A diary that writes back. One question at a time.
Mendai Diary is a private journal with an AI companion in the margin. You write about your day; it notices, holds what you wrote beside the goal you set for yourself, and asks one open question. We're now opening it to a small group of preview users.
The page is yours. The companion stays in the margin.
The diary is built around one quiet loop. You shape a goal in conversation, you write about your days, and your companion reflects — never advising, never diagnosing, never grading. It notices what you wrote and hands the thinking back to you with a single question.
You decide who that companion is: its name, its tone, how present it should be. Then it's there whenever you reach for the page — at a pace set by you, not by streaks or reminders.
Begin
Name your companion, set its tone, and pick a focus: health, mood, sleep, mindfulness, or addiction. Consent is explicit and plain — your entries stay private, are never sold, and are deleted on request.
Shape a goal
In a short conversation, your companion helps you turn a half-formed thought into a goal that is genuinely yours: a clear wish, the obstacle in its way, and one small if–then plan. You commit it — it never does.
Write
Each entry gets one open question back, written to what you actually said and the goal standing behind it. Tappable nudges help you keep going when typing from a blank box feels hard.
Watch it bloom
Your writing grows a bloom on the home screen — heavier and lighter days become petals. A picture of your weeks, not a scoreboard. No streaks, no grades, no verdicts on your day.
Built on methods that hold up.
Nothing in the diary is decorative. Each part of the loop translates an established line of research into plain conversation — and stays inside firm limits while doing it.
Mental Contrasting
Goals take the wish–outcome–obstacle–plan shape that goal-setting research links to intentions that actually stick — drawn out in your own words, never prescribed.
Implementation Intentions
Plans become small if–then cues: when a specific moment comes, one specific thing. A format linked to markedly better follow-through than willpower alone.
Expressive Writing
Putting experience into words is linked to lower stress, and writing before bed to falling asleep faster. Naming a feeling as you write is linked to easing its intensity.
Reflective Questioning
One open question per entry, in tohe tradition of motivational interviewing: reflect rather than instruct, so the conclusions stay yours to reach.
The companion is an aid to therapy, never a substitute for it. It will not diagnose, prescribe, or score your progress. When an entry carries acute distress, it stops reflecting and points clearly toward human support. And it stays out of body-weight and calorie territory entirely — those conversations belong with a clinician.
We're taking on preview users.
The diary is ready for its first readers. We're opening it to a small group to write for a few weeks and tell us honestly what holds up and what doesn't.
Preview means preview: it's early software, some edges are still rough, and things will change — often because of what you tell us. In return you get the diary before anyone else and a direct line to the founders building it.
Your entries stay private, are never sold, and are deleted on request — the same promise you'll see again inside the app.
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