One task, and nowhere to put a second
You write down the one thing. The app does not offer you a list to grow, and when the task is finished it does not hand you an empty box and ask for another.
Productivity · Offline
One task a day, one focus timer, one streak. No account, no ads, works offline.
A to-do list lets you collect work, and collecting feels like progress until the list is long enough to be its own decision. One Thing removes the list: you choose a single task for today, give it a timer if you want one, and when it is done the day is done. There is nowhere to put a second task, so there is nothing to decide except starting.

Key features
Everything below is in the app today. Nothing here is a roadmap item.
You write down the one thing. The app does not offer you a list to grow, and when the task is finished it does not hand you an empty box and ask for another.
Pick a length or set your own. The countdown is tracked against the real clock, so it stays right whether you switch apps, take a call or restart the phone. You are alerted before time runs out and again when it does, with the app closed and the screen off.
The timer keeps counting past the end and the task still counts as finished. Finishing late is finishing.
Choosing is one problem and starting is another, so alongside the task you can note the one action that needs no plan — and that is what the app keeps in front of you.
Every finished day fills a dot on a five-week calendar, gaps included, because the gaps are what make a run worth protecting. Today counts as in progress, so a streak is never at risk while the day is still going.
Tasks finished, days completed, total time focused, your average session and the weekday you finish most. Every completed task stays in a history you can scroll, delete from, or export as a CSV.
The app asks Android for no internet permission at all, so everything happens on the phone. That is enforced by the operating system rather than promised by us.
What it looks like






Who it's for
Fourteen items, no obvious first one, and the app is shut before anything is started. This one holds a single task on purpose.
If nested projects, tags and priorities turned into the thing you were actually doing, there is nothing here to organise.
No badges, no levels, no leaderboard. One dot per day you finished, and one nudge in the evening if you have not.
Price
Free. No subscription, no trial and no locked features — including the statistics and the CSV export that other apps charge for.
Free to download from Google Play. No account, no sign-up.
One Thing: Daily Focus Timer —Get it onGoogle PlaySmall print
Everything this app is committed to, in the documents that commit it.
Read exactly what stays on your phone, and precisely what the one outside company involved in this app can see.