# Kairos: Daily Rhythm Planner — Peak performance, every hour

> Peak performance, every hour (iPhone/iPad app by Kenichiro Sakamoto.)

- Source: https://appshunter.io/ios/app/kairos-daily-rhythm-planner/id6759920668 (this page in markdown: same URL + `.md`)
- Developer: [Kenichiro Sakamoto](https://appshunter.io/developer/1880329270)
- Category: Productivity, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 14.0 · 36 MB
- Languages: American English
- Released: 2026-03-28
- Data updated: 2026-06-27
- User reviews in markdown: https://appshunter.io/ios/app/kairos-daily-rhythm-planner/id6759920668/reviews.md

## What is Kairos?

What if you knew exactly when to work, rest, and perform at your peak?

YOUR CIRCADIAN ADVANTAGE
Your brain, body, and energy follow predictable 24-hour cycles. Research shows cognitive peak is mid-morning, creative flow rises in late morning, and physical peak hits mid-afternoon. Kairos makes this science actionable.

6 ACTIVITY WINDOWS
See your optimal hours for:
• Focus — deep work and problem-solving
• Wellness — exercise and physical performance
• Creativity — brainstorming and creative flow
• Social — communication and collaboration
• Finance — decision-making and strategy
• Relationships — emotional connection

HOURLY PEAK GUIDE
The Timing tab shows a science-backed schedule for all 24 hours — each slot backed by published research on circadian biology, cortisol cycles, melatonin timing, and ultradian rhythms.

THE SCIENCE BEHIND IT
Built on research by Till Roenneberg, Russell Foster, and Matthew Walker. Each recommendation cites the specific biological mechanism driving it — not guesswork, not superstition.

PERSONALIZED TO YOU
Enter your birth date to calibrate your chronotype (morning lark or night owl). Kairos adjusts your peak windows to match your natural rhythm.

DAILY STREAK
Track your daily planning streak and history to see how your energy patterns evolve over time.

17 LANGUAGES SUPPORTED
English, Japanese, Chinese, Korean, Spanish, French, German, and more.

Work with your biology, not against it.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://appdevelopsk.github.io/privacy-policies/kairos/


## Version history (last 2 releases)

### 1.2.5 — 2026-03-31

Fixed an issue where the "Remove Ads" in-app purchase button would appear to load indefinitely. Added timeout handling to improve reliability of the purchase flow.

### 1.2.4 — 2026-03-28

No release notes.

## More apps by Kenichiro Sakamoto

- [Now Snap](https://appshunter.io/ios/app/now-snap/id6759716086)
- [PantryAI Recipes](https://appshunter.io/ios/app/pantryai-recipes/id6759717064)
- [Nodo Puzzle](https://appshunter.io/ios/app/nodo-puzzle/id6759717117)
- [TAKE SIDES](https://appshunter.io/ios/app/take-sides/id6759717447)
- [30sec Challenge](https://appshunter.io/ios/app/30sec-challenge/id6759761420)
- [Chaos: Daily Missions](https://appshunter.io/ios/app/chaos-daily-missions/id6759761978)

All apps by Kenichiro Sakamoto: https://appshunter.io/developer/1880329270

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-27.*