AstroTeks

AstroTeks turns your Apple Watch into a living instrument for breath, biometrics, and the rhythm of the sky — a standalone watchOS app that runs entirely on your wrist. WHAT IT DOES AstroTeks reads the sensors Apple already built into your Watch — heart rate, heart rate variability, blood oxygen, and respiratory rate — and turns them into a single, personal Heart-Sky Sync score for reflection and mindfulness. At the same time, a complete planetary ephemeris (VSOP87, the same orbital model used in professional astronomy software) runs directly on the chip in your Watch, with no server and no internet required. Nothing leaves your wrist. It is, as far as we know, the only standalone Apple Watch app that fuses live biometric data with real on-device astronomy. GUIDED BREATHWORK The heart of the app is a guided breathing practice. Choose 3, 5, 10, or 20 minutes. An element-colored circle expands and contracts while the Taptic Engine paces each inhale and exhale through your wrist. FIVE LIVING SURFACES Pulse — your main face. A living ember glow, your Heart-Sky Sync, the planetary hour, and the moon a tap away. Dawn — a quiet morning screen: moon phase, a short reflective line, yesterday's score, and your coherence streak. Heart-Sky Sync — a gauge built from four sensors: HRV (40%), heart rate (30%), blood oxygen (15%), respiratory rate (15%). Lunar Breath — guided breathing, anchored to the current moon phase. Crown Scroll — turn the Digital Crown through 14 days of sky weather, a haptic detent on each step. FIVE COMPLICATIONS Coherence ring, Heart-Sky gauge, moon phase, planetary hour, and sky weather — all Smart Stack aware. BUILT FOR THE WATCH, NOT PORTED TO IT Optical heart rate, HRV, blood oxygen, respiratory rate. Digital Crown with haptic detents. Taptic Engine for breath pacing. Always-On Display. HealthKit read and write. CoreLocation for accurate planetary hours. WidgetKit complications. Extended runtime for full breathing sessions. PRIVATE BY DESIGN All astronomy is computed on-device. All biometric data stays in Apple's Health sandbox on your Watch. No accounts. No cloud. No analytics. No ads. No subscriptions. No third-party SDKs. A NOTE ON THE SKY The moon phases, planetary hours, and zodiac positions in AstroTeks are computed astronomy — real positions of real bodies — offered for reflection, rhythm, and mindfulness. AstroTeks makes no medical, predictive, or diagnostic claims. The Heart-Sky Sync score is a personal wellness signal drawn from your own biometrics, nothing more. Free, forever.