Enjoy Peace of Mind in the Sun

The day tattoo that signals when you’ve had enough sun for the day

Buy LogicInk - $3
Buy LogicInk - $3
Order LogicInk - $3
Buy LogicInk - $3
Buy LogicInk — $5
Buy LogicInk – $3

Helps You Stay within Daily Recommended UV Limits*

Applied to your skin like a temporary tattoo, LogicInk shows the irreversible accumulation of UV on your skin by changing its color. 

* based on the data from World Health Organization.



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Order LogicInk

Order 2 LogicInk day tattoos for $5, or subscribe to receive 20 for $19 a month to help protect your skin –cancel at any time.

One time purchase —

Or, subscribe —

Order now 2 LogicInk day tattoos for $5, or subscribe to receive 20 for $19 a month to help protect your skin –cancel at any time.

Starter Kit (one time) —

Or, Sun Smart Set (monthly) —

Order 2 LogicInk day tattoos for $5, or subscribe to receive 20 for $19 a month to help protect your skin –cancel at any time.

One Time Purchase —

Or, Subscribe —

Order now 2 LogicInk day tattoos for $5, or subscribe to receive 20 for $19 a month to help protect your skin –cancel at any time.

One Time Purchase —

Or, Subscribe —

Buy 2 LogicInk temporary wearables for $3, or subscribe 20 for $19 a month to help protect your skin. You can cancel at any time.

Single Purchase —

Or, Subscribe 20 Monthly —

Take advantage of this introductory offer and order 2 LogicInk Day Tattoos for $3.

Let LogicInk alert you when you've had enough sun for the day –cancel at anytime.



“Vital for Your Skin All Year Round”

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"The tanning of your skin from UV rays is a sign of skin damage and it is never safe. Tanning is your body’s response to try to prevent further damage by increasing the production of melanin. Skin damage from UV rays is a key factor in the premature aging of your skin, and it increases your risk of skin cancer."

— Larry Weiss, M.D.

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"Sun protection is my no.1 skincare strategy."

— Debbie, Sales Director
Los Altos, CA


"Using LogicInk on my children gave me peace of mind while they were playing outside"

— Karen, Mom of three
Saratoga, CA


"The best part is that it is waterproof"

— Nino, Surfer
San Francisco, CA

Watch LogicInk in action


A wearable for your skin

Use LogicInk as an "early warning" reminder to protect your skin, year-round and even on cloudy days.

How it works

Distinctively designed, comprehensive indication of your UV exposure.



Available in two designs: circles and bar, with more to come.

The outer circle and bar turn fully pink when you reach the daily UV limit for sensitive skin, based on data from the World Health Organization. 

The inner circle and dot show the current UV exposure in real-time.

Frequently Asked Questions


How do I know when I've had enough sun for the day?

LogicInk is formulated to help people with sensitive or fair skin stay within safe UV limits as defined by the World Health Organization. If your skin burns easily, you’ll want to re-apply sunscreen, cover up or find shade before the last segment turns completely pink.

But people of all skin types can be harmed by too much UV exposure. LogicInk helps everyone remember to take action to prevent skin damage.


How long does LogicInk last?

LogicInk is designed to measure the cumulative effect of one day in the sun.

We do not recommend you use it a second day.


Is LogicInk UV safe for children?

Yes! LogicInk is a great way to ensure your children aren’t getting too much sun. The easy-to-read design clearly reminds you it’s time to apply more sunscreen, cover up or give your kids a break from the sun.

Use LogicInk and help minimize the cumulative effects of sun exposure that start in childhood.


Is LogicInk UV waterproof?

Yes! LogicInk's adhesive is gentle on your skin yet resilient enough to last in the water.

LogicInk is for people of all ages and lifestyles.


Is LogicInk UV compatible with my sunscreen?

We recommend you apply LogicInk on clean, dry skin, then apply sunscreen over your skin and on LogicInk.

By design, sunscreen will expire faster from LogicInk's surface than it does on your skin, functioning as a helpful early warning to take action: re-apply sunscreen, seek shade, or cover up.


How can a smartphone enhance the LogicInk experience?

Unlike similar electronic-based products, LogicInk does not require a smartphone to know if you had enough sun for the day. LogicInk is thoughtfully designed with clear changing shapes and bold colors so you can see your UV status with just a glance.

An optional mobile app lets you scan your LogicInk "tattoo" –e.g. at the end of the day– to track UV exposure patterns over longer periods of time, among other services to come.


The Future of Wearables

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Powered by programmable chemistry and biology, we envision a future where LogicInk wearables seamlessly integrate into your daily life, enabling health awareness and self-expression.



Carlos Olguin
MSc Information Networking
Carnegie Mellon

Steven Wrobel
BSc Chemistry
UC Berkeley

Amy Friel
U of Michigan

Peter Foller
PhD Chemistry
UC Berkeley

Tal Danino
PhD Bioengineering
UC San Diego

Claire Le Maitre
BSc Chemistry
UC Los Angeles

Kari Workman
BFA U of Montana

E Roon Kang
MFA Graphic Design
Yale University

Skylar Tibbits
SM Computer Science & Design Computation, MIT

Marcelo Coelho
PhD, MIT Media Lab

George Church
PhD Biochem. & Mol. Biology
Harvard University

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