What is truly the best productivity app?

One you use at least twice per day for few months now and has had a dramatic impact on how you get stuff done.
Ernest SemerdaCofounder of @IQBOXY (YC W17) #aussie · Asked
Vazgen BadalyanProduct & Analytics · Written
This might be an obvious one for some people, however it's worth a mention. Information management hub for me.
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