Terms of use

Last updated November 14, 2026

Afterbuzz is not medical advice. Its numbers are estimates from a general model of how caffeine is absorbed and cleared. Your body may differ a lot. If you're pregnant, take medication, or have a heart, sleep, anxiety or other health condition, ask a doctor or pharmacist about caffeine.

Using Afterbuzz

Afterbuzz is a free tool for estimating how much caffeine is in your body over time. By using it, you agree to these terms. If you don't agree, please don't use the site.

Estimates only

Caffeine levels, bedtime amounts, "last call" times and sleep-friendly levels are estimates. Real caffeine content varies by drink, brand and preparation, and how fast you clear caffeine depends on genetics, pregnancy, medications, smoking, liver health and more. Don't use Afterbuzz to make medical decisions, and don't rely on it to judge whether it's safe to drive or do anything else.

Your data

Your log is stored only in your browser (see the privacy policy). Browsers can clear stored data, for example when you clear site data or, in Safari, after a stretch without visiting. You're responsible for exporting a backup if you want to keep your log.

No warranty

Afterbuzz is provided "as is", without warranties of any kind, including accuracy, availability or fitness for a particular purpose. We may change or discontinue it at any time.

Limitation of liability

To the extent the law allows, we aren't liable for any damages arising from your use of Afterbuzz, including lost data or decisions made based on its estimates.

Acceptable use

Don't attempt to disrupt the site, access it in ways that harm it or other people, or copy it to pass off as your own.

Changes

We may update these terms. The date above shows when they last changed; continuing to use Afterbuzz after a change means you accept the new terms.

Contact

Email hello@afterbuzz.app.