Sip is a quiet caffeine tracker. It helps you build a habit that fits
your day — and your sleep — without judgment, accounts, or ads.

Most caffeine apps are either glorified counters ("you had 320 mg
today, here's a frowning face") or they treat caffeine like a calorie
budget. Sip does something more useful: it models how the caffeine
you've actually drunk is moving through your body, and tells you when
the effect will wear off.

Tap a drink. Watch it move from your gut to your bloodstream over the
next 30 minutes. See it peak. Watch it fade. Know — without guessing —
whether that 4pm espresso will keep you up tonight.

— WHAT YOU'LL SEE —

• A cup hero that fills as you sip and clears as caffeine leaves your
body. A horizontal accent line inside shows what's "active" right
now (in your bloodstream) versus what's still being absorbed.

• Three at-a-glance stats: when you had your last sip, when the effect
will wear off, and when caffeine will be fully gone from your system.

• A 7-day history heatmap showing hour-by-hour caffeine in your blood,
so you can see your real pattern — not just totals.

• Sleep-aware warnings: log a sip after your bedtime cutoff and the
app flags it before you commit, so you can make the call yourself.

— HOW IT'S PERSONALIZED —

Sip asks for three things during a 30-second setup: your weight, how
strongly caffeine hits you (low / normal / high), and your usual
bedtime. Those three numbers feed a real two-compartment
pharmacokinetic model — the same math used in clinical research — so
the curve is yours, not a generic average.

Drink size in oz or ml. Weight in kg or lbs. Both flip at a tap.

— PRIVACY: EVERYTHING STAYS ON YOUR DEVICE —

• No account. No email. No login.
• No cloud. No servers. No syncing — Sip has nothing to sync to.
• No analytics. No advertising. No third-party SDKs.
• No network requests, ever. The app works identically with airplane
mode on.
• Export your full log as CSV any time. Wipe everything in one tap.

If you delete the app, your data goes with it. There is no copy.

— WHAT'S NOT IN HERE —

• No ads.
• No "you went over your limit" guilt.
• No social feed, no leaderboards, no points.
• No subscription. The whole app is just here.

— FOR WHO —

People who notice that coffee at 3pm sometimes ruins Tuesday's sleep
and want to actually understand why. Shift workers, light sleepers,
parents of small humans, runners using caffeine as a training tool,
anyone who's traded their fifth cup for "I don't know, when did I last
have one?"

If you want a habit tracker with confetti, this isn't it. If you want
a quieter, more grown-up relationship with caffeine — one cup at a
time — that's Sip.

Yara apps

Additional Information