See how much caffeine is still active now and at bedtime
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Caffeine doesn't leave you the moment the cup is empty. Vrendrakox Jolt keeps track of what is still circulating, modelling clearance by half-life so the number you see isn't what you drank — it's what is still working on you right now, in milligrams.
Logging takes seconds. Twelve drink tiles cover the things you actually reach for: choose one, set the serving size, say how many hours ago you drank it, and log it. The active-caffeine figure updates straight away, the ceiling bar shows how much of your daily allowance that leaves, and the decay curve runs forward to your bedtime so you can see what will still be in you when you try to sleep.
That curve is the part that changes behaviour. A mid-afternoon refill that felt harmless can land on the chart as a stubborn tail still crossing bedtime, while the same drink two hours earlier barely registers. Instead of guessing, you can look at the shape of the evening before you pour.
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Everyone clears caffeine at their own pace, so the model is yours to adjust. The gear icon opens Setup, where you choose your ceiling, your clearance speed and the hour you intend to go to bed. Tune those three and both the bar and the curve recalculate around your own routine rather than an average one.
History turns single days into a pattern. Daily totals show whether the week has crept upwards, the biggest caffeine sources name the drinks doing most of the work, and the clean-night count tallies the nights you reached bedtime with your system clear — one simple figure to nudge in the right direction.
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Whether you want to cut down gradually, hold a steady level through a long shift, or finally work out why you are staring at the ceiling at one in the morning, Vrendrakox Jolt answers in milligrams instead of guesswork.