Sustain: Flow & ADHD Timer

A focus timer you can see. Instead of a countdown number, Sustain gives you a real hourglass — a sand timer with falling grains — so time becomes something you watch rather than something you calculate.

If time never feels like it is passing until it has already gone, that is the problem this solves.

─── BUILT FOR PEOPLE WHO CANNOT FEEL TIME PASS ───

Time blindness makes a digital timer close to useless. A number tells you nothing until you stop, read it, and do the arithmetic. A visual timer works differently: the sand falls whether you are watching or not, and a single glance tells you where you are.

Many adults with ADHD keep a visual timer nearby for exactly this reason. Sustain is a calm one — a timer rather than a planner, and it will not nag you, gamify you, or punish you for a bad day.

─── FOUR WAYS TO FOCUS (all free) ───

• Flow — one unbroken block of deep focus, with real recovery afterwards. The signature mode.
• Endless — no target and no countdown. The hourglass simply runs until you end it yourself. For hyperfocus, or for the days when choosing a number is the hard part.
• Pomodoro — the classic focus and break cycle, from 25/5 through to 90/15.
• Custom — set your own focus and break schedule.

─── THE FLOW METHOD ───

A session moves through three honest phases. The Struggle: the first hard minutes, which are normal and temporary. Flow: deep, absorbed work. Recovery: a real, phone-free break.

Naming the Struggle is the whole point. Most people quit in the first hard minutes, right before the good part arrives.

Focus Stamina learns your sustainable block length and grows it gradually, so your blocks get longer as you do.

─── A SCORE THAT WILL NOT SHAME YOU ───

• Focus Score — a 0 to 100 reflection of your recent focus ability. It moves gently, so one rough day cannot tank it.
• Your streak survives a missed day.
• A session under two minutes records nothing at all, so nothing is ever inflated.

No guilt mechanics. No creature that dies if you look away. No leaderboard.

─── SEE YOUR FOCUS OVER TIME ───

• A calm consistency heatmap, focus over time, and your personal bests.
• When you focus — your peak focus window by hour, and your strongest day of the week.
• Export your full history as a CSV file, or generate a detailed PDF Focus Report to keep, review, or share with a tutor or coach.

Most timers forget you the moment the session ends. This one remembers, and shows you the shape of it.

─── PRIVATE BY DESIGN ───

Your focus data never leaves your device. No account. No sign-in. No analytics. No crash reporting. No advertising. Sustain has no server, so we literally cannot see your data — it runs completely offline, in airplane mode if you like. Export or delete everything at any time from Settings, under Your data.

─── GOOD FOR ───

Studying, revision and exam preparation. Tracking study time honestly. Deep focus work, writing and code. Practice sessions. Meditation and quiet, phone-free minutes when you simply need the sand to fall.

─── SUSTAIN PRO ───

• Full Insights — Focus Score and Focus Stamina over time, your peak focus window, follow-through, personal bests, average session, and the shareable PDF Focus Report
• Every colour theme, with Lifetime — Obsidian, Sage, Rosé, Indigo, Dusk, Tide, Noir and Mocha. Monthly and yearly unlock every Pro feature; themes are one-time goods you own forever, and sold singly
• Longer pauses, plus a near-end nudge to keep a Pomodoro or Custom session running past its end
• One-tap session reuse

Monthly, yearly, or a one-time lifetime unlock. The core app stays free.

─── NO NONSENSE ───

No social feed. No gamification designed to pull you back. No subscription required to focus. Just a calm timer, an honest score, and the focus you are building.

Sustain is a focus and productivity timer. It is not a medical device, and it does not diagnose, treat, cure or prevent any medical condition.

Train your focus like an athlete. Start your first block today.