ShiftRhythm vs Quiet Sleep Sounds

Night shifts flipped your sleep? Enter your roster and ShiftRhythm tells you when to sleep, when to nap, and when to seek or avoid light — today. WHAT IT DOES • 24-hour body-clock dial — see your estimated melatonin onset (DLMO) and biological night (CBTmin) at a glance • Light, nap & caffeine guidance — timed to your circadian rhythm and updated as your shifts change • Sleep score, sleep debt & recovery — last night's sleep plus HRV and resting heart rate from Apple Watch, telling you whether to push or recover • Presets that match real rosters — Panama 2-2-3 schedule (day/night), Pitman, DuPont, Fire 48/96, 12-hour rotating shifts, plus Korean and Japanese patterns. Or build your own custom rotation • Melatonin timing card (optional) — an informational window based on your estimated body clock. Not a recommendation to take melatonin; talk to your doctor or pharmacist first BUILT FOR SHIFT WORKERS Whether you're a night shift nurse, a firefighter on 48/96, a plant operator on a DuPont rotation, or a driver on a rotating roster — ShiftRhythm adapts to your schedule, not the other way around. • Tap any calendar day to correct that day's shift • Works from your schedule alone — no Apple Watch required • Apple Watch app and widgets included; available in English, Spanish, Korean, and Japanese PRIVATE BY DESIGN • No account. No server. Your data stays on your phone. • All circadian math runs on-device — health data never leaves your iPhone • No ads, no tracking PRICING • 30-day free trial — full features, no account needed • Then Monthly or Annual (Annual saves vs. monthly), or a one-time Lifetime purchase if you'd rather not subscribe • Subscriptions auto-renew; cancel anytime in Settings > Apple Account > Subscriptions Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://yoonspower.github.io/shiftrhythm/privacy.html ShiftRhythm is for general wellness and reference only. It is not a medical device and does not diagnose, treat, or monitor any medical condition. Values shown are estimates and may be inaccurate. Consult a professional for health concerns.

Tired of sleep apps that lock the good sounds behind a $60-a-year subscription? Quiet Sleep Sounds is the opposite: a clean, calming sound player with a one-time unlock and no recurring charges ever. Tap a sound and drift off. Layer a few together. Set a timer and let it fade out on its own. SOUNDS FOR SLEEP AND FOCUS • Brown noise — the deep, soft rumble people love for sleep and concentration, generated cleanly with no repeating loop • Rain, ocean waves, a crackling fire, a forest at night, crickets, a steady fan, a flowing stream • White, pink, and green noise BUILT FOR ACTUAL SLEEP • Sleep timer — fades out gently after 15 to 90 minutes so it never wakes you • Plays in the background with the screen locked and the phone in your pocket • Dark, quiet design that's easy on the eyes at 2 a.m. • Mix several sounds and set each one's volume to build your own soundscape NO SUBSCRIPTION. EVER. The app is free with ads. One small, optional, one-time purchase removes the ads and unlocks sound mixing — that's the whole deal. No weekly trials, no auto-renewing charges, no account, no sign-up. It even works offline. Great for falling asleep, focus and study sessions, calming a baby, blocking out noisy neighbors, or winding down after a long day. Made by a tiny indie shop. Questions? We answer every email.