“The strongest match is Amazing Marvin.”
“Super Focus Mode displays only one task.”
“Hides the sidebar and all other tasks.”
“Optional session timer, progress bar, automatic time tracking and focus music.”
“Available on desktop and web.”
“I'd start with Amazing Marvin because it has the most complete implementation of the experience:”
“A separate floating window to keep your current task visible while using other apps.”
“Amazing Marvin | No documented automatic notification blocking”
“One task, timer and no distractions.”
“Tracks time, task switches and distractions.”
“Android-only, currently distributed as an APK in alpha.”
“Tofu's Tasks | Not specified”
“3. TOT – That One Thing”
“Focus Mode shows only the next task.”
“Designed around displaying one task at a time.”
“Includes task management, calendar and smart reminders.”
“TOT | Not specified”
“Focus Mode displays one urgent task on its own screen.”
“Optional Pomodoro timer and focus sounds.”
“Keeps a live focus notification visible”