Until Your Balance Grows In
Your Balance score (your heart's sense of balance, 0–100) isn't "all about you" right from the start. Before Feelmo has carefully finished learning what "normal" looks like for you, there's a growing-in period of about two weeks. This page walks through what's happening during that time, how the display changes along the way, and how to read it.
First, the important thing
You can use Feelmo even while it's still growing in. There's no need to rush to decode the numbers. "Wear your Apple Watch and go to sleep" — that alone is enough for your baseline to grow in quietly.
Where the Balance score comes from
The Balance score is calculated from the HRV (heart rate variability / the fluctuation in R-R intervals) recorded by your Apple Watch. Your heartbeat may seem perfectly regular, but in fact it gently stretches and contracts. This fluctuation is a sign that your autonomic nervous system is finely tuning your body.
Within HRV, Feelmo builds the Balance score from multiple HRV-derived clues, measurement quality, and movement from your own baseline.
- Feelmo treats HRV-derived clues as ingredients, not as public score components.
- The exact composition and weighting are not disclosed publicly.
The Balance score is read in a gentle direction: low = unsettled, high = balanced. But this score means the most not when compared with other people, but when compared with your own baseline. That's exactly why we first need to learn what "normal" is for you — and that learning takes about two weeks.
Three stages
Over the first two weeks, the way Feelmo builds the display shifts little by little behind the scenes.
| Period | What's happening inside Feelmo |
|---|---|
| Days 1–3 | You don't have much data yet, so Feelmo borrows standard values to show your score. This is the stage where it points to your "rough position." |
| Days 4–13 | Feelmo gradually blends your own data with the standard values. The more days pass, the more it leans "toward you." |
| Day 14 onward | It lets go of the standard values and reads from your own baseline alone. |
Why not make it "all about you" from the very start? Because if it were decided from just a few days of data, it would be pulled too much by one chance day. By blending and shifting little by little, a calm, steady measuring stick grows in — one that doesn't swing abruptly.
While the "Learning" label is showing in the app, you're still in this growing-in period. You can also check there for an estimate of how many days remain. When the label disappears, it's a sign that your baseline has settled in for now.
Your "usual range" appears
As learning progresses, a band showing your "usual range" appears around the Balance score. The Home-screen balance gauge gently shows that deviation with a "vs. usual (±N)" badge and a range gauge.
- Days inside the band … the usual you. No need to worry much.
- Days above the band … a sign you're leaning more balanced than usual.
- Days below the band … a sign you're leaning more unsettled than usual. Rest or breathing might help.
The Balance score means the most when read in relation to this band. Look at "how does today compare with usual?" rather than at how high or low the score is on its own.
The width of the band differs from person to person. People whose days vary a lot have a wider band; those who are stable have a narrower one. Neither is better or worse — that's simply the shape of your "normal."
Expressions, not just scores
Feelmo doesn't confront you with the Balance score as a bare number. Six companions — Genki (cheerful), Odayaka (calm), Futsuu (so-so), Fuan (uneasy), Panku (overwhelmed), and Tsukare (worn out) — translate the day's Balance score into gentle, observational words and set them right alongside it. On days when the numbers are hard to read, try starting with the expressions. They never assert anything; it's only a watchful "maybe it feels something like this right now."
It's okay if you take a day off
Even if there's a night you forget to wear your Apple Watch, the learning does not start over from scratch. The days you've learned so far stay stacked up, and the next night simply picks up where you left off.
Measurement at the wrist is a little sensitive to body movement, so it reads more steadily while you're sitting still or asleep. Even if there are days that don't come through well, there's no need to rush. As you keep going, your baseline naturally fills in.
What you can do once it's grown in
Once your baseline has settled in, the very way the Balance score is read becomes "all about you." If you keep using it for even longer, Feelmo Premium opens up watchful features built on top of your baseline: long-term trends, a tomorrow's-condition forecast, an autonomic trajectory, and the habit-impact analysis (Which habits help you, in the Kokoro Report's "This week's insight") that checks whether things like breathing truly move your own balance.
Even on the free plan, you can use today's Balance score and state, the six expressions, basic breathing, today's habits, and the weekly view. For now, let's spend two weeks growing it in with your shoulders relaxed.
How to spend the first two weeks
Don't rush to attach meaning to the numbers — just "wear it and sleep" is plenty. We also walk through what the first week looks like in Your First Week.
A note, though
Neither your baseline nor your Balance score is a medical reference value. Feelmo is not a medical device, and it does not diagnose or treat anything. These are a measuring stick for watchful care that reflects your own tendencies. If there's a change in your body that worries you, please consult a medical professional.