If you want a zero inbox client, then InBox on top of gmail is pretty good.<p>I use FastMail as my primary email, and I don&#x27;t quite do zero inbox. I probably have on average 5 to 8 emails in my inbox, and a few stick around for days.<p>It takes some effort and overhead but I am trying to move away from email as being a &quot;memory box&quot; for organizing my life. Instead I am using subject organized markdown files stored in encrypted cloud storage where I maintain tasks, research notes, etc. since these are synced on my laptops, I can search them with spotlight, cortana, etc.<p>Combined with FastMail, this scheme keeps me organized. As easy as using InBox for email and TODOs? No, but so far it is working for me.