Vision
One sentence
A logbook is a folder of plain files that records what happened to you, that only you hold, and that anything can plug into.
Three ideas, and only three
The record. Everything that happened to you, written down once, in files you own. Your phone, photos, calendar, messages and every other export you can get your hands on flow into one append-only, hash-chained log. Nothing is ever edited. Nothing is ever pruned. If every app you use disappeared tomorrow, the record stays.
The recount. The record reads your life back to you without your effort. Every day gets a page. Days become trips, trips become chapters; people, places, meals, decisions and achievements appear on their own. You only confirm, correct, and add a line in your own words. A diary asks you to write; a logbook writes you.
The circle. You hand a page to a named person, and they hand one back. Two logbooks, one shared moment, each side keeps its own words and photos. No audience, no feed, no counts — you see their side of a dinner because you were at the dinner.
What it refuses to have
The opposite of social media is not a feature; it is a list of things the product will never contain:
- no feed, no timeline of other people
- no followers, likes, reactions, or view counts
- no ranking, no algorithm choosing what you see
- no public-by-default; every share names a person
- no streaks, no scores, no metrics near people
- no engagement loop; there is one evening question and it can be ignored forever
- nothing leaves without a named recipient
Reveal, never reward
A logbook may reveal — your first time in a country, your hundredth flight hour, the year with the most dinners at home — and may never reward. Revealing invites gratitude; rewarding invites compulsion. That single line is the product philosophy, and it is the line social media crossed.
Life is an adventure that can only be replayed when it is logged, the way chess is a game because the board remembers every move. The logbook is the board. The adventure is yours.
Why "logbook"
Pilots and sailors keep logbooks: dated, factual, in order, never edited, kept for years because one day someone needs to know what actually happened. Computing borrowed the word — log files, the commit log, the write-ahead log — for an append-only record that is the source of truth from which everything else is derived. That is exactly the structure here. The name is not a metaphor from computing; it is the original object computing took the metaphor from, returned to its purpose: a person keeping a true record of a voyage.
Where it can go
A logbook is signed by a key only you hold. A long, verifiable record that belongs to a key is a stronger claim of identity than any platform can issue — not who you are, but what happened to you, proven by you. We are modest about this in year one. The first real protocol question is how two logbooks exchange a page. Get that right and the rest follows.