Stilla — Resonance Breathing

Stilla — Swedish for "calm" — is resonance breathing, simplified. Most breathing apps make you follow a fixed rhythm. Stilla finds YOURS. Everyone has a resonance rate — the breathing pace, somewhere between 4.5 and 6.5 breaths per minute, where heart and breath fall into step and the body's relaxation response engages most deeply. Connect a heart-rate sensor and Stilla discovers your rate session by session, then keeps you there. BREATHE • A calm, luminous guide — a blooming flower, drifting stars, a tidal pool, or lakeside reeds swaying with your breath • Resonance, Box (4-4-4-4), and 4-7-8 patterns — at their classic tempo or yours, with per-pattern presets and fully custom timings • Adaptive pace: in resonance sessions, Stilla can retune the rhythm live, epoch by epoch, toward the rate your heart follows most strongly • Any session length from 1 to 60 minutes • Gentle haptics — holds get their own distinct cue — and an adaptive soundscape that follows your breath • Sessions continue on your Lock Screen and Dynamic Island • Apple Watch taps guide each breath from your wrist UNDERSTAND • Heart-breath sync, measured — spectral coherence between your heart rhythm and your breathing • Every pattern read on its own physiological terms: sync and heart-rhythm swing for Resonance, heart settling for Box and 4-7-8 • Post-session HRV insight: RMSSD, heart-rate swing, and signal quality • Trends over weeks: every session charted, any metrics overlaid • One honest finding at a time — like "your sync runs higher after 19:00" • Practice rhythm, pattern comparison, milestones, and streaks PRIVATE BY DESIGN • No account. No analytics. No network access at all. • Your data lives on your device and, with your permission, in Apple Health • Sessions log as Mindful Minutes WORKS WITH • Apple Watch (heartbeat intervals during sessions) • Bluetooth heart-rate straps (Polar, Garmin, Wahoo, and any standard BLE heart-rate monitor) • Works fully without any sensor — guidance, patterns, and streaks