About Drink Buddy
Drink Buddy is a free Android app that logs your drinks and estimates your blood alcohol content in real time — built to be simple, private, and useful on a night out, not a data-collection exercise.
Why we built it
Most drink-tracking apps ask you to create an account, sync to the cloud, or hand over more personal data than the job requires. Drink Buddy does the opposite. It uses the Widmark formula — the same method used in medical and legal contexts — to give you a real-time BAC estimate and sobriety timer from just your weight and biological sex, logged drink by drink as the night goes on.
No sign-up. No cloud sync. Nothing to configure before you can use it.
Privacy by design
All of your data — drink logs, weight, preferences — stays on your device. There's no account because there's no server to have an account with. See our Privacy Policy for the full detail on what the app stores and why.
Responsible drinking, not around it
Drink Buddy is intended for adults aged 18 and over. It's a tracking tool, not a product that promotes alcohol consumption — the goal is to help you know your numbers, not to encourage drinking more of anything. The guides on this site follow the same approach: practical, evidence-based information on standard drinks, BAC and hangovers, sourced from bodies like the NHMRC, NIAAA and healthdirect, with a consistent reminder that if you're driving, the only safe number is zero.
Editorial standards
The guides on this site are written by the Trendy Publishing editorial team. Each one is researched from government health and transport agencies, peer-reviewed studies and established health organisations, and every guide lists the sources it relies on at the end of the page. Drafts are prepared with the help of AI writing tools and checked against those sources before they're published.
The guides are general information, not medical, legal or travel advice. Drink-driving limits, health guidelines and laws change, so we date each guide and update it when the underlying source changes. If something you read here doesn't match your situation, talk to your doctor or pharmacist or check with the relevant authority.
Spotted an error? Let us know through the contact details on our Google Play listing and we'll correct it.
Who's behind it
Drink Buddy is made by Trendy Publishing, an independent app publisher. We build small, focused tools that do one job well rather than everything badly.