Looking for the one tool to rule them (to do, calendar, time,...) all

Been trying to do apps like Todoist, Wanderlust, used Evernote, Gmail calendar, various time-tracking tools but I basically come back to sending myself emails and using pen and paper. Any (very good) tool out there where I could aggregate both emails, calendars, to-dos (in an easy-to-read and handle way) and time-tracking, management. I do free work, paid work but also work I have to bill and need to be able to differentiate all (tasks, times, notes) with one click. I know I tend to chase the same unicorn many do but would something miraculous have appeared in recent times, feel free to shoot your recommendation. Thanks in advance.