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App Store Apps > Health & Fitness > NightRing
NightRing icon

NightRing

by Hiroyuki Kako · Health & Fitness · Free
On the App Store since July 2026 · Data updated 2026-10-21

NightRing is made and published by Hiroyuki Kako. AppBrain is an independent app data site and isn't affiliated with Hiroyuki Kako. The app name, icon, screenshots and description belong to Hiroyuki Kako and are shown as published on the App Store.

AppBrain's verdict

Last updated
August 27, 2026
Size
5.47 MB
Official page on the App Store

User feedback

Ratings and reviews on the App Store

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Store listing

By Hiroyuki Kako, from the App Store
NightRing Screenshot 1 of 6
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Screenshots by Hiroyuki Kako, from the the App Store listing
Description by Hiroyuki Kako Written by the developer, not by AppBrain. Click to read.
"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.
Official page on the App Store

Safety and technology

Found in the app by AppBrain
Price
Free
App size
5.47 MB
Content rating
Everyone

Technologies used by NightRing

Releases

Updates seen on the App Store
Version
2.0
Launched
July 2026

No changelog data

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Rankings

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About the app and developer

About NightRing

NightRing is a health & fitness app developed by Hiroyuki Kako.

User Ratings

The app has no ratings yet.

App Information

NightRing is freely available from the App Store. The app size is 5.47 MB. The latest version available is 2.0. The last update was on August 27, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since July 2026.

Developer information for Hiroyuki Kako

Hiroyuki Kako

Address:

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