Caffeine Budget is not another logger. It's the coffee-drinking buddy who taps you on the shoulder before that second latte and says: hey, this one will cost you.
One tap tells you three things: how much caffeine is still in your body right now, what will remain at bedtime if you drink this cup, and the exact hour you should have your last cup today.
WHY CAFFEINE BUDGET
Most apps show what you drank. Caffeine Budget shows what happens next. The whole product is built for the 3 seconds before you lift the mug — the moment a real friend would speak up.
• Real-time residual curve — see caffeine rise, peak, and fade across the day.
• "If I drink this" simulator — pick a cup, see tonight's residual before you sip.
• Personal cutoff line — a live red line that tells you the latest time you can still drink and sleep well.
• 3-second logging — 12 quick tiles (coffee, tea, milk tea, energy × small, medium, large) or manual mg.
• Personal metabolism — onboarding sets your baseline, morning sleep check-ins refine your half-life over time.
• Three model tiers — Standard, Advanced (absorption ramp) and Scientific (based on public US Army UMP research). You pick the precision you trust.
• Lock screen and Home widget — glance at your current level and cutoff without opening the app.
• Gentle nudges — morning plan, cutoff approaching, bedtime recap.
HOW IT WORKS
1. Answer 3 quick lifestyle questions in onboarding — pregnancy, contraceptive, smoking, sensitivity — we set a safe starting half-life.
2. Log a cup in 2 taps. The curve updates instantly.
3. Before every next cup, tap "If I drink this" to see the sleep risk.
4. Each morning, a 5-second tap on how you slept teaches the app your real metabolism.
BUILT FOR HEAVY DRINKERS WHO WANT TO STAY SHARP
Caffeine Budget is for professionals, students, parents, shift workers — anyone drinking 2 to 5 cups a day who already noticed the sleep tax. We won't tell you to quit. We help you keep the ritual and keep the rest.
WHAT WE DELIBERATELY DO NOT DO
No giant brand database. No milligram-level guessing. No medical claims. No dark patterns. Just the one number that matters: how much will be in you at bedtime.
Your data stays on device by default. No account required to start.
Caffeine Budget — the buddy who knows when you've had enough.
Disclaimer: Caffeine Budget is a lifestyle tool, not medical advice. Caffeine sensitivity varies. Consult your doctor for pregnancy or health conditions.
Apple Standard EULA:https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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