Sustain
Focus Timer · Android
Deliberate blocks of deep focus, then recovery — so your attention grows over time. Train your focus like an athlete: one unbroken block, the sand falls, you stay.
Sustain is a calm, distraction-free focus timer built around how focus actually works — not just counting down minutes. Where most timers treat every minute the same, Sustain distinguishes between the hard early minutes of a session and the state of deep work that follows.
The app tracks a Focus Score, Focus Stamina, streaks, and a consistency heatmap — all stored entirely on-device. No account, no cloud, no analytics. Your focus history belongs to you.
Whether you're studying for exams, writing, coding, or doing deep work, Sustain gives you a structured way to build longer and stronger concentration over time — the same way an athlete builds endurance through deliberate practice.
One honest block at a time.
Flow mode guides you through the natural arc of deep work. You don't just start a timer — you move through three phases.
Struggle
The difficult first minutes where most people quit. Sustain normalises this phase — the discomfort is the work. Stay through it.
Flow
Uninterrupted, sustained focus. The sand falls, you stay. One unbroken block — no interruptions, no tab-switching.
Recovery
A real break after the block ends. Recovery is earned, not taken early. It's what makes the next session possible.
Focus your way.
Flow, Pomodoro, or your own custom length — then one finished thing.
Flow
Deep, uninterrupted blocks
Set an intention, pick your block length (or use your Focus Stamina), and go. One block, recovery after. The core Sustain experience.
Pomodoro
Classic structured intervals
The proven 25-minute work / 5-minute break cycle, with long breaks built in. Great for homework, reading, and daily task flow.
Custom
Your own rhythm
Set any work duration and break length you like. Fully flexible — for those who know exactly how they focus best.
A score that reflects real focus ability.
Your Focus Score is the average of your last 10 Flow sessions, on a scale of 0 to 100. It reflects your recent focus ability — not your whole history.
Everything you need. Nothing you don't.
Flow Mode
Our signature focus mode guides you through Struggle, Flow, and Recovery — the natural arc of deep work. Learning to stay through the struggle is how real focus is built.
Focus Score
An honest average of your last 10 Flow sessions, on a scale of 0–100. It changes gradually — rewarding consistency, not one good day.
Focus Stamina
Tracks the longest unbroken block you can sustain. Finish your stamina block to hold it; push past it to grow. Purely on-device, no cloud required.
Three Timer Modes
Flow for deep uninterrupted blocks, Pomodoro for classic structured intervals, and Custom for your own work/break durations. All in one app.
Private by Design
No account. No cloud sync. No analytics. Every session, stat, and insight lives only on your device. The one place data leaves is a purchase — billing only.
Nine Calm Themes
Warm dark, soft paper, forest green, midnight teal, dusty rose, and more — each theme ships in both light and dark. Switch whenever the room does.
Watch your focus grow over time.
Stamina, streaks and weekly rhythm — quietly tracked, entirely on-device.
Total Focus
42h 35m
All-time focus time
Focus Streak
17 days
Current daily streak
Avg Session
52m
Per Flow session
Best Streak
17 days
Personal record
Longest Session
1h 30m
Single unbroken block
Sessions
49
Total Flow sessions
No ads. No accounts. No tracking.
Fully offline. Everything you build stays on your device — always.
Fully offline
Sustain works without an internet connection. Sessions, stats, and your profile live only on this device. There is no account, no cloud, and no analytics.
No behavior tracking
The only time data leaves your phone is a purchase — billing through Google Play uses an anonymous ID. We never see your usage or payment details.
Manual backup
Because everything lives on-device, Sustain gives you a manual backup. Settings → Your data → Back up your data writes a single file you can save anywhere.
Start your first focus session.
Focus isn't something you find. It's something you build. Download Sustain free on Android and begin.