N S W E
Bosun BOSUN
AI-powered boat maintenance

Your boat's
first mate
never sleeps.

Upload your manuals. Bosun reads every page, extracts every service interval, and builds a precise maintenance schedule — so nothing gets missed.

Download on the App Store See how it works
PDFUpload your manuals
9:41
Today
Sailor Moon
Needs your attention 1
Engines · Port & Stbd
Adjust alternator V-ribbed belt tension
Overdue
Every 250 hours or 1 year, whichever comes first.
SNOOZE
VIEW TASK →
Needs review 3
Engines · Port & Stbd
Adjust valve clearance
New 530 / 50 hrs
Engines · Port & Stbd
Propeller shaft alignment
New 530 / 50 hrs
Fuel · Port & Stbd
Bleed air from fuel system
New 530 hrs
Today
Schedule
Logbook
Manuals
Fleet
The problem

Boats break when
maintenance slips.

Most boat owners are diligent — but tracking a dozen systems, each with different intervals buried across different manuals, is a full-time job. Something always falls through the cracks.

How it works

From cold start to a
full maintenance plan
in minutes.

01

Upload your manuals

Drop in your engine, electrical, and systems PDFs. Bosun accepts any format — Yanmar, Volvo, Westerbeke, Garmin, you name it.

02

Bosun reads every page

Our AI scans every page and extracts every service interval, torque spec, and part number — each task pinned to the exact page it came from.

03

Get your live schedule

A complete maintenance board with alerts, sparklines, cost estimates, and parts lists — organized so nothing slips.

Bosun reading · Yanmar 4JH45 Service Manual
Extracted maintenance tasks
Engine Oil & Filter Change
Every 100 hrs or 1 year · p. 42 · $85 est.
Raw Water Impeller
Every 200 hrs or 2 years · p. 67 · $45 est.
Fuel Filter Replacement
Every 200 hrs · p. 78 · $32 est.
Valve Clearance Check
Every 1,000 hrs · p. 112 · $0 est.
Features

Everything a serious
boat owner needs.

Bosun isn't a generic task list. Every feature is built around how boats actually work.

AI Manual Reading

Every task traced to the exact page in your manual. No guessing — precise extraction from your actual documents.

Yanmar 4JH45p. 42–67
Victron MPPTp. 18–24
Garmin VHFreading…

Alerts That Matter

Overdue jobs surface immediately. Each alert shows the system, how overdue it is, and a one-tap action to start or snooze.

Hours & Cycles Tracking

Log engine hours, generator cycles, and pump run-counts. Bosun calculates exactly when each service interval is due.

Sparklines & Trends

Each system card shows a mini trend of recent service history so you can spot a system getting more attention than usual.

Full Maintenance Schedule

Chronological view grouped by week, urgency, or system. Filter by upcoming, overdue, or completed. Export to PDF.

Parts Lists & Cost Estimates

Every task comes with a parts list and cost estimate from your manual — budget and order before you're in the yard.

Reviews

Trusted by
serious sailors.

★★★★★

"I uploaded my Yanmar manual and within two minutes Bosun had pulled out 23 maintenance tasks I didn't even know existed. It's embarrassing how much I was missing."

MC
Marcus C.
SV Blue Compass · Beneteau 45
★★★★★

"Finally an app that understands boats. Not generic tasks — actual intervals from my actual manuals. The parts cost estimates alone saved me hours before our refit."

SL
Sarah L.
MV Resolute · Nordhavn 40
★★★★★

"We avoided a mid-passage engine failure because Bosun alerted us to an overdue impeller. It's not hyperbole to say this app saved our crossing."

JW
James & Tara W.
SV Meridian · Hallberg-Rassy 42
Get started free

Your boat deserves
a proper first mate.

Download Bosun free. Upload your first manual in under a minute. Your maintenance plan is ready before your next passage.

Download on the
App Store
Get it on
Google Play

Free to download  ·  No credit card required  ·  Works offline