Why I built VesselTwin

When I bought my boat — a 2018 Cutwater, my first — the previous owner handed me the keys, a walkthrough, and a three-ring binder.

The binder was the boat's memory. Receipts, some highlighted manual pages, a business card from a mechanic two states away, and handwritten notes that clearly meant something to somebody once. Behind the helm I found wiring that went somewhere important, installed by someone thoughtful, documented nowhere. My first season was equal parts boating and archaeology.

Here's the thing though: I wasn't annoyed. Slowly figuring out the boat — what was original, what was upgraded, what that switch does — turned out to be one of the real pleasures of ownership. Every small mystery solved made the boat a little more mine. What did bother me was knowing that all of it — everything the previous owner learned, everything I was learning — lived in formats designed to be lost: binders, camera rolls, text threads with mechanics, forum posts I'd never find again.

Boats deserve better memories. A boat is often the most complicated machine a person owns — plumbing, electrical, propulsion, electronics, all marinating in salt water — and it routinely outlives its owners' tenure. The average boat changes hands every handful of years, and each time, most of what's known about it evaporates.

I write software for a living, so I did the predictable thing.

A living record

VesselTwin is the record I wished had come with my boat. Everything in one place, organized around the boat itself: maintenance history, documents and manuals, photos by zone (engine room, helm, bilge), parts with real fits-my-boat notes, measurements, expenses. Upload the factory manual and it reads it — specs fill themselves in instead of you typing them from page 47.

It's built for the moments that actually test a record. When a mechanic asks “what's been done to it?”, you send a link with exactly the relevant history and photos — no app required on their end, and it expires when the job's done. And when you someday sell the boat, the record is the asset the next owner never gets: not a binder, but the boat's actual story, transferable with the boat.

The part I care about most

Somewhere out there, someone with your exact model has already solved the problem you're staring at. They found the part that actually fits. They know the impeller interval the manual is optimistic about. Today that knowledge is scattered across forums, Facebook groups, and dock conversations — real, valuable, and nearly impossible to find when you need it.

So VesselTwin has shared model pages: known issues, real-world maintenance intervals, parts compatibility, and step-by-step upgrade write-ups, pooled from owners who choose to share. Private by default — nothing about your boat is visible to anyone unless you explicitly share it, and boat identifiers are scrubbed from anything public. But when owners do share, every future owner of that model benefits. That's the flywheel I want to spin: boats getting collectively smarter.

The straight answers

Is it free? For one boat, yes — genuinely, not as a trial. Full record-keeping, full community access, and enough AI to digitize your binder. Paid tiers cover multi-boat owners, heavier AI use, and business features for fleets and service shops. The rule I've committed to: core record-keeping never gets metered. The record is the point; taxing it would be self-defeating.

What about my data? Yours. Export it any time. No ads, no selling personal data — sustainability comes from subscriptions and services, not from you being the product.

Who's behind it? Me, mostly — one owner in Seattle with a boat, a binder, and a compulsion. Which is exactly why I'm writing this: VesselTwin gets better at the rate real owners tell me what's wrong with it.

If any of this resonates, add your boat — and then tell me what's clunky. I answer everything.

— JC