One tap before bed.
One thing worth knowing.
Place the phone by the bed. Yishui computes volume and timing on device, building a sound-clue timeline — full-night audio is never saved or uploaded. A brief report, reviewable clues, and one suggestion you can act on tonight.
Three things, stated plainly
No gimmicks, and your raw data stays yours.
Sound clues from your phone
Volume and timing only by default; full-night audio is never saved. Optional 10-second clips require your per-night opt-in and can be reviewed and deleted anytime.
Watch sleep, kept separate
Only when you ask, Yishui reads Apple Health: with Apple Watch data it shows "watch-estimated sleep" side by side with the phone's in-bed record, never blended.
One-time unlock
Full reports, 30/90-day trends and export, sleep stages, every theme and practice — buy once, keep forever. No auto-renewal, no ads.
What it does for you
No account needed. Without a watch, Yishui works in full.
Sound clues
Review the event timeline, mark false positives, and the statistics update instantly. Clues are volume activity — they cannot confirm snoring.
Brief morning report
Time in bed, a sound summary, and one actionable suggestion; sources and reasoning are always stated.
Apple Health
Sleep samples are read only on tap: sources, gaps and conflicts are explained — no guessing, no zero-filling.
Long-term review
The last 7 nights are free. 30/90-day trends, filters and on-device CSV export come with the unlock; missing nights stay blank.
Wind down
A two-minute breathing exercise and three text-guided practices (2/3/4 minutes), fully offline. One is free; two come with the unlock.
Apple Watch
Monitoring status, a standalone two-minute breath, and the morning line; purchasers can review the phone's 30/90-day summary.
Privacy is the feature
Raw audio is off by default
Optional clips use system file protection, are excluded from backups, are retained for 7 days, and are deletable anytime. No tracking, no ad SDK, no uploads; App Lock uses system Face ID/passcode. One step deletes local records without touching Apple Health. Read the full privacy policy →
Sound clues are volume-activity events; they cannot confirm snoring or any condition. Yishui is not a medical device. If you wake gasping or feel very sleepy during the day, talk to a doctor.