Bosun's Mate
The captain's logbook & network

Your boat.
Your crew.
Every harbour you've shared.

Engine hours, fuel, maintenance, and the cruising log — plus the address book of every boat you've crossed paths with. The logbook that remembers people too.

No credit card to start · Cancel anytime · Lifetime option available
Bosun's Mate dashboard showing engine hours, YTD costs, fuel, and maintenance for Northern Belle
No credit card
End-to-end encrypted
Web · iOS · Android
Built by a captain
⚓ New · Cruiser Contacts

You recognize boats better than people.

Every cruiser knows the feeling — five years later you remember the green-trim sailboat in Princess Louisa, but not the couple's names. Bosun's Mate keeps that memory for you, with the people, pets, and the anchorage you shared.

🚢

Boat-first address book

Log the hull colour and trim before the names. Add the crew, pets, even socials — phone, WhatsApp, Instagram, Facebook — all in one card.

📍

Pin the encounter

Save the day to your Cruising Log with one tap of your location. Bosun's Mate reverse-geocodes the coordinates to the place name: Princess Louisa, BC.

The captain's network

When the other boat is also on Bosun's Mate, their public profile attaches automatically. Photo, bio, hailing port — pulled in for you.

No credit card · Free forever plan + 7-day Pro trial · Web, iOS & Android

2-minute tour

See it run on a real boat.

What's new in v1.4

Fresh from the shipyard.

Two features every captain has been asking for — shipped this month.

New

Pin your anchorage — with the place name attached.

Tap once on the map, or use your device's location — Bosun's Mate reverse-geocodes it into a real place name (Princess Louisa, BC · Roche Harbor, WA · Wrangell, AK). Every Cruising Log entry and every Cruiser Contact keeps the moment and the where together, so five years from now you'll still know exactly which cove that was.

Now live

Native iOS + Android apps.

Face ID / Touch ID / Fingerprint sign-in, a real home-screen icon, offline-capable logging, and camera-native receipt capture. Web still works everywhere — every plan syncs across all three.

How it works

Three minutes to set up. Years of peace of mind.

01

Add your vessel

Pick a preset (powerboat, sailboat, fishing) or start blank. Add engine, transmission, electronics — all in one tidy registry.

02

Log as you go

Snap a receipt with your camera. Note an engine hour. File a fuel fill-up. Every entry is filed under your vessel automatically.

03

Stay ahead

Maintenance due dates by hour or date. YTD costs by category. Overdue alerts. Your boat's whole story, in your pocket.

See it in action

Five taps to log a fuel fill. Three to file a receipt.

Dashboard — Engine hours, YTD costs, upcoming service — at a glance.
Dashboard
Engine hours, YTD costs, upcoming service — at a glance.
Cruising Log — Departure → return, hours underway, distance in nautical miles.
Cruising Log
Departure → return, hours underway, distance in nautical miles.
Activity feed — A git-log for your boat — every entry, chronologically.
Activity feed
A git-log for your boat — every entry, chronologically.
Maintenance — Photo-attached entries, due dates by hour or date.
Maintenance
Photo-attached entries, due dates by hour or date.
Fuel log — Litres or gallons, cost per fill, engine hours at fill.
Fuel log
Litres or gallons, cost per fill, engine hours at fill.
Swipe horizontally to see more →
Features

Everything a captain logs by hand — done in seconds.

Maintenance schedules

By hours, dates, or seasons. Knows what's overdue.

Fuel & engine hours

Trend lines, MPG, range — quiet bookkeeping for noisy engines.

Cruising Log

Departure → return, hours underway, distance in nm, anchorages and photos. Your seasons, captured.

AI receipt OCR

Snap a receipt — AI fills in vendor, total, date. Multi-photo per entry.

Share with crew — free

Invite your partner, mechanic, or co-captain. Unlimited crew, no extra cost.

Activity feed

A git-log for your boat — see who logged what, when, across every category.

Multi-vessel ready

One captain, several boats. They each have their own log.

Survey & insurance

Renewal dates that don't sneak up on you.

Web + mobile sync

Add a fuel fill-up on the dock, read on the couch.

Custom fields & categories

Make it yours — track hours, PSI, anything that matters to your boat.

Multi-currency

Log costs in USD, CAD, EUR, GBP and 3 more. Your call on the display total.

Built for every vessel

Cruisers, sailboats, charters — same captain's log.

Pick a preset, get sensible defaults, then customize categories and fields to suit your vessel.

Northern Belle · Alaska
Powerboat / Houseboat
Rigging · Sails · Trips
Sailboat
Crew · Fuel · Surveys
Charter / Yacht
From the helm

What captains are saying.

Early feedback from beta captains across North America. Want to add yours? Tell us your story.

"I finally stopped keeping fuel receipts in the chart drawer. My mechanic asked for a service history last spring and I just hit Export PDF."
Beta Captain · 38' Trawler
Vancouver Island, BC
"Cruising Log is genuinely the feature I didn't know I needed. Hours, distance, average speed — all logged with the trip. Better than my paper notebook ever was."
Beta Captain · 44' Sailboat
Annapolis, MD
"Shared access with my wife means she stops hunting for parts numbers when I'm down below. Co-Captain access for free was the dealbreaker for me."
Beta Captain · 32' Centre Console
Lake Champlain, NY
Captain-friendly pricing

Free forever. Go Pro when your boat demands more.

Free
$0forever
  • 1 vessel, unlimited entries
  • Maintenance, fuel, costs & cruising log
  • Photos & receipts on any entry
  • 7-day Pro trial included at signup
  • Web + iPhone + Android
Monthly
$4.99USD / month
  • Unlimited vessels & co-captains
  • AI receipt scan & survey import
  • Charts & fuel-economy analytics
  • Checklists, custom fields, SMS alerts
  • Cancel anytime
Best value
Annual
$49.99USD / year
  • Everything in Monthly
  • Save ~17% ($59.88 → $49.99)
  • Priority support
  • Annual maintenance export
  • Cancel anytime
Lifetime
$150USD · one-time
  • Everything in Annual — forever
  • All future features included
  • Founder badge on your profile
  • Never pay again
  • Only 150 seats, ever
Multi-currency support (USD, CAD, EUR, GBP, AUD, NZD, MXN) · No credit card to start
Now on iOS + Android

Use it on the dock, the helm, or the couch.

Bosun's Mate is now live on the App Store and Google Play — free plan, no card required. Or keep using it in your browser; every plan works across all three.

Download on the
App Store
Get it on
Google Play
Prefer the web? Open Bosun's Mate in your phone's browser — it installs in one tap.
Frequently asked

Questions, answered.

Ready to run your boat like a captain?

Free forever. No credit card. Founder lifetime available — but only 150 seats, ever.