Getting a beautiful, even tan should involve more than guesswork. SunTanApp is a user-friendly tool that helps you plan and track tanning sessions with UV-based exposure estimates, body-position reminders, and sunscreen timing prompts.
SunTanApp helps you stay more aware of your estimated sun exposure in real time using UV analysis, selected skin profile settings, and personalized session guidance.
All this happens behind the scenes — you just get clear, friendly prompts like:
Because sun exposure is more complicated than a stopwatch.
Different body regions may respond to UV exposure differently. Your arms and face may tan quickly, while your legs or back may need more time. UV levels can also vary by cloud cover, altitude, humidity, pollution, time of year, and environmental reflectivity.
SunTanApp brings those factors into one simple tanning-session planner.
SunTanApp is designed to help you build more informed tanning habits while staying aware of overexposure risk.
Instead of pushing you toward high-exposure limits, SunTanApp estimates a personalized session target based on selected profile settings, UV conditions, and your recent tanning history.
The goal is to help you manage intentional sun sessions more carefully, rotate more evenly, and avoid relying on guesswork during changing UV conditions.
These selected profile settings can affect how the app estimates your session guidance:
We use these settings to personalize your sun-session plan, rather than applying the same timing logic to every user.
We model factors such as sun angle, UV intensity, body position, and estimated pigmentation changes so you do not have to track everything manually. What could otherwise require a spreadsheet, UV meter, and constant checking is simplified into a session timer with intelligent reminders.
You focus on enjoying your time outside — SunTanApp helps track the session details.
SunTanApp provides informational UV-exposure estimates to help users stay aware of time spent in the sun. It is not a medical device and does not diagnose, treat, prevent, or guarantee avoidance of sunburn, skin damage, skin cancer, vitamin D deficiency, or any other medical condition.
Exposure estimates are approximate and are based on user-selected profile settings, current UV conditions, sunscreen and SPF settings, sky-condition adjustments, body-position tracking, and elapsed session time. Actual UV exposure and skin response can vary based on many factors, including location accuracy, weather changes, altitude, reflection from water, sand, snow, or pavement, sweating, swimming, sunscreen application amount, sunscreen age, medications, medical conditions, photosensitivity, and individual skin sensitivity.
SunTanApp is intended to support awareness and planning, not to replace sunscreen directions, professional medical advice, or common-sense sun protection. Users should follow the directions on sunscreen products, reapply sunscreen as directed, seek shade, wear protective clothing, and consult a qualified healthcare professional with questions about UV exposure, sunburn, photosensitivity, skin cancer risk, vitamin D, or skin conditions.
SunTanApp uses UV Index information as the starting point for estimating sun exposure. The UV Index is a standardized public-health measure of ultraviolet radiation at the Earth’s surface and the potential for skin damage. SunTanApp combines this UV information with session duration, selected skin profile, sunscreen settings, sky conditions, and body-position tracking to estimate relative exposure during a tanning session.
The app’s TDU system is an internal exposure-tracking model designed to make changing UV intensity easier to understand during a session. TDU values should be treated as estimates for awareness and comparison, not as precise medical measurements or guarantees of safety.
UV exposure can stress the outermost skin cells even when you do not notice obvious redness. This may accelerate your skin’s natural turnover, especially after long or intense sessions. Peeling does not always mean you had a visible sunburn, but it can still be a sign that your skin experienced meaningful UV stress. Hydration, moisturizers, sunscreen use, session length, and rotation technique can all affect how your skin feels after sun exposure.
SunTanApp uses a personalized pigmentation tracking system that estimates your skin’s response to UV exposure over time. We do not just count minutes in the sun — we track Tan Dose Units (TDU), which estimate relative melanogenic stimulus based on UV intensity, duration, and selected skin profile settings.
We calculate a base tan level from 0% to 100% to represent your estimated current pigmentation compared to your selected skin profile’s modeled tanning potential. This is not a medical measurement or diagnosis; it is an internal estimate based on published research and the app’s exposure-tracking model.
The app uses your estimated current base tan to adjust recommended TDU for each session. For example, when you are just starting out, lower-TDU sessions may be enough to create a tanning response. As your tan develops, the app may estimate that different session targets are appropriate. The algorithm is designed to target tanning progression and maintenance without intentionally pushing exposure estimates toward high-risk levels.
Once your tan reaches 80–90%, you are in what we call the maintenance phase. You may:
Our system tapers recommendations automatically, helping you manage maintenance sessions more conservatively while staying aware of UV exposure.
SunTanApp was designed by Jason Reskin at Unistellar Industries, LLC. The app was developed to combine UV science, skin response modeling, and intelligent exposure tracking into a simple, user-friendly tanning assistant.
SunTanApp is a property of Unistellar Industries, LLC.