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At-A-Glance Protection SunFly is developing UV-sensitive and color-changing inks that monitor your skin’s UV exposure in realtime. 1 in 5 Americans will develop skin cancer. Natural and artificial ultraviolet (UV) light increases your risk for all forms of skin cancer. Protecting your skin from UV radiation is not just for your health. About 90% of all of the age-related changes you see in your skin are also caused by too much UV. prev next Mother and daughter smiling on a sunny beach

What We Do

SunFly UV Indicator Stamps

SunFly has developed a photochromic (UV-sensitive color-changing) ink that helps sunscreen users apply and reapply the right amount of sunscreen at the right time. Our ink works across all sunscreen formats (lotions, sprays, sticks, gels, mousses, oils, etc.) and every type of SPF active ingredient (mineral, chemical and hybrid).

Research shows sunscreen users should apply about 3.5x more sunscreen than they do, and they don’t reapply often enough.1 100% of sunburns2, ~90% of skin cancers3 and ~90% of skin aging4 are caused by overexposure to UV.

SunFly Stand-Alone UV Indicator Stamp

SunFly is developing a Stand-Alone UV Indicator Stamp that will work with any SPF-rated sunscreen.

CAD rendering
CAD rendering

SunFly’s Stamp-In-Cap

SunFly’s utility-patented Stamp-In-Cap design builds our tech into the sunscreen’s cap. Not only is this more convenient for the user, but it can drive sunscreen consumption up to 6.6x for our licensing partners.

How It Works

Simply stamp your skin with the SunFly UV Indicator Stamp and apply sunscreen over the stamp and the rest of your exposed skin.  If the photochromic ink is clear, you have applied enough sunscreen.  If it begins to change color, your sunscreen is no longer providing optimal protection and you should reapply.5  Our inks are engineered to last an entire day in wet or dry conditions, work with any sunscreen, and are easily removed at the end of the day.

1. SunFly Brands, Inc., “Sunscreen Application Meta-Analysis,” August 2026.
2. Mayo Clinic, “Sunburn: Symptoms and Causes,” June 7, 2024.
3. The Skin Cancer Foundation, “Skin Cancer Facts & Statistics,” March 2026 (about 90% of nonmelanoma skin cancers: Koh et al., Archives of Dermatology, 1996; 91% of U.S. melanomas: Islami et al., International Journal of Cancer, 2020).
4. The Skin Cancer Foundation, “Great Skin Is Made in the Shade,” November 4, 2021.
5. The SunFly UV Indicator Stamp is a visual reminder only and does not provide protection against UV radiation. Always follow the specific “Directions for Use” provided on your sunscreen’s packaging. If the indicator changes color before the reapplication time suggested on your sunscreen label, reapply immediately. This product is intended to promote sun-safe behaviors such as reminding users to apply/reapply sunscreen or avoid direct sunlight, which, as part of a healthy lifestyle, may help reduce the risk of skin cancer and early skin aging.