For boat co-ownership groups
MitReeder keeps your group’s shares, bookings and expenses — so the season ends with accounts that balance. No spreadsheet, no receipts in a jacket pocket.
€149 per boat per year · any number of members · on the web and in the Rubberduck app · eleven languages
| Owner | Share | Paid out | Balance |
|---|---|---|---|
| Anke Share of costs 1.911,00 € |
300 ‰ | 2.400,00 | + 489,00 |
| Bernd Share of costs 1.911,00 € |
300 ‰ | 1.540,00 | − 371,00 |
| Carla Share of costs 1.274,00 € |
200 ‰ | 1.150,00 | − 124,00 |
| Dirk Share of costs 1.274,00 € |
200 ‰ | 1.280,00 | + 6,00 |
The three questions
Most groups agree quickly about the boat itself. It gets laborious with three questions that come back every season.
One takes three weeks in high season, another a few long weekends. When planning the next season, it helps to have last season’s numbers at hand.
A season easily brings a dozen invoices, paid by different people. Come spring, pulling them together costs a whole evening.
Two weekends of antifouling is a contribution that appears on no invoice. A spreadsheet has no column for it — MitReeder does.
The heart of it
Berth, insurance, winter storage, craning, antifouling, diesel, harbour dues, boatyard — a season brings a great many receipts, fronted by different people. Gathering them in January costs you an evening. Entering them as they come means the accounts are already done.
Three things hang on every item, and you will need them later:
Invoice, receipt or till slip — photographed where it occurs and tied to the item. Nobody has to hunt for it in spring.
Who entered or changed which amount, and when — readable long after the season is over.
Every item, the share-based split and the balances in one document. Once produced, it stays as it is — even if someone leaves later.
Bookings
Any spreadsheet can hold bookings. MitReeder counts along — nights, weekends and peak-season weeks per person, set beside each share. That helps most when planning: knowing last season’s numbers makes the next one easier to divide.
On the dock, not at a desk
MitReeder has no app of its own. Bookings and accounts appear in Rubberduck — our sailing logbook for iPhone and Android, which records the passage almost by itself and, if you like, publishes it to your own logbook on kielwasser.blog.
If you already use Rubberduck, there is nothing to install. If you don’t, it comes with it — for every member of the group, for good. One login, one app, one place to look.
Rubberduck — Sailing Log NMEA
The MitReeder views appear as soon as the boat has an active subscription — for every member, with no per-person surcharge.
What’s included
Everything you need over a season — and nothing that needs training.
Who holds how much, and since when. In per mille, so thirds come out even. Leaving is dated, never deleted — old accounts stay traceable.
Book, swap, and settle the high season in a round of wishes — in an order that moves on every year. That way everyone gets the August weeks in turn.
Berth, insurance, winter storage, maintenance — every item with its receipt. The ship’s kitty of a single passage stays separate.
Fixed costs by share, down to the cent. Nothing is rounded — even after years, nothing adds up that no one can explain.
Your hours appear in the yearly overview, even without a value in money. They count towards the accounts only once you have agreed an hourly rate.
Insurance policy, yard invoices, the agreement — at hand when someone asks. Reachable only through your login, not through a link.
Guides
Six articles on the questions that come before the first berth — legal form, shares, bookings, costs.
Legal form, shares, use, costs: the decisions that are easy at the start and hard to change later.
How shares are set, what happens when someone joins, and how a departure is arranged without having to sell the…
How a co-ownership divides the season without having to negotiate it afresh every year.
Separating fixed costs, consumption and upkeep cleanly — and why what you used on your own week is nobody else's…
The running costs of a ten-metre yacht, broken down — and what is left per head with four co-owners.
Ten points that later give rise to questions.
Price
Three of you or six — the price is the same. The more of you there are, the less it costs each.
Frequent questions
No. MitReeder keeps shares, bookings and expenses — it is a group’s bookkeeping, not its contract. What you agree among yourselves stays between you.
Every item carries its own receipt — invoice, receipt or till slip, photographed and tied to the line. MitReeder also keeps a change history: who entered or changed which amount, and when. At year end both appear in the statement, which then stays unchanged.
Their share gets an end date; it is not deleted. Old accounts stay traceable — even years later, when somebody asks how it was calculated back then.
No. Everything works in the browser too. The app is for the moments when nobody is at a computer — in the harbour, on the way to the dock.
All co-owners see shares, bookings, expenses and accounts, and may book and enter expenses too. Assigning shares and administering the group is for whoever keeps the logbook. Crew without a share see none of it.
The service ends when the year runs out — bookings, expenses and accounts are then no longer available. You can download all your data beforehand, and the logbook stays unlocked.
€149, the same as for any other group. With five members that is just under €34 each per year.
On our own servers in Germany — inside the EU and therefore under the GDPR. Invoices and documents are not open on the web: they are reachable only through your login, not through a link that can be passed on.
How it begins
Name, home port, shares. If you already keep a logbook on kielwasser.blog, boat and crew come from there.
Everyone gets an invitation by email and sets their own password — anyone with a Kielwasser account simply uses that. No second password.
A round of wishes for the high season, enter the costs, done. The accounts take shape along the way.