Run shared ownership clearly, fairly, and without spreadsheets.
Kai is the operating system for groups that share an aircraft, a boat, a car, or anything else expensive.
Booking, money, maintenance and conversations in one place everyone can trust — instead of WhatsApp threads, glove-box receipts, and the treasurer chasing four people for €40.
Everything in Kai is organised around a group — a flying club, a boat partnership, a family with a shared cabin, three friends and one car. The product follows how groups actually behave.
Before, and after
What changes when a group moves from improvised admin to a real system.
What your group does today
A WhatsApp thread nobody can scroll back through. A spreadsheet one person updates and everyone else trusts. Receipts that live in a glove box until they don't. A treasurer who's owed money by people they don't want to chase. Maintenance reminders that live in someone's head until something breaks.
What changes with Kai
A real shared calendar that refuses double bookings. Receipts that upload from a phone and split themselves by the rules you set. Live balances every member can see. Stripe payments that mark themselves paid. Maintenance that reminds itself, before things slip.
What Kai actually does
A real shared calendar
Stops the WhatsApp thread where "is the plane free Saturday?" goes to die.
- Conflict prevention that actually works — no two members showing up for the same slot
- Booking rules you can shape: quotas, peak-period caps, advance windows, per-asset configs
- Day, week and month views across all your assets
- iCal sync to Google Calendar, Apple Calendar or Outlook
Money, in the open
Live balances, automated splits, and online payments that settle themselves.
- Receipts upload from a phone; splits run on your group's rules
- Members see what they owe and what they're owed in real time
- Pay invoices in one click via Stripe — Kai marks them paid automatically
- Auto-sync to Yuki, Moneybird, Exact Online and e-Boekhouden — no quarter-end re-entry
Usage logged the right way
Real numbers feeding real costs — not estimates, not guesses.
- Hours, trips, distance or days — whatever your asset actually measures
- Cost attribution flows automatically from each entry into the right invoice
- Pilots: KML import from SkyDemon and ForeFlight pre-fills the log
- Per-asset and per-member breakdowns, exportable as CSV or PDF
Maintenance that doesn't slip
Scheduled service, hour-based intervals, squawks captured the moment they happen.
- Recurring maintenance with reminders before things are due — not after
- Meter-based intervals tied to the real usage log, not someone's memory
- Squawks reported with photos, attached to the asset, visible to everyone
- Overdue and upcoming alerts so nothing goes quietly past
Built for groups, not individuals
Roles, decisions, audit trails — the parts that make a co-ownership feel fair.
- Role-based access: owners, admins, members, students, guests
- Transparent balances and responsibilities so nobody has to guess
- Shared rules and lightweight voting for group decisions
- Full audit trail with timestamps and user attribution
One place for the conversation
Asset-related messages live next to the calendar and costs — not in a chat app nobody searches.
- Group messaging and threads you can actually find later
- Bulletin board for announcements that reach everyone
- Meeting polls so "when can we meet?" takes one round, not ten
- In-app notifications with sensible defaults
Talk to your data with Claude
Natural-language queries across bookings, expenses, maintenance and members — plus a real API for what you want to build yourself.
- MCP server for Claude Desktop and Claude Code
- Ask plain-English questions across all your asset data
- API key management with per-key usage tracking
- 14+ tools out of the box; npm install — set up in under a minute
Built for real groups, real assets
Kai adapts to how your group actually operates — not the other way around.
Aircraft and flying clubs
- Hobbs- and tach-driven cost calculation
- Automatic 100-hour and annual reminders
- Squawks tied to the aircraft, not buried in a chat
- Fair-access rules for the Saturday morning slot
Cars and shared vehicles
- Odometer-based usage and fuel tracking
- Hybrid splits — fixed costs equal, variable by use
- A shared calendar everyone actually trusts
- Reimbursements with receipts, not WhatsApp screenshots
Boats, properties, simulators, and more
Yacht co-ownerships, holiday homes, training simulators, shared equipment.
- Asset-specific fields and workflows
- Flexible usage models per asset type
- Shared documents and history that don't get lost