What Cups Deep collects
Short version: your day is saved on your device, not in an account. The site counts visits and watches how the instrument gets used, so it can get better. You can say no and still use everything.
Your day stays with you
The drinks you add, your wake and bed times and your half-life setting are saved in your own browser, so the instrument remembers them next time. There is no account and the site has no database of anyone’s day.
A share link is the exception you choose: the link itself carries the day, so whoever has the link can see it. The site strips the day out of every address it reports to analytics.
One honest caveat: if you are counted in full, a session replay shows the page as you saw it, drinks and all. Counted anonymously, there is no replay.
What analytics sees
Cups Deep uses PostHog, hosted in the United States, to count visits and to see how the site is used. It runs in one of two ways.
- Counted anonymously: no cookies and nothing stored in your browser. PostHog gets the page, the time, your rough location from your IP address, your browser and device type, and events like “a drink was added”. Visits cannot be tied together from one day to the next.
- Counted in full: the same, plus cookies and browser storage that recognise a returning browser, and session replay, a recording of clicks, scrolling and what the page showed, with anything typed into a field masked.
Who is asked first
In the European Economic Area, the United Kingdom and Switzerland, the site asks before counting you in full. Until you say yes, and if you say no, you are counted anonymously.
Everywhere else you are counted in full from the start and can turn it off at any time.
If your browser sends a Global Privacy Control signal, the site treats it as a no, wherever you are, and does not ask.
How to say no, or change your mind
Use “Privacy choices” at the bottom of any page. A no takes effect at once: cookies and replay stop and you are counted anonymously. Your answer is remembered in your browser so you are not asked again.
Clearing your browser’s site data for cupsdeep.com removes everything the site has stored there, including your saved day.
What is not collected
No name, no email address, no account, no payment details. Nothing is sold and there is no advertising. The numbers you enter describe a typical body’s caffeine curve; the site does not ask about your health and should not be treated as a record of it.
Who else handles data
Vercel serves the site and, like any web host, sees the requests your browser makes, including your IP address. PostHog processes the analytics described above. Search engines see only what is public on the pages.
Questions
Cups Deep is run by Riku Uski. Ask him on LinkedIn. Last changed .