RHUMBLINEAPPS
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An AI-first software company

Apps for a
brighter journey.

Rhumb Line Apps builds careful, offline-ready apps for people on the water.

Meet ICW Planner What we hold to
ICW Planner for iPhone & iPadIn final testing ICW Planner for AndroidIn development
168bridges on the chart, Norfolk to Miami
76opening schedules, timed to your arrival
231mile markers on the chart
0ads or trackers in our apps

Our apps

Tools that hold their heading.

Focused apps that keep working when you're out of cell range, because that's where boaters need them most.

ICW Planner app icon

ICW Planner

Bridge-by-bridge trip planning for the ICW

Plan a day on the Atlantic Intracoastal Waterway on NOAA charts: bridge opening times, speed optimization, tides, currents, clearances, and the history of the places you pass — Norfolk to Miami and the Keys gateway.

iPhone & iPad · iOS 17+ Android in development Free, with optional Pro Works offline
Explore ICW Planner See pricing

AudibleTour Coming soon

Narrated tours that play the right story at the right place. audibletour.com

More in the yard In the works

We're a young company with a full slip of ideas for cruisers. New apps will show up here as they launch.

What we hold to

Built for the water, not for clicks.

Four promises behind every app we make.

Safety before cleverness

Planning aids, never a substitute for the official chart and your own judgment, and our apps say so plainly.

Works with no signal

Bridges, schedules, tide stations and the math live on your phone, so the plan still comes out when you are out of cell range.

Official sources

NOAA charts, tides and currents, Coast Guard notices and published bridge schedules: sourced, dated and checked.

Private by default

No ads and no tracking. Your position is worked out on your phone and is never sent to us, unless you choose to send in a mark.

Our name

What "rhumb line" means

A rhumb line is the navigator's steady course — a path that holds a constant bearing across every meridian. It isn't always the shortest line on the globe, but it's the one you can actually steer. That's our philosophy for software, too: dependable tools that hold their heading, do one job well, and keep working when the signal drops.

Apps for a brighter journey.

Get in touch

Fair winds. Let's talk.

Questions about an app, a bridge we got wrong, or an idea for the next one? Write to us — we read every message.

support@rhumblineapps.com Support and FAQ