Anchoring
Know your swing. Trust your ground tackle.
At 0200 the wind clocks 40°. Anchoring tells you whether your rode has the room before the alarm does.
Live on the App StoreLearn more →
Rainbow's End Marine, LLC
Apps for sailors,
by sailors.
Honest tools for the sea.
You and your crew are enjoying dinner ashore. The weather takes a nasty turn. Your Monitor tells you your boat is tugging at her anchor, but she's safe — for now. Nighttime at the dinghy dock, and you need to get to her quickly. You have a bearing, an arrow pointing directly at your boat, with the distance displayed.
Rainbow's End Marine builds the tools that answer the questions you actually ask at sea — offline, private, and honest about what they know.
Why we stand out
Different by design. Honest by doctrine.
No account. No cloud. No tracking.
Every app works entirely offline. Your position, your plans, your data — none of it leaves your device. A sailor's privacy is respected here.
Built from the boat, not a boardroom.
These tools were written at anchor, at sea, and on passage. Every screen answers a question a real skipper actually asked.
What the app won't do is a feature.
We don't automate judgment. We give you the information you need to make your own decisions -- nothing more. The skipper decides — always.
Estimates say so.
We explain how numbers are calculated. When a number is an estimate, we say so. Honest labels keep you honest at sea.
The fleet
Nine apps. One purpose.
Monitor
Watch your boat. Find your way back.
The boat shares the watch under an eight-character code. Anyone who types it sees the same fence, hears the same alarm — no account, no Apple ID in common. One arrow points at your boat from the dinghy dock.
Free companion to Anchoring · Coming soonLearn more →Manifest
Everything about your boat in one place
The flare kit is in the starboard cockpit locker, second shelf, port side. You'll know that at midnight in a seaway.
Live on the App StoreLearn more →Float Plan
Leave a plan. Come home to it.
Your shore contact gets a clean, complete float plan — departure, route, souls aboard, expected arrival — before you cast off.
Live on the App StoreLearn more →Provisioning
Provision for the passage. Grocery list included.
Meals, days, crew count — the list builds itself. You walk the dock with exactly what you need.
Live on the App StoreLearn more →Arc
A camera sextant, for the fun of it.
Photograph the sun and the sea horizon in one frame. The picture and the clock do the rest — a line of position in seconds, a fix from two sights, a deck log that keeps honest dead reckoning between them.
Live on the App StoreLearn more →Logbook
Every watch, every passage, written down.
Position, course, speed, weather, remarks — a proper ship's log that lives on your device and never needs a signal.
Coming soonLearn more →Ship's Purse
Every shared expense, settled honestly.
Fuel, provisions, marina fees — the skipper logs it, the app tallies it, and everyone knows the settlement before the dock lines are off.
Coming soonLearn more →Ship's Guest
See the purse. Know your share.
Crew can follow the expense pool in real time — contributions, costs, and what may come back to them at the end of the voyage.
Free companion to Ship's Purse · Coming soonLearn more →Each app is an aid to judgment, not a substitute for the skipper's.
Current status
Five apps live on the App Store.
More on the way.
Anchoring, Manifest, Provisioning, Float Plan, and Arc are live on the App Store for iPhone and iPad. Monitor, Logbook, Ship's Purse, and Ship's Guest are in review or coming soon. Google Play is on the horizon.
Join the beta