About KnowDrugs

Making drug checking results accessible – empowering people who use drugs to take informed decisions.


Hi there!

My name is Philipp, I’m a Designer and former Social Worker and I founded KnowDrugs in 2016.

My app supports outreach workers and people who use drugs, by informing about recent pill warnings, providing information on psychoactive substance and how to reduce their harms. 

People who decide to use drugs – despite their risks – are encouraged to research effects, interactions and dosage ranges of psychoactive substances before consuming them.


Enable people who decided to take drugs to make informed decisions and help them reduce the harms associated with drugs.

The Why


An inclusive society where all voices are heard, people are treated with dignity and have equitable opportunities regardless of their choice to use drugs.

Our Story

How We Got Started

The absence of drug checking programmes in Germany, and the inefficiency of pill warning printouts, I started researching about the problems and needs of people using drugs in recreational settings.

My background in Social Work and my experience as a human-centered Designer helped me to bring things together. I explored how I could make honest and objective information about drugs available and accessible – in situations when people need them the most: At parties, festivals and on-the-go.

Where We Are Now

Since it’s launch in mid-2016, the KnowDrugs App has been downloaded more than 200.000 times. It is being used by people from almost every country in the world.

Constantly learning from users and harm-reduction workers from the field, I am trying to improve the way KnowDrugs helps users take informed decisions and eventually reduce some of the harms of drugs.

KnowDrugs is a non-profit

This project receives no government funding and relies on donations.
You can support my work for as little as €10.


Support my Work

Making harm-reduction advice accessible

Drug Checking Results

Drug Profiles