Sea Window vs PredictWind, Savvy Navvy and Windy

At a glance

A side by side view of what each app is built around, for a skipper planning coastal trips of a few hours to a couple of days.

Feature	Sea Window	PredictWind	Savvy Navvy	Windy
Built around	Marine weather and trip timing	Offshore weather routing and passage planning	Charts and navigation, with routing	A global weather map
Suits best	Coastal trips of four hours to two days, sail or power	Ocean crossings and long offshore passages	Sailors who want charts, routes and tides in one app	Anyone who likes to browse every model and layer
When to leave	A departure every 30 minutes over 72 hours, ranked against your own limits, with the reason in plain words	A departure planner, and an AI Weather Router that compares departure options	A departure scheduler	A Passage Planner plugin that checks several departure times
Weather along the route	Wind, gusts, seas, visibility and current at every waypoint, for the hour you'll be there	Weather routing that works out a route around the weather	Routes that take weather and tides into account	Weather along a planned passage through the plugin
Platforms	iPhone and iPad	iPhone, Android and desktop	iPhone, Android and web	iPhone, Android and web

What Sea Window does differently

A departure decision, explained, for the trip you're actually taking

Sea Window is weather first, and built for the coastal hop: long enough for the weather to change on the way, short enough that the right departure hour makes the trip. It answers one question well. When should I leave, and why?

See the Departure Advisor

Your limitsEvery departure is checked against the wind, gusts, seas and visibility you're happy with, scaled to your boat.
CurrentsNOAA current predictions near your route in US waters and ocean-model currents elsewhere, with wind against current called out.
ModelsA badge for each day says whether GFS, ICON and ECMWF agree, so you don't have to compare them by hand.
Plain words"Leave Sat 07:00", the one condition that limits it, and what changes if you leave later.
Every waypointWind, seas, visibility and current at the hour you'll reach each point.
Official dataNWS marine warnings with optional push alerts, zone forecasts, NOAA tides and currents, and live buoys.

Which app fits your trip

There is no single best marine weather app for everyone. There is a best fit for the trips you make.

Choose Sea Window if

you cruise the coast under sail or power, on trips of a few hours to two days, and you want the best time to leave ranked against your own limits, with the weather at every waypoint for the hour you'll be there.

Choose PredictWind if

you are planning ocean crossings or long offshore passages and want weather routing that works out the route itself, with GRIB files and boat polars.

Choose Savvy Navvy if

you want charts, routing, tides and weather together in one navigation app.

Choose Windy if

you enjoy reading the weather yourself across many models and layers on a big global map.

Choose Buoyweather if

you fish offshore and want point marine forecasts for the spots you run to.

Using them together

Where Sea Window fits in your kit

Plenty of skippers keep a chart app for navigation and a weather map for the big picture. Sea Window sits between them and makes the call: which hour to leave, and what you'll meet on each leg.

The week beforeWatch the 7-day forecast and the model agreement badge for the days you could go.
Two days outRun the Departure Advisor on your route and see which windows hold.
The night beforeRe-check the best window, the limiting condition and any warnings in force.
On the waterRoute weather, tides and the last forecast stay on the phone for 24 hours with no signal.

Comparison questions

What is the best marine weather app for coastal cruising?

For coastal trips of four hours to two days, pick an app that times the forecast to your route and ranks departure times. Sea Window is built for exactly that, sail or power, with your own comfort limits, tidal currents and model agreement in the ranking.

Is Sea Window a PredictWind alternative?

For coastal passages, yes. Both help you choose when to leave. PredictWind is built around offshore weather routing for ocean passages. Sea Window is built around the coastal hop: departure times ranked against your limits and currents, with the weather at every waypoint for the hour you'll be there.

Is Sea Window a Savvy Navvy alternative?

They pair well. Savvy Navvy is a navigation app with charts and routing. Sea Window is a weather app that ranks departure times and shows conditions along your route, so many skippers use a chart app to navigate and Sea Window to choose when to go.

How is Sea Window different from Windy for boating?

Windy is a global weather map for exploring every model and layer. Sea Window has a conditions map too, and adds the boating decision on top: your route, your speed and your limits, turned into a ranked list of departure times and a forecast for every waypoint.

Can I use Sea Window alongside a chart app?

Yes. Pick your departure and check the weather on each leg in Sea Window, and keep your chart app open alongside it on passage.

Does Sea Window work for powerboats and trawlers?

Yes. Comfort limits start from your boat type and length, and a steady cruising speed makes the arrival time at each waypoint especially accurate.

Guides for choosing your moment

Passage planning

Sea Window, PredictWind, Savvy Navvy and Windy