Your body knows before you do. MindGrain shows you what it's saying.
How you slept. How your heart recovered. How precisely you type. Thirteen signals converge into one picture — your grain. The daily fingerprint of how your body shapes how you think.
MindGrain reads from Apple Health — heart rate variability, sleep, resting heart rate, and twelve more signals — and optionally captures the timing of your typing. Not what you type. Just how you type. It builds a personal baseline over your first week, then quietly watches for the moments when something shifts.
When it notices something, it tells you — with the warmth of a companion who's been paying attention. Not a dashboard. Not a verdict. A mirror that connects what's happening in your body to what you're experiencing in your mind.
Wearables measure inputs to the body. MindGrain measures output from the mind.
What MindGrain reads
Thirteen signals. One picture.
Every signal feeds a single composite — your Grain. It reflects how closely today matches your personal normal. Not a health score. Not a rating. A mirror. You choose which signals to enable — MindGrain works with whatever you're comfortable sharing.
Sleep
Duration, regularity, and timing from Apple Health. The strongest predictor of your next-day clarity.
Heart Rate Variability
Your autonomic nervous system's flexibility. One of the earliest signals to shift — often before you feel it.
Typing Precision
How you type — timing, corrections, hand balance. Your cognitive-motor output, captured silently through the MindGrain keyboard.
Movement & Gait
Steps, walking speed, stride length — your body's most honest signal about how it's actually doing.
Resting Heart Rate
Subtle shifts in your RHR reflect stress, recovery, and autonomic balance day to day.
Environment
Air quality, noise exposure, daylight — the invisible forces that shape your cognitive day without you noticing.
Circadian Alignment
How well your sleep timing matches your body's preferred schedule — including the weekly drift of social jet lag.
Your Context
Tags you add — caffeine, stress, medication — so MindGrain can connect what you did to what you felt.
What you'll discover
Your patterns. Your connections.
01
How last night shows up in today
Sleep debt is cumulative. MindGrain tracks the lag between what happened overnight and how your mind responds — often 1-3 days later. One good night doesn't erase a bad week, and MindGrain will tell you that.
02
When your mind is sharpest — and why
Not generic advice about chronotypes. Your actual patterns, learned from your data — which hours, which days, which conditions bring out your best cognitive performance.
03
What triggers your dips and how fast you recover
Caffeine, stress, travel, illness — MindGrain learns which factors shift your grain and builds personal recovery signatures. Not averages. Yours.
04
The invisible effects you can't feel happening
11 hours in a noisy environment. Poor air quality. Too little daylight. These shape your cognition without you knowing. MindGrain makes the invisible visible.
Grounded in science
Every insight traces back to peer-reviewed research.
MindGrain doesn't guess. Its knowledge engine draws on decades of published research in cognitive neuroscience, chronobiology, motor control, and digital biomarkers. When MindGrain tells you something, it can show you the science behind it.
Keystroke Dynamics
Typing precision degrades before speed during cognitive fatigue — your brain compensates to maintain output while accuracy quietly declines. MindGrain detects this pattern using methods validated in Parkinson's and cognitive decline research.
Chronic sleep restriction accumulates as cognitive debt that takes multiple nights to repay — not just one good night. Sleep regularity predicts health outcomes more strongly than sleep duration alone.
Van Dongen 2003 · Lunsford-Avery 2018 · Walker 2017
Heart Rate Variability
HRV reflects autonomic nervous system flexibility and is one of the earliest physiological markers to shift under stress, illness, or poor recovery — often hours before you notice anything.
Sustained noise above 70 dB draws on the same attentional resources used for focused work. Air pollution, even at levels considered "safe," measurably affects cognitive performance. Daylight exposure anchors circadian timing.
Walking speed is sensitive to overall physiological state — fatigue, inflammation, mood. It's difficult to consciously mask, making it one of the body's most reliable ambient signals.
Studenski 2011 · Hausdorff 2005
Circadian & Social Jet Lag
The weekly mismatch between your weekday and weekend sleep timing disrupts circadian alignment even when total sleep is adequate. Over 70% of people experience at least one hour of social jet lag per week.
Wittmann 2006 · Roenneberg 2012 · Abbott 2018
In the app, every insight links to a "Show me the science" door — tappable references that explain what research underpins what MindGrain just told you. No black boxes. No trust-me claims. The evidence is always one tap away.
Apple Intelligence
Ask MindGrain about your day.
On iPhone 15 Pro and later, MindGrain uses Apple's on-device foundation model to answer questions about your data in natural language — fully offline, fully private. Ask what shifted. Ask why. Ask what connects to what.
ASK MINDGRAIN
⌃
Why do I feel off today even though I slept well?
You slept 8.2 hours — more than your recent average. But your HRV tells a different story: it dropped to 34ms overnight, down from your usual 48ms. That often happens after a physically demanding day, and you were in a loud environment for over 11 hours yesterday.
Your typing precision is actually better than baseline this morning — so your motor system has recovered. But the autonomic lag from yesterday's stress is still showing. Based on your pattern, this usually resolves within a day.
Ask about your day...
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Private by design
Your data never leaves your phone.
Every computation happens on your device. No cloud. No accounts. No analytics. MindGrain doesn't even have a server. The keyboard extension has zero network entitlements — it is physically incapable of transmitting data.
No text captured
The keyboard reads timing between keypresses and key categories — never which specific letters, words, or messages you type.
No tracking, no analytics
No SDKs. No identifiers. No fingerprinting. Nothing is linked to your identity in Apple's privacy nutrition labels.
On-device intelligence
Apple's foundation model runs locally on your phone. No OpenAI, no cloud inference, no third-party AI. Your questions and MindGrain's answers never touch a server — not even Apple's.
Early access
MindGrain is launching soon.
Built for people who notice — who want to understand the connection between their body and their mind.
Get notified when MindGrain launches on TestFlight.
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