Email organizer app designed to help you reach inbox zero

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Zero (iOS) works with most popular email providers, including Gmail, Yahoo, Hotmail, Outlook and iCloud. I always try to keep a clean inbox so will see if this helps.
I like the archive automatically mentality once you've read it. Personally I'm a big fan, but this may be a great tool to get through massive inbox counts from time to time.
Ok, call me lazy, I don't want to read through the docs yet. I use Gmail. Why switch?