Superhuman

But there’s a difference to other software products: Superhuman has signal distribution built in. Every time you send an email via Superhuman, your recipient will notice a little “Sent via Superhuman” in your signature.

Superhuman, a cult-favorite and modern alternative to Gmail, has an entire command line of its own, activated by pressing Command + K. The app navigation is designed such that your movements are naturally fast. You’re forced by design to use the keyboard, as opposed to a mouse or trackpad.