Flat Tomato
6.7#13 in study timer appsFrom $2.49 a yearFree planiOSmacOS
Visit
Flat Tomato may suit people who want a distraction-focused timer with task planning and effort estimates. It also fits users who want progress statistics or iOS support for Todoist, Evernote, and Apple Watch complications.
You want what its maker publishes above — check its page for the details.