Energy, out of 10
Each day starts at 10. Activities and symptoms spend it, a nap can give some back, and the balance always stays between 1 and 10.
For iPhone, and on the web
Know where your energy goes. Log the day in a tap.
Kāyū is a quiet health log for people who live with limited energy. Each day starts at 10. Log what you did, how you feel, how you slept, your medications and your water, and watch the day add up in one place.
No ads, no tracking. Export everything to one CSV whenever you like.
Everything your day runs on
Kāyū is a log, not a coach. It doesn’t score you or tell you to do more. It keeps an honest record of the day, fast enough to use when you’re tired, so you can see the pattern later.
Log it with a reason
Most energy goes on something you did or something you felt. Pick the activity or symptom and its usual cost fills in. Or log it with no reason at all.
Sleep and naps
Bedtime, wake, minutes to fall asleep and how it went. A night belongs to the morning you wake up, and a nap can restore energy.
Medications and doses
Your list with dosages, groups like Morning and Bedtime, and one tap to take a whole group. Each dose keeps the dosage you actually took.
Symptoms you name
Your own list, each with a usual energy cost and the medications you associate with it. An association is yours to compare, not a claim of cause.
Water
Ounces toward the daily target you set, with +8, +12 and +16 oz one tap away on Today.
Notes
A line for anything the other logs don’t cover, timed like everything else and easy to search later.
Charts
Energy, what spent it, sleep, sleep quality, symptoms, doses and water over 14, 30 or 90 days, against your targets.
Gentle reminders
Water, medications, sleep and energy check-ins, set on your iPhone. A reminder is skipped once you’ve already logged it.
Widgets
Energy, water, sleep and medications on your Home Screen and Lock Screen, with buttons that log without opening the app.
A day that starts at 4 AM
A Kāyū day runs from 4:00 AM to 4:00 AM in your timezone, so a late night still counts as the day you lived it.
On the web too
The same account in your browser, with roomier tables and forms for going back over a week. Open the web app.
Your file
Export everything to one CSV, one row per event, to keep, share with a clinician, or open in a spreadsheet.
Private by default
No ads, no analytics, no tracking. Your records are private to your account, and you can delete it from the app. Privacy policy.
Any day, any time
Every log takes a time, so you can catch up tonight on this morning. Step back through past days on every screen and fix what you got wrong.
Energy
Every change has a reason
If you’ve ever said “I only have so much in me today”, this is that, written down. Log energy and Kāyū asks what it was for. Most of the time it was something you did, or something you felt.
- Activity first. Pick one of your own, like Coffee with Sam, or one of the everyday ones built in, like Shower or Groceries. Its usual cost fills in; change it if today was harder.
- Or a symptom. Headache, fatigue, brain fog: your list, your costs.
- Or no reason. Sometimes the day just takes it. Spend 1 to 9 with a note.
- Through the day lists every change in order with the balance after each one, so you can see exactly where it went.
Sleep
Sleep, the way you’d tell it
Not a tracker on your wrist. Just what happened: when you went to bed, when you got up, and how it felt.
- Night or nap, with bedtime and wake time. Time in bed is worked out for you.
- Minutes to fall asleep and a quality from Poor to Excellent, both optional.
- Naps can give energy back, up to 9, added to the day when the nap ends.
- Measured against your target, eight hours unless you choose another.
Medications
Take a whole group in one tap
Keep your medications, their dosages and how often you take them. Put them in groups that match your day, then log the group when you take it.
- Groups like Morning and Bedtime. A medication can sit in more than one.
- Take Morning right from the Today screen, or from a widget.
- Each dose remembers its dosage. Change a prescription later and your history stays true.
- Reminders at the times you choose, skipped when you’ve already taken that group.
Symptoms and water
The small things, counted
The details that are easy to forget by evening, and hard to remember at an appointment.
- Name your own symptoms, or pick from a list of common ones. Each has a usual energy cost.
- Associate medications with a symptom when you want to compare them over time.
- Water in a tap: +8, +12 or +16 oz, or any amount at any time.
- Fourteen days at a glance, with the days you reached your target in green.
Charts
See the pattern, not just the day
A bad day is just a day. A bad month has a shape. Charts show the weeks behind how you feel, ready to bring to your next appointment.
- Daily balance, and what spent it: activities and symptoms stacked.
- Sleep: time in bed against your target, quality, and minutes to fall asleep.
- Days with symptoms, medication doses and water, side by side.
- 14, 30 or 90 days, all from the same day rule the rest of the app uses.
Reminders and widgets
A nudge, only when you need one
Reminders are set on your iPhone and know what you’ve already logged. Nothing nags you about a glass you already drank.
- Water every hour or two through your day, held back once you reach your target.
- Medications at the times you choose, with a “Took them” button right on the notification.
- Sleep and energy check-ins, if you’d like them.
- Widgets for energy, water, sleep and medications, with buttons that log from your Home Screen.
A day that ends when you go to sleep
Midnight is a strange place to end a day. In Kāyū, a day runs from 4:00 AM to the next 4:00 AM in your timezone. The glass of water at 1 AM, the headache that kept you up, the night’s sleep you wake from: they all land on the day you’d say they belong to.
Every screen can step back to an earlier day, and every log can be edited, so catching up later is easy.
Your data
It’s your record. Take it with you.
Export everything you’ve logged to one CSV file whenever you like: one row per event, with the date, time, what it was, the amount, quality, energy change and your notes.
- Share it with a clinician, open it in Numbers or Excel, or keep it for yourself.
- Built on your device and handed to the share sheet. It goes only where you send it.
- No ads, no analytics, no tracking. Your records are private to your account.
- Delete your account from the app at any time, and everything stored with it goes too.
On the web too
Sign in at app.kayu.health with the same account. The web app has roomier tables and forms for going back over a week, editing anything, managing your lists, charts and export.
Kāyū is coming soon
Kāyū is on its way to the App Store for iPhone. In the meantime, the web app is open: create an account there and it carries straight over.