Yishui
Features

See the night clearly.
That's all.

The free core is complete: unlimited recordings, basic reports, the last 7 nights, and breathing. The unlock adds long-term review and every theme.

Night records and sound clues

  • One tap: place the phone by the bed and start. A microphone explainer appears first; volume and timing are computed on device.
  • No full-night audio: no raw sound files by default. Optional clips (≤10 s each) require a per-night opt-in, capped at 100 clips / 20 MiB on device, retained 7 days with automatic cleanup.
  • Correctable clues: review the timeline, mark false positives, and statistics update instantly. Clues are volume-activity events and cannot confirm snoring.
  • Honest interruptions: after calls, a drained battery or system termination, the recovered partial record clearly marks its gaps — never presented as a full night.

Reports and suggestions

  • One headline number in the morning: time in bed; the sound summary and data sources are labeled.
  • The "one thing for tonight" suggestion states its trigger, and you can mark it helpful or not.
  • On request, Apple Health: with watch data it shows "watch-estimated sleep" beside the phone's in-bed record, never blended.

Long-term review (lifetime unlock)

  • Last 7 nights free; 30/90-day trends, complete/partial/sound filters and on-device CSV export are part of the unlock.
  • Missing nights stay blank — no zero-filling; partial records get their own color.
  • 30/90-day health comparison: your phone's capture beside the selected health source, night by night; missing nights read "not read". Health samples stay in memory only and are never exported.
  • Sleep-stage details: Core, Deep, REM, Unspecified and Awake, deduplicated per source, never inferred.

Wind down and Apple Watch

  • Two-minute breathing: pause, continue, end and restart, honoring Reduce Motion.
  • Three bilingual text-guided practices (2/3/4 minutes): "A quiet moment" is free; "Notice your body" and "Let today rest" come with the unlock. Fully offline, no audio or network permissions.
  • Apple Watch: monitoring status, a standalone two-minute breath, the morning line; purchasers can review the phone's 30/90-day summary (live phone confirmation required — a cache never unlocks). Without a watch, Yishui works in full.

Unlock and privacy

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Yishui Complete Unlock

A single non-consumable purchase: full report comparisons, 30/90-day trends and export, sleep stages, optional short clips with playback, all 8 warm themes, every text practice. No auto-renewal.

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On device first

No account, no tracking, no ad SDK; clip files use system protection and are excluded from backups; deletion is one step. Full privacy policy →

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English · 中文 · App Lock

Switch between English and Simplified Chinese in Settings; an optional Face ID / device-passcode lock shields records when you leave the app.