Caffeine Budget is not another coffee logger. It's the buddy who taps your shoulder before that second latte and says: hey, this one will cost you tonight.
One glance tells you three things: how much caffeine is still in your body right now, how much will still be there at bedtime if you drink this cup, and the exact hour to make it your last.
WHY CAFFEINE BUDGET
Most apps tell you what you drank. Caffeine Budget tells you what happens next. Everything is built for the three seconds before you lift the mug, the moment a real friend would speak up.
• LIVE RESIDUAL CURVE — watch caffeine rise, peak and fade across your day.
• IF I DRINK THIS — pick any cup and see tonight's sleep impact before you order it.
• YOUR CUTOFF CLOCK — a personal last-call time that moves with your day.
• HALF-LIFE THAT LEARNS — a five-second morning check-in tunes your metabolism week by week.
• 3-SECOND LOGGING — twelve quick tiles (coffee, tea, milk tea, energy drink x small, medium, large), or type your own mg.
• THREE MODEL TIERS — Standard, Advanced with an absorption ramp, and Scientific based on public US Army UMP research. Choose the precision you trust.
• WIDGETS — current level and cutoff on your Lock Screen and Home Screen.
• GENTLE NUDGES — morning plan, cutoff approaching, bedtime recap.
HOW IT WORKS
1. Answer three lifestyle questions: pregnancy, contraceptive, smoking, sensitivity. We set a safe starting half-life.
2. Log a cup in two taps. The curve updates instantly.
3. Before the next one, tap If I Drink This to see the sleep risk.
4. Each morning, one tap on how you slept teaches the app your real metabolism.
MADE FOR PEOPLE WHO ARE NOT QUITTING
Caffeine Budget is for professionals, students, parents and shift workers drinking two to five cups a day who already feel the sleep tax. We will not tell you to quit. We help you keep the ritual and keep the rest.
WHAT WE DO NOT DO
No giant brand database. No fake milligram precision. No medical claims. No dark patterns. Just the one number that matters: how much will be left at bedtime.
Your data stays on your device by default. No account needed to start.
Caffeine Budget — the buddy who knows when you have had enough.
Caffeine Budget is a lifestyle tool, not medical advice. Caffeine sensitivity varies. Talk to your doctor about pregnancy or health conditions.
PRO SUBSCRIPTION
Caffeine Budget Pro is an auto-renewable subscription. [ADD PRICE: monthly and annual, e.g. $2.99 USD / month, $19.99 USD / year]
• Payment is charged to your Apple Account at confirmation of purchase.
• Your subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period.
• Manage or cancel your subscription anytime in your Apple Account settings.
• Any unused portion of a free trial, if offered, is forfeited when you purchase a subscription.
Apple Standard End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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