# SunTrack - UV tracking

> Productivity

Canonical page: [https://chrome-stats.com/d/id6776056748](https://chrome-stats.com/d/id6776056748)

## Overview

- **ID:** `id6776056748`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Removed
- **Publisher:** Toan Nong Van
- **Category:** Productivity
- **Version:** 1.0.3
- **Last updated:** 2026-06-08
- **First published:** 2026-06-08
- **Size:** 2.54 MB
- **Data as of:** 2026-06-15
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/suntrack-uv-tracking/id6776056748)
- **Website:** [https://www.termsfeed.com/live/44c288f8-a59f-47b1-b85b-dd6b1762f69b](https://www.termsfeed.com/live/44c288f8-a59f-47b1-b85b-dd6b1762f69b)
- **Privacy policy:** [https://www.termsfeed.com/live/44c288f8-a59f-47b1-b85b-dd6b1762f69b](https://www.termsfeed.com/live/44c288f8-a59f-47b1-b85b-dd6b1762f69b)

## Description

SunTrack — UV Protection Assistant

##  Overview

SunTrack is a full-featured UV (Ultraviolet) tracking iOS application that helps users understand current UV intensity, receive personalized sun protection advice, and track sun exposure time. The app uses an **offline solar position algorithm** to calculate UV index estimates — no third-party API keys required.

##  Features

###  Real-Time UV Dashboard
- Large circular UV gauge with dynamic color transitions (green → yellow → orange → red → purple)
- UV level classification: Low / Moderate / High / Very High / Extreme
- Safe exposure countdown based on your skin type
- Full-day UV forecast chart with hourly predictions
- Sunrise / sunset / solar noon times and sun elevation angle

###  Smart Sun Timer
- Start/stop exposure timer with automatic logging
- Real-time safety progress ring with color warnings
- Activity type selection (Commute, Sport, Beach, Hiking, etc.)
- SPF-adjusted safe time calculation
- Today's cumulative exposure summary

###  Exposure Log
- Calendar heatmap showing daily exposure intensity
- 7-day / 30-day exposure trends
- Activity type distribution chart
- Detailed log entries with UV dose tracking
- Swipe-to-delete record management

###  Protection Advice
- Personalized protection level based on UV index + skin type
- Dynamic recommendation checklist (sunscreen, sunglasses, hat, clothing, shade)
- Sunscreen reapply timer (configurable interval)
- UV health facts and educational cards

###  Settings
- Fitzpatrick skin type selection (Type I–VI) with visual color display
- Default SPF value configuration
- Sunscreen reapply interval setting
- Optional OpenUV API key for enhanced real-time data
- Data management (export / reset)

##  Technical Highlights

### Offline UV Calculation Engine

Since Apple's WeatherKit requires iOS 16+, SunTrack implements a **solar elevation angle algorithm** for fully offline UV index estimation:

```
UV_estimated = 12.0 × sin(solar_elevation)^1.3 × altitude_factor × ozone_factor

Where:
  solar_elevation = f(latitude, longitude, date, time)  // Astronomical calculation
  altitude_factor = 1 + 0.06 × altitude_km
  ozone_factor ≈ 0.9 (global average)
```

**Accuracy:** ±1–2 UV index under clear-sky conditions.

### Fitzpatrick Safe Exposure Formula

Personalized burn time calculation based on the internationally recognized Fitzpatrick scale:

```
Safe Time (minutes) = (200 × skin_multiplier) / (3 × UV_index)

Skin Multipliers:
  Type I   → 2.5   (Very fair, always burns)
  Type II  → 3.0   (Fair, burns easily)
  Type III → 4.0   (Medium, sometimes burns)
  Type IV  → 5.0   (Olive, rarely burns)
  Type V   → 8.0   (Brown, very rarely burns)
  Type VI  → 15.0  (Dark brown/black, never burns)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6776056748)