Caffeine Budget isn't another logger. It's the friend across the cafe table who taps you on the shoulder before that second latte and says: hey, this one's going to cost you tonight.
One tap tells you three things: how much caffeine is still in your body, what will remain at bedtime if you drink this cup, and the exact hour you need to have your last cup today.
Don't quit coffee. Drink it with a buddy who's got your back.
Free on the App Store — iOS 16+
Most caffeine apps show what you drank. Yesterday. Past tense. Useless at 3pm when you're staring at that second latte wondering "will I regret this at 2am?"
Caffeine Budget was built for exactly that moment. The 3 seconds before you take the first sip — the moment a real friend would speak up.
Open Caffeine Budget. Under two seconds, you see three numbers that matter: current caffeine level, projected residual at bedtime, and your daily red line. No scrolling. No menus. Just the answer a friend would give you.
Twelve tiles — coffee, tea, milk tea, energy drinks × small, medium, large. Tap one and instantly see the sleep risk, plus friendly swaps ("small cup instead", "switch to decaf", "wait until tomorrow").