About Feelmo

We don't guess your mood. We watch over your balance, gently.

Feelmo is a daily companion for iPhone and Apple Watch that uses the fluctuations of your heartbeat (HRV), read by Apple Watch, as a clue to gently watch over your autonomic balance. It isn't here to judge numbers or feelings. It's an app for quietly placing beside you — through the expressions of six companions — a sense of "how my body is settling right now."

What this app holds dear

At the root of Feelmo is the idea that we watch over not feelings or their valence, but how settled you are. Rather than declaring "this is how you feel right now," it gently observes how well the autonomic nervous system at your body's foundation is settling.

• We don't guess. We observe. — Instead of inferring emotions, we watch over your body's balance (how settled the autonomic nervous system is). The fluctuation of your heartbeat isn't a score that decides "good or bad" — it's a clue for getting to know you on a given day
• We affirm the "ordinary." — Even days that are neither good nor bad have real value. A day that passes uneventfully is also proof that your body is working steadily
• We read by your own baseline, not by others. — Your balance level isn't a ranking against anyone else. Feelmo uses your own recent average (your baseline) as the reference, looking only at "which way, and how much, are you swinging from there today"
• Your data is yours. — Data and scores derived from HRV stay, as a rule, inside your device. We don't automatically send it elsewhere, sell it, or track you. You can delete it anytime

How it works

Feelmo reads the HRV (heart-rate variability — the tiny fluctuations between one heartbeat and the next) recorded by Apple Watch, inside your device, through HealthKit. From that, it builds your Balance score — a 0–100 value showing how settled the autonomic nervous system is.

This score is built mainly around multiple HRV-derived clues, measurement quality, and movement from your own baseline. Put simply, it's an indicator that reflects "whether the autonomic nervous system is working with a comfortable, supple balance." The lower it is, the more things are unsettled; the higher it is, the more settled — that's how to read it.

But Feelmo doesn't just hand you a number. It first translates the balance level into the expressions of six companions (Genki, Odayaka, Futsuu, Fuan, Panku, and Tsukare), and places them quietly beside the score. This isn't a diagnosis — it's a window for turning an abstract number into "gentle words of observation that don't declare anything." For more, see Your Balance score and The Six Companions.

What you can do

Feelmo is made up of five tabs. Each is a small place for watching over, looking back, and settling.

• Home — Today's signs line up at a glance: the balance gauge (with the deviation from your own baseline), the key vital chips (latest HRV, resting heart rate, and sleep), your stress level, the HRV trend, how your balance has changed over the last 7 days, and more. More detailed vitals (wrist temperature, respiratory rate, blood oxygen SpO₂, and so on) can be seen under Wellbeing. Vitals are daily signs, not a diagnosis (the colorful look-back at your moods lives on the Trends and Mood Log tabs)
• Mood Log — Your mood, auto-recorded each day (with an optional note or adjustment), plus weekly/monthly/yearly look-backs, a calendar, charts, and recent logs. The longer you keep it up, the more your own rhythm comes into view (Mood Log)
• Breathing — Six guided breathing techniques matched to your state (to calm down / to lift up), guided by an on-screen breathing pacer. Slow breathing works in the direction of soothing the autonomic nervous system (Breathing)
• Trends — A place to look back on how your balance, autonomic balance, and HRV move over weeks, months, and years
• Wellbeing — A place to look back on vital signs and habits (sun exposure, steps, respiratory rate, sleep), along with sleep details and sun-exposure details (Wellbeing)

On top of that, the habit-impact analysis — Which habits help you, inside the Kokoro Report's "This week's insight" — checks individually whether a given habit actually moves your own balance (Which habits help you).

Feelmo Premium

Even as a free app, Feelmo has what you need for daily watching-over.

What's free — today's balance level and state, the six expressions, basic breathing (six techniques), today's habits, and the weekly, monthly, and yearly look-backs in the Mood Log.

What Premium unlocks:

• Long-term trends and the autonomic trajectory
• Tomorrow's condition forecast (with your weekday tendency calendar inside it)
• Which habits help you — the habit-impact analysis in the Kokoro Report (seeing "whether it works for you")
• The Kokoro Report (with a clinical-style PDF you can hand to your doctor)
• Habit look-back over past days (browsing days before yesterday)
• Yearly (12-month) sleep details (weekly and monthly stay free), and looking back at past days for sun exposure, steps, and respiratory rate (today and yesterday stay free; there are no monthly/yearly summary views)

Tapping a locked view — long-term trends, the yearly sleep view, a past-day look-back, and so on — opens the Paywall. For more, see Feelmo Premium.

The people who make it

Feelmo is made in Japan by Lumo, a research-led health-science studio. Its core heart-rate-variability (HRV) analysis was born from joint research with Keio University, and is built on top of Lumo Core, our shared analysis platform.

Our development home is in Higashi-Mikawa, Aichi. We're raising this app on land a little apart from the speed of the city, where the rhythm of everyday life still lingers.

What it doesn't do

Feelmo is not a medical device. Nor is it meant for diagnosis or treatment decisions. The balance level, the expressions, and the vital signs are all "clues for observing yourself" — they don't determine whether you have an illness. If a symptom concerns you, please don't decide on your own; always consult a medical professional.

Links

© 2026 Lumo. All rights reserved.

— A little light for your balance.