SunDose
UV Tracker
UV Tracker for iPhone
One afternoon tells you very little. A month of them tells you a lot — which is why SunDose logs every session and shows you the pattern.
The short answer
A UV tracker records how much ultraviolet exposure you actually accumulate rather than just showing today’s index. SunDose logs each session with its duration and the UV conditions at the time, then reports totals, averages and higher-risk days across a 30-day view — all stored on your device.
Why track exposure at all?
Because sun exposure accumulates, and memory does not. Most people can recall the day they burned and almost nothing about the twenty ordinary afternoons around it — which together carry far more total UV.
A tracker converts a vague sense of “I have been outside a lot lately” into something you can actually look at: minutes, average index, and which days sat at the top of the scale.
What SunDose records
Every completed session is logged automatically, with the conditions attached.
- Total exposure minutes across the period.
- Average UV for the sessions you logged.
- Higher-risk days, so the outliers are visible rather than averaged away.
- A 30-day calendar of sessions and completed routine items.
- Streaks for routine consistency.
Patterns worth watching
Two are worth calling out. The first is the shoulder of the season: because the hottest weeks arrive around three weeks after the sun is at its strongest, late-summer days often feel milder than the UV justifies.
The second is the pleasant day. Scorching afternoons prompt caution on their own; mild, breezy, part-cloudy ones do not — and cloud reduces the heat far more than it reduces the UV. Those days are exactly where a log shows you something you would not otherwise notice.
Your history stays yours
Session history and your skin profile are stored on your device. There is no advertising profile built from your exposure data — see the privacy policy for specifics.
Frequently asked questions
- What does a UV tracker actually measure?
- SunDose records the duration of each logged session together with the UV index reported for your location at the time, then aggregates those into totals and averages. It is a record of reported conditions and time, not a physical dosimeter reading from your skin.
- Do I need a wearable UV sensor?
- Not for this. SunDose uses forecast UV data for your location combined with the sessions you actually run. A hardware dosimeter measures incident UV directly, which is a different and more specialised tool.
- Can I log a session I forgot to time?
- Yes. Sessions can be recorded after the fact, so a day you spent outside without starting the timer still counts toward your totals and your history.
- Is my exposure history private?
- Your skin profile and logged sessions stay on your device. SunDose does not sell profiles or track you across apps; the privacy policy sets out exactly what is and is not collected.
Read more
Sources
- World Health OrganizationRadiation: The ultraviolet (UV) index
- US Environmental Protection AgencyLearn About the UV Index
- National Weather Service, Cleveland OHThe Seasons, the Equinox, and the Solstices