Today
A tap a day. That's it.
Every running change on one screen with a progress ring and your streak. Health-counted changes fill themselves in, and a quick “Close your day” check-in is there if you want it.
Habit tracker for iPhone and Apple Watch
You changed a habit. Did your body notice?
Tervy is a habit tracker for health changes like an earlier bedtime, weeknights without alcohol or a daily walk. Mark each one in a tap a day, and see what your sleep, resting heart rate and steps did meanwhile, in plain words.
Coming soon to the App Store- No account
- Health data stays on your iPhone
- Works with the Apple Watch you own
Sample data
- Stop guessing whether anything changed. Tervy puts what you did next to what your sleep and heart did, against your own normal, in plain words.
- Made for tired days. One tap marks your change in Tervy, and your Apple Watch counts sleep and steps for you.
- A rough day isn't a restart. Done, Not today and Skip all keep your streak, because an honest answer still counts.
Changes you can track, and many more
- Sleep more
- No screens in bed
- Strength training
- Drink more water
- No late meals
- Meditate
- Less phone time
- Sauna
- Earlier bedtime
- Daily walk
- Cardio
- Less alcohol
- Eat more vegetables
- Read more
- More daylight
- No smoking or vaping
- Same wake time
- Daily movement
- Stretch or mobility
- No coffee after noon
- Less sugar
- Journal
- Cold showers
- A new medication or supplement
- Your own change
Pick a ready-made start or name your own. A heart means Apple Health counts it for you, so it needs no tap at all.
How it works
Start a change. Mark it. Watch your body, not a score.
Three steps, then Tervy mostly runs itself. Most body signals move slowly, so the habit side gives you something to see from day one.
- 1
Pick one change
Choose a ready-made start (Earlier bedtime, No alcohol on weeknights, Daily walk, No coffee after noon) or name your own. Set a target and the days it runs.
- 2
Mark it in one tap
Done, Not today or Skip, from the app, a widget or your Apple Watch. Bedtime, sleep and steps are counted from Apple Health, so some days need no tap at all.
- 3
See what your body did meanwhile
After a couple of weeks, each change shows your resting heart rate, sleep and more since it started, against the weeks before. In words first, numbers second.
The whole picture
What you did. How you felt. What your body did.
Three lanes on one timeline, never added up into one number. You see them side by side, and you decide what they mean.
What you did
Done Not today Skip Off day
How you felt
Your own rating of each day
Resting heart rate
Each morning 7-day average Your usual range
↓ Lower is usually better
How to read resting heart rate
- What it is
- How many times your heart beats in a minute while you're still. Your watch works it out from the quiet moments of each day.
- Why lower is usually better
- A fit, well-recovered heart moves more blood with each beat, so it needs fewer beats at rest. Your own usual range matters more than anyone else's number.
- When a move matters
- A bpm or two from one day to the next is everyday noise. A move that holds for weeks, outside the shaded band, is worth noticing. The app shows what moved, not why.
Features
Everything a good habit tracker has. Plus your body, told honestly.
Colourful, quick and forgiving on the habit side. Careful and plain-spoken on the body side.
Grids and strength
Proof you kept going
A habit grid and a strength ring for every change. Strength is forgiving: one missed day dents it, it doesn't wipe it out. Best runs and weekly counts sit right underneath.
Your own normal
In your usual range, not “68% ready”
Every signal is described against your own recent weeks: in your usual range, higher, lower. The number comes second, and no reading is judged on a single day.
Since you started
Your recap, side by side
Done days across your changes, how you rated your days, and which body signals moved since you started, each in its own lane, with the counts behind it.
Honest answers
Nothing moved? It tells you so.
When your body stayed steady, Tervy says steady. A null result is still an answer, and it makes the times something did move worth believing.
Journal
Every day, in one place
A calendar of your days coloured by how they felt, each change's month at a glance, notes and tags you can search. Your own record, exportable any time as CSV or JSON.
Body
Your changes on top of your body
Resting and sleeping heart rate, sleep length and bedtime, steps, daylight, VO2 max and more, drawn under bands that show when each change ran.
Share
Your month, ready to post
A share card of what you did this month, with your body's side added only if you switch it on.
Sample data
Honest by design
Every other app sells you a number. Tervy will hold one back.
These rules are written into the app and checked by its tests. They're the reason you can believe it when it does say something moved.
What moved, not why
Tervy shows when each change started and what each signal did since. It never says which change caused it. You changed other things too, and only you know which.
Words before numbers
“Clearly lower”, “in your usual range”, “steady”. Always against your own recent weeks, never against a population average.
No verdict on thin data
No signal is judged until there are enough measured days, and a change needs enough days of its own plus history from before it. Until then, Tervy says it's too early.
Missing stays missing
A night your watch didn't record is shown as a gap, never filled in or smoothed over.
HRV is context, never a verdict
Heart rate variability from a wrist swings a lot from day to day. Tervy shows it, and never calls it good or bad.
Celebrate the doing, not the body
Streaks and strength are about what you did. A body number never feeds a score, a badge or a celebration.
Apple Watch, widgets, Shortcuts
The watch you own is enough.
No ring to buy, no strap, no new habit of wearing something. Tervy reads what your Apple Watch already records in Apple Health, and lets you mark your changes right from your wrist.
- Mark a change from the Watch, a Home Screen widget, a Lock Screen widget or Shortcuts
- Bedtime, sleep and steps are counted from Health automatically
- Oura and other wearables work too, if they write to Apple Health
Privacy
Your health data stays on your iPhone.
Tervy reads Apple Health on your device and works everything out there. There is no account to create and no Tervy server that stores your health history.
No account
Nothing to sign up for. Open the app and start.
Computed on device
Baselines, ranges and comparisons are calculated on your iPhone.
Never sold, never used for ads
Your health data isn't shared with advertisers or data brokers. Ever.
Yours to take
Export every change, answer, note and daily Health value as CSV or JSON.
Anonymous usage counts only
To learn which screens get used, the app sends anonymous events. Never health values, notes, ratings or change names.
Who it's for
Made for people who want to see something working.
Always tired at a desk
You know what you should change. You want to know whether it's doing anything before you give up on it.
Earlier bedtime · No coffee after noon · Daily walk
Watch owners who want answers
Your Apple Watch has years of data. You want it in plain words, against your own normal, with no score telling you how to feel.
Any change, with the full body timeline
Drinking less
Weeknights off, a dry month, fewer drinks. Alcohol is one of the changes a watch tends to pick up most clearly.
No alcohol on weeknights · Less alcohol
Busy, with broken routines
Kids, shifts, travel. You need a tracker that counts “Skip” as an honest answer, not a broken streak.
Daily walk · Drink more water · Earlier bedtime
Starting over
New year, new job, a turning point. Start one change at a time and keep a record of the whole run.
Any of them, one at a time
Why Tervy
Between a habit tracker and a readiness score
Habit trackers count the doing but can't show your body. Readiness apps score your body but don't know what you changed. Tervy puts both on one timeline.
| Habit trackers | Readiness and recovery apps |  Tervy | |
|---|---|---|---|
| Tracks the habit itself | Yes | Some, as a journal | Yes, in one tap a day |
| Shows your body alongside | No | Yes | Yes, from Apple Health |
| Gives you a daily score | No | Yes | No. Words against your own range |
| Tells you what a habit did to your body | — | Some do | Never. It shows what moved, not why |
| Missed day | Often resets the streak | — | Not today and Skip keep it |
| Hardware | None | Often its own ring or strap | The Apple Watch you own, or none |
A general comparison of the app categories, not of any single product.
Who makes it
Made by an independent developer, not a wellness company
Tervy is made by Jiří Urbášek, an independent iOS developer from Czechia with many years of building apps for Apple platforms.
Tervy exists because the apps around it each answer half the question. Habit trackers count streaks and ignore your body. Readiness apps score your body and ignore what you changed. Tervy shows both on one timeline, and is honest about what a watch can and can't tell you.
No investors, no ads, no data business. Questions and ideas go straight to the person who builds it.
— Jiří Urbášek, maker of Tervy
Questions, answered
What is Tervy?
Tervy is a habit tracker for iPhone and Apple Watch, built for health changes: sleep, alcohol, caffeine, movement, water, daylight, meditation and anything else you want to try. You start a change, mark it Done, Not today or Skip in one tap a day (or let Apple Health count it), and Tervy puts what you did, how your days felt and what your body did on one timeline. It reads resting heart rate, sleep, steps and many other signals from Apple Health and describes each one against your own usual range. It never claims which change caused what, and it says so when nothing moved. Everything is worked out on your iPhone, with no account.
Do I need an Apple Watch to use Tervy?
No. Tervy works as a habit tracker on iPhone alone. The body timeline needs data in Apple Health, which usually comes from an Apple Watch, though Oura and other wearables work too if they write to Apple Health. Some signals, like steps, also come from the iPhone itself.
Will Tervy tell me which habit improved my sleep or heart rate?
No, and that's on purpose. Tervy shows when each change started and what each body signal did since, against the weeks before. It never claims that a change caused a movement, because a watch can't know what else changed in your life. You see the facts side by side and decide.
Does Tervy give me a readiness or recovery score?
No. There is no daily score telling you how ready you are. Each signal is described in words against your own usual range, worked out from your own recent weeks, with the number second.
What can I track?
Any change you want to try. Ready-made starts cover sleep and bedtime, alcohol, caffeine, walking, movement and strength training, water, daylight, screens, meditation, cold showers, smoking and a new medication or supplement. A change can be yes/no, an amount with a target (“at least” or “at most”), or counted from Apple Health automatically, on every day or only on the days you choose.
Which body signals does Tervy read from Apple Health?
Resting heart rate (the main one), sleeping heart rate, walking heart rate, heart rate variability, sleep length, deep and REM sleep, bedtime, steps, exercise minutes, workouts, daylight, VO2 max, breathing rate, blood oxygen, wrist temperature, body weight, mindful minutes and drinks. You choose what to share in Apple Health's permission screen.
What happens to my streak if I miss a day?
Any honest answer keeps it. Done, Not today and Skip all count as accounting for the day, so a rough day or a day off doesn't end your run. Streak shields cover the occasional day you forget to answer at all.
How long before I see anything in my body data?
Usually a few weeks. Tervy waits until it has enough measured days of a signal and of the change, plus enough history from before the change started. If the difference is smaller than your normal day-to-day swing, Tervy says there's no clear difference rather than guessing.
Where is my health data stored?
On your iPhone (and your Apple Watch, for marks made there). Tervy reads Apple Health on your device and calculates everything locally. There is no account and no Tervy server that stores your health data, and you can export all of it as CSV or JSON.
Is Tervy a medical app?
No. Tervy is a habit tracker and a personal record. It doesn't diagnose, treat or prevent any condition, and it isn't a substitute for advice from a doctor.
Which devices does Tervy run on?
iPhone, with a companion app for Apple Watch. The App Store listing shows the current system requirements. Tervy is in English for now.
Every change starts with day one.
Pick one thing. Mark it once a day. See what your body did meanwhile.
Coming soon to the App Store