Drained for no reason? Brain fog out of nowhere, then weirdly unstoppable two days later? It's not random. Since the day you were born, four cycles have been running your energy, mood, focus, and gut. RhythmBio maps all four from your birthday and tells you what today's actually built for.
Since the day you were born, four cycles have quietly run your energy, mood, focus, and gut. They never pause. RhythmBio just shows you where each one's at, today and for the next 90 days.
Energy, strength, how tired you feel. That drained day isn't laziness, your body's just in a dip.
Mood, patience, social battery. Everything hits harder near the bottom of this one.
Focus, memory, decisions. The 'why can't I think today' days live right here.
Gut instinct and creativity. Trust the hunch on a peak; sleep on it during a low.
Each cycle is a simple sine wave. Layer all four and you get a pattern no one else has: your rhythm for any day, past or future, from a single number, your birthday.
sin(2π × days_since_birth ÷ period). No surveys, no guesswork. Math.
We're not asking you to. Log how you actually feel for 7 days and let your own journal tell you whether your wave is real.
The same math runs forward and back. Plot 90 days ahead, then test it against your own log.
Same birthday twins share a wave. Everyone else has a unique signature.
Every day, the app actually does something with your numbers, not just show them to you.
Every morning, an actual paragraph about your day, not a score in a vacuum, using your real cycle positions from that morning.
Add the people you live with. Get relationship-aware plays, age-appropriate conversation starters, and a plain-English playbook for the days someone's cycle is crossing zero.
See every peak and dip coming weeks out, so the big ask, the launch, or the trip lands on a day built for it.
Log how you actually feel for a week. Your journal shows how closely real life tracked the prediction, and keeps a streak while you do it.
A short email summing up the week that was and the one about to start, so Monday morning isn't the first time you've thought about it.
Turn on push and wake up to tomorrow's score before you've even opened the app.
Not a wellness lecture. Practical tools for the decisions you're already making.
See where your peaks land. Block the deep work, the talks, the asks. Avoid stacking critical days into a low.
Coordination and stamina spike with the 23-day cycle. Hit PRs when the math says yes; rest when it says no.
Empathy peaks with emotional cycles. Pick the date on the upswing, for both of you if you're tracking together.
Save the strategy doc, the architecture review, the pitch deck for an intellectual peak. Your brain is literally on.
Free forever for one person, no card required. Every new account also gets 7 days of full Pro, on us, so you see what it's like before deciding.
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Free forever for one person. Add your birthday, see your next 90 days, and start clocking your own patterns.