A caffeine tracker that stays on the phone
Know when to feed the goblin — and when to stop.
Coffee Goblin estimates how much caffeine is still in your system, how much will likely remain at bedtime, and when it is getting late for another typical drink.
The mug would say In the zone. Nicely caffeinated.
Logging
A couple of taps for a usual drink.
Espresso, flat white, tea, energy drinks, and the rest of a starter library are already there. Pick one, or type your own amount. Favourites and recents stay at the top.
Presets are starting points. Caffeine in a real cup varies by product and how it’s made, so you can edit a drink or log a custom one.
What it watches
The number, the bedtime, and the goblin.
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Still in your system
Each logged dose fades on its own. What’s on screen is the sum of everything that hasn’t worn off yet, including yesterday if it’s still there.
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Bedtime, ahead of time
The same estimate, run at your usual bedtime, next to a target you choose. Below the line, or already over it.
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A cutoff
The latest a typical drink can still fit under that bedtime target. If one more coffee would overshoot, the window is done for today.
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A face for the feeling
Power saving, in the zone, buzzing, goblin mode. The mug changes as the caffeine does. The launcher icon stays the brand face.
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On the home screen
An Android widget shows the same estimate and the live mood. It reads the data already on the phone. It does not send it anywhere.
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No account
Logs, drink presets, and settings stay on this device. No analytics, no crash reporting, and no network connection.
Estimates
A half-life, not a lab result.
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Log the drink
Name, milligrams, and when you had it. Future times don’t count until you reach them.
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Let each dose fade
The default half-life is 5 hours. You can set it between 2 and 10. Very old doses drop out of the sum.
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Look ahead to bedtime
Bedtime remaining uses your usual time. If today’s bedtime has already passed, tomorrow’s is used.
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See if another one fits
The cutoff is the latest a typical dose still fits in the gap under your bedtime target. If it doesn’t fit now, there is no clock time to show.
remaining = dose × 0.5 (hours elapsed ÷ half-life)
Privacy
The goblin does not phone home.
Coffee Goblin keeps caffeine logs, drink presets, and settings on this device. It does not use an account, analytics, crash reporting, or a network connection.
Read the privacy policy