NightRing
Hiroyuki Kako Health & Fitness iPhoneiPadiPod touch
NightRing is a free Health & Fitness app for iPhone and iPad by Hiroyuki Kako. Requires iOS 17.0. Updated August 27, 2026.
- Price
- Free
- on the App Store
- Size
- 5 MB
- Age 4+
- Updated
- Aug 27
- 2026 · v2.0
Screenshots
About NightRing
"When did I fall asleep last night?" — NightDial answers the moment you open it. It reads the sleep data your Apple Watch or iPhone already saves to Health, and draws each night as an arc on a 24-hour dial. Zero input required. Just sleep like you always do. ■ Sleep Rings Sleep that crosses midnight stays whole on a circle. Bedtime to wake-up, one arc, one glance. ■ A calendar of rings One ring per day, a month at a time. Aligned arcs mean a steady rhythm — the messy nights stand out instantly. ■ Sleep Score Duration, rhythm, continuity, and timing — scored every morning, with the full breakdown visible. You'll know exactly what to fix. ■ Today's Note One piece of advice a day, picked for your recent sleep pattern from thousands of pre-written insights. ■ Night Vitals (Apple Watch) Heart rate, respiratory rate, blood oxygen and more, shown alongside each night. ■ Social Jet Lag See exactly how far your weekends drift from your weekdays — in minutes. Now you know why Mondays hurt. ■ Privacy Your sleep data is processed entirely on your device and never leaves it. ―――――――――― NightDial Plus (subscription) ―――――――――― The free version fully covers your last 14 days, plus today's score and advice. With Plus you get: - Your entire history, as far back as it goes - Trend charts: bedtime, wake time, score, nightly heart rate - Detailed weekday vs. weekend analysis - No ads Pricing: $0.99/month, $6.99/year (with 7-day free trial), or $16.99 lifetime. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kakovail.info/privacy/ * Requires sleep data in Apple Health (from Apple Watch, or iPhone with a sleep schedule). * NightDial shows rhythm insights only and does not provide medical evaluation or advice.
What’s new
Version 2.0 · Updated August 27, 2026
A complete visual redesign—quieter and easier on the eyes for an app you open at night. You can now switch the language and theme (Light/Dark) in Settings.
App privacy
The developer, Hiroyuki Kako, reported these privacy practices to Apple.
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Usage Data: Advertising Data
Used for: Third-Party Advertising, Developer’s Advertising or Marketing
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| NightRing | – | Free | August 27, 2026 | |
| Mind Cup: See Your Stress | – | Free | Jun 29, 2026 | Compare |
| おくすりもういいかい | – | Free | Jun 27, 2026 | Compare |
| Workout Log KINNIK: AI Advisor | 5.0 / 5 (1) | Free | Aug 25, 2026 | Compare |
| Simple Headache Log | 1.5 / 5 (2) | Free | Oct 2, 2025 | Compare |
| Smoke Logs | – | Free | Dec 13, 2025 | Compare |
| Steppin: Steps for Screen Time | 4.5 / 5 (156) | Free | Oct 27, 2026 | Compare |
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