# Chronosync: Circadian Health

> Sunlight, sleep, and timing

Canonical page: [https://chrome-stats.com/d/id6781776422](https://chrome-stats.com/d/id6781776422)

## Overview

- **ID:** `id6781776422`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** JTR Labs LLC
- **Category:** Health & Fitness
- **Version:** 1.6
- **Last updated:** 2026-08-03
- **First published:** 2026-07-16
- **Size:** 8.11 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/chronosync-circadian-health/id6781776422)
- **Website:** [https://chronosyncplus.com](https://chronosyncplus.com/)
- **Privacy policy:** [https://chronosyncplus.com/privacy.html](https://chronosyncplus.com/privacy.html)

## Description

Chronosync Plus helps you understand your day through the light around you. Track sunrise, solar noon, sunset, UV context, estimated vitamin D exposure, sleep timing, and evening routines from one private, local-first iPhone app built around circadian awareness.

Features:
• Solar-aware daily dashboard
• Sunrise, solar noon, and sunset alarms
• Estimated vitamin D tracking based on UV, skin type, clothing coverage, and sky conditions
• UVA and UVB context with plain-language explanations
• Sun session timer with IU/min estimates, session summaries, and Live Activities
• Sleep log and chronotype-based timing tools
• Blue-blocking glasses reminders
• Solar flare and space weather context
• Native iOS Shortcuts actions
• Local-first privacy with no Chronosync account required

Subscriptions:
Chronosync Pro Monthly and Chronosync Pro Annual unlock Pro features including timeline, score, night routines, sleep log, vitamin-D estimates, solar activity context, solar alarms, and advanced sun-session tools.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://chronosyncplus.com/privacy

Important: Chronosync Plus is an educational wellness tool. It is not medical advice, not a medical device, and not a substitute for professional care. Vitamin D, UV, burn-time, and circadian outputs are estimates and may be inaccurate or incomplete.

## Rankings

- #1,554,030 — Overall

## Similar extensions and apps

- [SunSync - Circadian Tracker](https://chrome-stats.com/d/id6762293528)
- [Solar Circadian Clock](https://chrome-stats.com/d/id6739723405)
- [MyCircadianApp](https://chrome-stats.com/d/id6538168795) — 4.90 / 5
- [Sunlight & UV: Get Some Sun](https://chrome-stats.com/d/id6753917514) — 5.00 / 5
- [Circadian Time:Mood, Light,Sun](https://chrome-stats.com/d/id6761936241)
- [Circadian Rhythm Companion](https://chrome-stats.com/d/id6776765420)
- [Dawn and Dusk](https://chrome-stats.com/d/id6736839971) — 5.00 / 5
- [Daylight Goals Sunlight Timer](https://chrome-stats.com/d/id6466341899) — 4.70 / 5
- [VitalSun - Sunlight for Health](https://chrome-stats.com/d/id6762610569) — 5.00 / 5
- [Sun Exposure Time in Daylight](https://chrome-stats.com/d/id6749501952) — 3.50 / 5
- [D3-Sync: Sun & Supplements](https://chrome-stats.com/d/id6772340133)
- [SunSync: Sunscreen Reminder](https://chrome-stats.com/d/id6779470861) — 4.30 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id6781776422)