SunUp by GearTOP is a free iOS app that combines real-time UV monitoring, personalized sun safety calculations, air quality tracking, and a comprehensive 20+ topic in-app Sun Safety Guide into one complete outdoor safety tool.
This is the complete guide to everything SunUp does — every feature, how to use it, and why it matters.
Quick Answer: SunUp is a free iOS UV safety app that combines real-time UV index (GPS-based, updated every 15 minutes), personalized burn time calculations by Fitzpatrick skin type (I–VI), Air Quality Index monitoring, 48-hour UV forecast, and UV checks for family members — all in one app. It turns the UV number into a specific, personalized recommendation, not just a data point.
What Makes SunUp Different
Most UV apps give you a number. UV index is 7 today. That's it.
SunUp gives you a decision.
The difference is personalization. A UV index of 7 means something completely different to a pale, fair-skinned redhead (Type I) than to someone with naturally dark skin (Type V). It means something different at 10 AM versus 1 PM. It means something different for a leisurely walk versus three hours of beach volleyball.
SunUp combines all of these factors to give you a genuinely useful recommendation: approximately how long you can safely be outside, what protection you need, when UV peaks today, and when to reapply.
That's what no basic weather app or UV widget can do.
Core Feature 1: Real-Time UV Index
What it does: Displays the current UV index for your exact GPS location, updated every 15 minutes from OpenWeatherMap data.
What you see: A large numerical UV index on the main dashboard, color-coded to WHO UV risk categories:
- 0–2: Green (Low)
- 3–5: Yellow (Moderate)
- 6–7: Orange (High)
- 8–10: Red (Very High)
- 11+: Purple (Extreme)
Why it matters: UV varies significantly by location — even a few kilometers can differ due to cloud patterns and local conditions. The app uses your GPS to pull the most accurate data for where you actually are, not a regional average.
Core Feature 2: Personalized Burn Time Calculator
What it does: Uses your Fitzpatrick skin type (I–VI), current UV index, planned activity, and duration to calculate your personalized safe time outdoors before UV exposure becomes a risk.
What you see: "You can be outside safely for approximately X minutes at current UV levels." With color-coded urgency based on your skin type and current UV.
The science: The Fitzpatrick scale classifies skin sensitivity from Type I (very fair, always burns) through Type VI (very dark, rarely burns). A Type I person at UV 8 has approximately 10–15 minutes before risk increases. A Type V person has 60–90 minutes. Generic advice ignores this completely.
How to set your skin type: Open Profile → Skin Type → select your type using the visual guide with descriptions. Takes 30 seconds.
Core Feature 3: 48-Hour UV Forecast
What it does: Shows a visual forecast curve of predicted UV intensity for the next 48 hours, with hourly granularity.
What you see: A line graph showing UV index by hour. You can see exactly when UV peaks today, when it drops to safe levels, and what tomorrow looks like.
Why it matters: Planning a hike for tomorrow? The forecast shows whether tomorrow's UV peaks at 8 or at 11 — a massive difference for a 5-hour trail run. You can plan your start time to be off exposed terrain before UV hits peak.
The peak UV window: SunUp highlights the peak UV window (typically 10 AM–2 PM) for your location and date, so you know exactly when to seek shade.
Core Feature 4: Activity-Specific Guidance
What it does: Adjusts UV exposure calculations based on 12+ activities, each with different exposure multipliers and protection recommendations.
Activities included: Hiking, Trail Running, Beach/Swimming, Cycling, Golf, Gardening, Skiing/Snowboarding, Outdoor Work, Water Sports, Picnicking, Kids' Outdoor Play, Spectator Sports.
Why activities matter: Swimming degrades sunscreen faster than gardening. Skiing adds altitude UV plus snow reflection. A cyclist's face and neck are in a different angle to the sun than a hiker's. Each activity has genuinely different UV exposure patterns.
What you see for each activity: Personalized safe time, recommended SPF, notes on activity-specific risks (e.g., "water reflects UV — apply water-resistant SPF and reapply after swimming").
Core Feature 5: Air Quality (AQI) Monitoring
What it does: Displays real-time Air Quality Index alongside UV data, including the main pollutant and health guidance.
What you see: The current AQI number and category (Good/Moderate/Unhealthy) on the dashboard. The main pollutant driving the AQI. Specific recommendations based on your profile.
The integration advantage: UV and air quality interact, especially during wildfire events. Smoke reduces UV but creates serious respiratory risk. SunUp shows both so you can make a complete outdoor safety decision — not just optimize for one variable.
Wildfire alerts: On high-smoke days, SunUp surfaces specific guidance for wildfire smoke AQI, including mask recommendations and activity modification.
Core Feature 6: Check UV for Someone Else
What it does: Lets you run a complete personalized UV safety check for any other person — your child, partner, parent, friend, or neighbor — using their details, not yours.
What you see: From the Activity Planner, tap "Plan for Someone Else." Enter their name, age, gender, and Fitzpatrick skin type, plus a location (your current location or search by city or address). SunUp calculates their specific safe exposure time based on their biology.
Why age matters: Children's skin is more UV-sensitive than adult skin, and SunUp adjusts recommendations accordingly. A 7-year-old at the same UV index as an adult gets more conservative recommendations — and this applies whether you're checking for your own child or someone else's.
How it works: This is a one-time check per person — you enter their details each time. Saved persistent family profiles (where each person's info is stored permanently) are coming in a future update. The feature is perfect for checking UV conditions for someone in a different city: your child at summer camp, your parents in Florida, a friend traveling to a high-UV destination.
Core Feature 7: 230+ Smart Tips
What it does: Delivers personalized sun safety tips based on your skin type, current UV conditions, planned activity, and time of year.
What you see: A tip card on the main dashboard and in the Tips section. Tips are contextually relevant — if it's a high-UV beach day, you'll see beach-specific UV advice, not generic information.
Categories covered: Sunscreen application, protective clothing, activity-specific guidance, age-specific advice (children, elderly), medical conditions and UV, vitamin D, UV + medication interactions, and more.
Personalization: The 230+ tip library is filtered by your profile. A Type I person sees different tips than a Type V person. A hiker sees different tips than a gardener.
Core Feature 8: GearTOP Gear Recommendations
What it does: Contextually recommends UV-protective gear products from GearTOP based on your activity, UV conditions, and protection gaps.
What you see: When UV is high and you're planning a hike, the app surfaces relevant GearTOP product recommendations — the Navigator sun hat, UPF 50+ gloves, or other relevant protective gear.
Why this is useful: SunUp doesn't just tell you to protect yourself — it tells you what to use. Recommendations link directly to GearTOP product pages with details on UPF rating and coverage.
Core Feature 9: UV Exposure History Tracking
What it does: Logs your UV exposure sessions (time outdoors, UV index, activity type) so you can track cumulative exposure over time.
What you see: A history log with exposure sessions, total UV dose by week and month, and trend visualizations.
Why it matters: UV damage is cumulative. It's useful to understand your seasonal exposure patterns and whether you're in the high or low end of your historical range.
Core Feature 10: Push Notifications & Reapplication Reminders
What it does: Sends notifications for:
- High UV alerts (UV index exceeds your threshold)
- Sunscreen reapplication reminders during outdoor sessions
- Air quality alerts when AQI deteriorates
- Daily UV forecast summaries
Setup: Notifications → enable the types you want → set thresholds. You can fine-tune each notification type independently.
Reapplication reminder: Set when you apply sunscreen, and SunUp calculates when you should reapply based on your activity type (water activities trigger an earlier reapplication reminder than low-activity ones).
Core Feature 11: In-App Sun Safety Guide Library
What it does: A comprehensive 20+ topic educational library built directly into the app, covering UV science, skin protection methods, first aid, Vitamin D balance, age-specific guidance, and more.
What you see: A structured guide organized into four major sections: Sun Safety Essentials (Why Sun Protection, UV Index, Fitzpatrick Scale, Age & Gender), Protection Methods (Sunscreen, Protective Clothing, Shadow Rule, Eye Health), Health & First Aid (Medications & UV Sensitivity, Vitamin D Balance, Special Conditions), and Science & Environment (Air Quality, Seasonal Safety, UV Science).
Why it matters: Most UV apps surface a number and nothing more. The SunUp Guide is a complete skin health reference — written in plain language, organized for real-world use, and available offline. It covers topics most people never look up until they need them: drug-induced photosensitivity (antibiotics, statins, diuretics), UV and autoimmune conditions, how to build a sun-safe routine, and the science behind how UV damages DNA. The American Academy of Dermatology's sun protection guidelines inform much of the foundational content.
Who it's for: Anyone who wants to go beyond the UV number and actually understand their skin health. Particularly useful for parents learning about children's UV sensitivity, seniors managing medications, and outdoor workers planning long sun-exposed days.
Is SunUp Really Free?
Yes. SunUp is currently free for all users with lifetime access — meaning every feature described in this article is included at no cost.
SunUp operates on an early adopter model: current users lock in free access permanently. Future new users may be charged a subscription fee after paid plans launch. If you download SunUp today, you're grandfathered into free access for life.
No credit card required, no free trial that expires, no premium tier. Everything described in this guide is available from the moment you download.
Download SunUp
SunUp is available free on the iOS App Store for iPhone and iPad. Android is in development.
Every feature above — real-time UV, personalized calculations, Check UV for Someone Else, AQI monitoring, 230+ tips, history tracking, push notifications, and the 20+ topic Sun Safety Guide — is included in the free download.
Download now and lock in your lifetime free access before paid plans launch.
FAQ
Is SunUp available for Android?
Not yet. SunUp is currently available for iOS (iPhone and iPad). Android is in development. If you download the iOS version now, you lock in lifetime free access before paid plans launch.
How accurate is SunUp's UV index?
SunUp uses real-time UV data from OpenWeatherMap, updated every 15 minutes for your GPS location. This is comparable to the data powering most commercial weather apps. The UV index shown is specific to your location — not a regional average — giving you a more accurate reading than a generic city-level forecast, especially if you're at a different elevation or microclimate.
What's the difference between SunUp and a weather app's UV index?
Weather apps display a static UV number with no personalization or decision support. SunUp uses the UV index as the starting point, then layers your Fitzpatrick skin type, planned activity, duration, and air quality to give you a specific safe-time recommendation. It also tracks exposure over time, sends reapplication reminders, and provides personalized UV checks for family members. The UV number is where weather apps stop. It's where SunUp starts.
How does SunUp handle multiple family members?
The "Plan for Someone Else" feature lets you run a complete UV check for any family member by entering their skin type, age, and gender. You can check UV conditions for each person individually in the same session. Saved persistent family profiles — where each person's details are stored permanently — are coming in a future update.
How does SunUp's burn time calculation work?
SunUp combines your Fitzpatrick skin type (which determines your baseline UV sensitivity), the current UV index at your GPS location, your planned activity type (which has different exposure multipliers — swimming, hiking, and sitting in a park have meaningfully different UV exposure patterns), and your planned duration. The result is a personalized estimate of safe time before UV exposure becomes a risk for your specific skin. The calculation is recalculated in real time as UV conditions change through the day.
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