Built for life at sea

Track every day at sea.

For seafarers who do their own paperwork. Track every day at sea, every dollar earned, every expense in every port you visit.

Free · No subscription · Offline
Seaman Log dashboard
Days at sea logged by the crew on board
Currencies converted at live rates
Rotations closed and archived
Seafarers using Seaman Log

A logbook,
not a dashboard.

Days, rate, expenses, currency, rotation — the fields that decide what you take home. Designed to open with one hand, in poor light, on a moving deck.

Days at sea, counted.

Open the app, tap once. Every rotation builds a record of where you were, what you ran, what you earned.

Spend in any currency.

Live rates from Open Exchange. Convert at expense date or today — the math stays honest either way.

Rotation history.

Every closed rotation archived with vessel, location, role, and totals. Export PDF for your records or HR.

Offline-first.

Built for satellite gaps, port WiFi, dead zones. Everything saves locally and syncs when you surface.

Daily pace.

Earnings to date, daily rate, projected total — see how the rotation tracks against your contract.

Yours, encrypted.

Multi-device sync, end-to-end encrypted. We hold the pipes; we never read what you write.

How it works

Open. Log. Close.

Three motions. Built around the rhythm of a rotation, not a productivity blog.

01

Start a rotation when you board.

Vessel, role, start date, daily rate. The app starts counting — every day at sea logged from now until you sign off.

02

Log the small stuff as it happens.

Dinner in port, SIM card in Singapore, taxi to the heliport. Any currency. The conversion happens later, with the right rate, automatically.

03

Close the rotation. Keep the record.

End date, final totals, PDF for your files. The rotation archives. The next one starts when you board again.

Inside the app

Ten screens.
One working logbook.

Captured live on iPhone — real rotation, real numbers. Drag to scroll.

Active rotationDays at sea, live counter
ForecastConditions & quick log
Trips listActive hero, history below
Logged daysPer-rotation calendar
Net profitCash advance & allowance
Earnings lookupFX-aware queries
Expenses · live FXMulti-currency breakdown
StatsAll-time, YTD, MTD
ProfileVessels, rates, currency
Sign inMagic link, offline mode
Trust

Honest now, honest later.

The core log will always be free. Advanced features may move to a paid tier in the future — and when they do, we'll tell you exactly what they are before we charge for anything. No surprise.

Free at launch.

Right now Seaman Log is free for everyone. Later, advanced features (multi-vessel manager accounts, accountant CSV exports, team rosters) may move to a paid tier. The core log — your days, rate, expenses, rotation — stays free for individual seafarers. We'll be specific about what's premium before any switch is flipped.

Your data stays yours.

End-to-end encrypted sync. We hold ciphertext; only your devices hold the key. Nobody at Seaman Log can read your ledger.

Delete anytime.

One tap in settings. Account, history, sync state — purged in 30 seconds, no support email required.

FAQ

Questions
from the deck.

Anything missing? support@seamanlog.com — answered by humans who have run a deck shift.

Yes. No paid tiers, no in-app purchases, no ads, no telemetry brokered to third parties. The app is funded by the founders directly. If that ever changes, we'll tell you in plain English and give you a clean export first.
Built for it. Every entry — days, expenses, rates — is written locally first. Sync happens when you reach signal. Multi-device merge is conflict-aware; nothing is lost.
42 today, including USD, EUR, GBP, SGD, NOK, EGP, BRL, MXN, INR, PHP, IDR, MYR, AUD, NZD, ZAR, AED, KRW, JPY. Live rates via Open Exchange Rates with timestamped audit trail per expense.
Per-rotation PDF and a full CSV/JSON archive of everything you've ever logged, anytime, from settings. The data is yours. The format is open.
f your work is measured in days at sea and rotations, this is for you. That includes ROV operators, divers, drillers, riggers, vessel officers, marine engineers, surveyors, crane operators, wind farm techs, and anyone else on a rotation contract. The app doesn't care about your trade — it cares that the math is right.
No. Seaman Log is a personal app. We do not sell crewing software or talk to your company. Your account, your data, your records — independent of any operator.

Built for life
at sea.

Free. Offline-first. No subscription. No ads.