Know Your Lemons - Self Exam

Know Your Lemons Foundation

About this app

Know Your Lemons is the world’s leading app designed to improve early detection of breast cancer. It supports users with guided breast self-exams, monthly reminders timed to their breast cycle, risk assessments, personalized screening plans, and clear education on risk factors, signs, and symptoms. The app also helps users prepare for mammograms and navigate next steps when something feels wrong, reducing confusion, fear, and delays in care.

Built using inclusive, visually engaging design, Know Your Lemons makes breast health education accessible across ages, cultures, and health literacy levels. It is the world’s first app created specifically to improve early detection of breast cancer and the only period-related health app ever nominated for a Webby Award, winning Best Health and Fitness App in 2025.

Beyond individual use, Know Your Lemons also offers an optional workplace benefit through Know Your Lemons at Work. Employers can provide employees and their dependents with access to personalized risk assessment, screening navigation, symptom education, and diagnosis support through the same trusted app. This benefit is designed to be easy to launch, inclusive, and scalable, helping employers support early detection at no additional cost when funded through insurer health promotion budgets.

Know Your Lemons combines design, technology, and evidence-based education to help people notice changes earlier, saving lives.

Ratings and reviews

So so important to have something to remind us to do this vital self screening. Love that it has all the information you need to know on how to do it and resources in case you find something all in one place. And I love the reminders for the self exams...my sister is currently battling breast cancer STILL forget all the time! I've sent the app to all of my friends and family. I don't want to ever have to watch anyone have to fight this again.

Simple and helpful app all around! Like most other folks I plan to do the monthly checks yet somehow, it never happens. Since I got the app, I've been checking every month without fail! Plus! I had always known to check for lumps but never understood exactly what to look for - their use of lemons to give a "real life" example of what to feel (and look) for has made me feel very confident with my checks as there's no more second-guessing from me.

they keep responding to people saying that the email login works fine but IT DOESNT. I was trying to find a good app to give me a tutorial on giving yourself a breast exam, but it's impossible to even create an account. no matter what, it will say that the password is too vulnerable (EVEN IF ITS A PARAGRAPH LONG). this is driving me absolutely up the wall. good idea, terrible execution.

What’s new

We’ve added badges for self-exams and completing quizzes to make tracking your breast health even more engaging. Also added new features for the Know Your Lemons At Work section, including genetic counseling, genetic testing, and genomic testing services.