About Mopsical
Most advice about “being productive” skips the part that actually decides how a day goes: whether your attention holds, whether you slept, whether the coffee is helping or wrecking tonight’s sleep, and whether the habit you started last week is still alive. Those are not vague motivational questions — they are things you can put numbers to. How many focus blocks fit before lunch, and when will they end? How much sleep debt have you quietly run up this week? If you drink that cold brew at 3pm, how much caffeine is still in you at midnight? How many hours of genuine deep work is it honest to plan for? Mopsical is built around answering exactly those questions.
Rather than long articles you have to read end to end, the site is a set of small, single-purpose calculators, each aimed at one real decision about focus and energy. The Focus Session & Pomodoro Planner lays out a run of focus blocks and breaks and tells you when you’ll finish. The Sleep Debt Calculator adds up a week of nights against what you need and estimates how long it takes to recover. The Caffeine Timing & Half-Life Calculator uses the real decay formula to show how much caffeine is still with you at bedtime and the latest you can have it. The Deep Work Time-Budget Planner turns your desk hours into a realistic weekly deep-work budget, capped at a sensible ceiling and split into blocks. The Habit Consistency Tracker measures how consistently you’ve kept a habit and what it takes to hit a target. And the Ultradian Energy-Cycle Planner fits your day to the body’s roughly 90-minute waves of focus and fatigue.
Alongside the calculators, the blog and learnsection explain the reasoning the tools rest on — why breaks stop attention from decaying, how sleep debt accumulates, what a caffeine half-life really means, and why deep work has a daily ceiling — and the Museum of Focus is a browsable look at attention and cognition, sleep and circadian rhythm, habit formation, and the meditation and focus practices behind them.
A few things worth stating plainly. Mopsical is independent and not affiliated with any app, brand, supplement, or programme. It is supported by advertising, which is how the tools stay free with no account required. Every figure a tool produces — a focus schedule, a sleep debt, a caffeine level, a deep-work budget, an adherence percentage, an energy-cycle plan — is a general estimate based on the numbers you enter and on widely used rules of thumb, not medical, psychological, or performance advice. Attention, sleep, and caffeine sensitivity all vary from person to person; for anything to do with your health or a persistent problem, talk to a doctor. If a tool looks wrong, or there is a calculator you wish existed, the contact page is the place to tell us.