A calm focus timer built on one idea: focus is trainable, like a muscle. Do deep Flow sessions, take real phone-free breaks, and watch your stamina grow. A beautiful falling hourglass, three modes, no ads, no tracking — nothing collected, ever.

Hi everyone — I'm Deep, the solo maker of Sustain. I built Sustain because most focus apps felt wrong to me. They either shout at you with a giant countdown, guilt-trip you with streaks, or quietly harvest your data. I wanted the opposite: a calm, honest tool that treats focus as something you can actually train. So it's built on one idea — focus is trainable, like a muscle. You do a deep Flow session, push through the awkward "struggle" phase into real flow, then take a phone-free break to recover. Over time your focus stamina grows and the app adapts to it. There's Pomodoro and a fully custom mode too. The whole screen is one falling hourglass and nothing else — no clutter, no dopamine tricks. And it collects nothing: no accounts, no ads, no tracking, everything stays on your device. The core loop is free forever; Pro just adds deeper insights and extra themes. It's Android-first — I'm bootstrapped and building on what I can afford, iOS comes as it grows. I'd genuinely love your honest feedback: does the "train your focus" framing land? What would make this your daily focus tool? Thanks for taking a look.

Honestly the falling hourglass animation is super satisfying, way better than those typical circular timers. Really liked the phone-free break nudge too, it actually made me put the phone down instead of just opening another app.

the falling hourglass is honestly such a nice touch, makes it feel calming instead of stressful. one thing i'd love is the option to log what you were working on after each session, like a tiny note field, so you can look back and see which tasks really broke your flow.

the falling hourglass animation is genuinely lovely, and pairing it with a no-tracking promise shows real respect for users. appreciate the restraint.

Sustain: Focus & Study Timer

Train your focus like an athlete — a calm focus timer

Train your focus like an athlete — a calm focus timer