Caffeine Log
Track caffeine intake by source and milligrams.
Overview
The Caffeine Log tracks every coffee, tea, energy drink, and caffeinated soft drink you have through the day, recorded in milligrams. It is built for people who suspect their afternoon slump, jittery hands, or stubborn insomnia might trace back to caffeine, and want hard numbers rather than guesswork. After a week or two of logging you will know exactly how much you are putting in, when, and from which source.
The default presets cover common drinks, espresso, drip coffee, black tea, green tea, cola, popular energy drinks, but you can also enter custom amounts when you know the exact dose, for example from a pre-workout label or a specialty coffee menu. The daily total is displayed alongside a configurable target, so you can see at a glance whether you are tracking under, at, or over your personal ceiling.
How it works
You log each drink with a source, an estimated or measured caffeine amount, and a timestamp. Entries are grouped by day, with a running total and a chart-style summary of when caffeine actually entered your system. Late-afternoon entries are highlighted because they are the ones most likely to interfere with sleep.
The data lives in your browser's local storage. Editing a wrong entry or removing a duplicate is a single click. There is no syncing, no account, and no shared dashboard.
Examples
- Logging a double espresso at 7 a.m., 150 mg, and a black tea at 10 a.m., 50 mg, for a 200 mg morning.
- Tracking a 16 oz cold brew at lunch, 200 mg, and noticing how it correlates with later sleep latency.
- Recording an energy drink before a long drive, 160 mg, and noting how it affected mood and concentration.
- Logging a decaf flat white as zero milligrams, just to keep the daily ritual count honest.
FAQ
Why milligrams rather than cups?
Caffeine content varies wildly by brew method and bean. Milligrams give you a comparable, repeatable measure.
What's a reasonable daily cap?
Major health bodies typically suggest staying under 400 mg for healthy adults, but personal tolerance varies. Your doctor's advice trumps any default.
Are the presets accurate?
They are reasonable averages. For specialty drinks, check the chain's published numbers and override the value.
Does it track timing relative to sleep?
Late entries are flagged in the daily view. Combine it with the sleep log if you want to correlate caffeine timing with sleep quality.
Can I track decaf?
Yes. Log it as zero or a small amount. Some decaf still contains traces.