rating
Rated 4+
© 2015 Lamarckise
In-App Purchases
  1. Buy a Crab! $2.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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