I've been using (and paying!) https://simpl.fyi/ for a few years now and it makes up for missing inbox for me. It was founded by the design lead for Inbox. Highly recommend if you use a Chromium-based browser.
It works in Firefox and Safari too. I like it a lot and pay for it.
How does it compare to Superhuman? (I use that now)
I miss Inbox too, but Gmail now has snooze functionality built in.
I had to stop using gmail/snooze on my ipad because the snoozes wouldn't be synced with my phone. Seems like such a poor implementation vs inbox.
yeah thats the struggle i had too. Found I'd snooze on my phone but then they're in my desktop.
I have the opposite experience with Google Now, it is useless and showing me mostly irrelevant information.
It is like that one kid, you know he is trying hard, but he could never make it.