LuckGrib 4+

#1 for sailors and enthusiasts

Craig McPheeters

    • 4.9 • 243 Ratings
    • Free
    • Offers In-App Purchases



LuckGrib is a fully featured, easy to use, fast GRIB reader, viewer, downloader and weather router. Remote access to weather data via satellite or email is supported. Advanced weather routing capabilities, for sailors, is available.

Weather forecast data, packaged as GRIB files, can be downloaded directly from the LuckGrib server cluster.

For offshore sailors, LuckGrib offers a best-in-class, complete solution: industry leading visualization and ease of use, highly optimized weather data downloads via satellite, along with industry leading optimized weather routing and route analysis. Inshore sailors may not require satellite downloads, but will benefit from the rest of the system.

LuckGrib is unique among apps that were originally designed for sailors, in that the weather analysis tools are powerful enough to attract attention from meteorologitsts.

For meteorologists, and weather enthusiasts, LuckGrib offers access to a wide range of high resolutions models, a number of global models, weather data at the surface, 850mb, 500mb and 250mb levels, parameters ranging from simple things such as wind, pressure and temperature, to more advanced quantities such as simulated radar, standard deviations, precipitable water, lightning, vertical vorticity, helicity and more. Access is available to the entire suite of parameters in GFS, HRRR, NAM and others.

Downloads are available via: a direct high speed internet connection, through the Iridium GO! as well as through the RedPort Optimizer.

LuckGrib provides access to many weather and ocean models, including: GFS, GFS Wave, GDPS/GEM, GEFS, HRRR, RAP, NAM, NBM, Icon-EU, Arpège, Arome, OpenWRF, RTOFS, NCOM and many others. These models allow you to study surface conditions, wave and swell state, ocean currents, winds at the jet stream level, mid atmosphere as well as at the boundary layer. In addition, LuckGrib allows you to explore weather model uncertainty with its support for standard deviation and probability values. LuckGrib is a thoroughly modern and advanced GRIB viewer.

See: for more details on the models and parameters that are available.

LuckGrib comes with a 14 day free trial. If you are interested in studying weather and gaining access to detailed weather forecasts, download the app and give it a try.

Downloading data via satellite or email requires the Offshore Data in-app purchase. See for more details on the remote access capabilities.

The LuckGrib weather routing system is an industry leading, high quality, robust, high performance and comprehensive system. See for more details. Access to the isochronal weather routing system requires an in-app purchase.

The LuckGrib isochronal Weather Routing solver is able to respect intermediate constraint points, the first in the industry. A constraint point is a point which a route must leave to port or starboard. Constraint points are needed to describe short routes which have crossings, as well as to express your preference on a long open ocean passage to stay to a given side of a strategic point. A simple example of a short route that needs this ability is a route which goes around an island, returning to the start point. Many sailboat race routes, perhaps the majority, have routes which cross. Two examples are Fastnet and the Around Catalina Island race. These routes can now be described in LuckGrib, and optimized Weather Routing solutions found for them.

Note that LuckGrib does not use a subscription pricing model - after the free trial, when you decide to purchase the app, there will be a one time charge, not an ongoing subscription.

For more details, please visit the support website.

* privacy policy:
* terms of use:
* end user license agreement:

What’s New

Version 2.4.3

This is a small update with various small and subtle changes sprinkled around the app.  

One notable addition, mainly for sailors in the USA, is the addition of support for OFS tide height data. The OFS models are high resolution regional models around the USA, which include ocean current and tide height information. There is OFS data for a variety of regions around the USA, including the Salish Sea (including Puget Sound, the San Juans and around Vancouver Island), San Francisco Bay, Tampa, Delaware, and more.

Ratings and Reviews

4.9 out of 5
243 Ratings

243 Ratings

Nicknamethe3rd ,

Worth Every Penny

The layout, tutorials...everything is so intelligent and user friendly. For beginners, it’s almost like taking a basic meteorology course. More thought was put into this than any other app I’ve ever used.
I’ve used some free grib software and tried other 3rd party analysts online, and this is the best thing I’ve found. People actually use this for crossing oceans. Just get a meridian transmitter and an iPhone. 20$ is way better than spending 2000$ on one of those hardcore systems you have climb the mast to install. Sure there’s no substitute for onboard weather radar but that gear is $$$.
I live very close to a NOAA building, and actually went in to get someone to show me how to use their website, and I still couldn’t figure it out. They DO NOT have an app. Don’t be fooled. Nor do they have a mobile website.
As far as accurate data is concerned grib files are where it’s at, and this is simply the best mobile option.
People go out on the ocean all the time without being smart and checking the weather. They leave at the crack of dawn when it’s not blowing. By late afternoon they’re 20 miles out, caught in a gale, calling for help. In the age of the smartphone there’s no excuse. This app saves lives.

Developer Response ,

Thank you!

joshellis625 ,

Absolutely Brilliant!

I’ve been a huge weather nerd for many years and the fact that I’ve only just discovered this app a month ago is blowing my mind. I had every way to track the weather and even knew about forecast models. I kept saying there has got to be a better way to view forecast models, especially on my iPhone and iPad. Well sure enough I finally came across this app mentioned after seeing it mentioned on Reddit and I discovered the wonderful world of GRIB files and easily accessible weather models. I immediately started using the app and could not put it down. I proceeded to learn everything I could about GRIB files and LuckGrib. This is a game changer. Fantastic UI/UX by a very thoughtful developer. Has everything I was looking for. Even though this is a niche product I hope to see it maintained for as long as possible. If you love studying the weather then you will be glad you found LuckGrib!

Developer Response ,


jalmberg ,

Long time user

I’ve been using LuckGrib since it’s early days and it is remarkable to see how it has developed into what I think is the best weather solution for boaters available for iOS. The developer is very responsive to feedback. I don’t know how he would respond to bugs and problems because I haven’t seen any of those, yet. I’m guessing pretty good! I’ve used the weather routing features on several long passages, and it has changed the way I think about weather windows for the better. The app’s integration with Iridium Go is second to none. The number of available models is likewise outstanding. Finally, as an iOS developer myself, I have to take my hat off to the app’s user interface which is elegant and intuitive in the way that all apps should be, but often are not. Highly recommended.

Developer Response ,

Thank you!

App Privacy

The developer, Craig McPheeters, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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