Buy once instead of Superhuman
3 apps in the directory cover what people use Superhuman for. 2 of them are a one-time purchases, and one costs nothing at all.
Read the catch on each one before you switch — a one-time price is not automatically the better deal, and we say so where it is not.
The replacements
Thunderbird
free mail, calendar and contacts with no tier above it
Free Open source
Nothing to pay, but it is a cross-platform app that never quite feels Mac-native
eM Client
mail, calendar and contacts client whose one-time licence covers future versions
€39.95 Perpetual
VIP Support is free for the first year only, then needs a paid extension
Canary Mail
ai mail client that still sells a one-time lifetime bundle
$99.99 Lifetime tier
The lifetime price is not printed on the pricing page — only Apple's listing shows $99.99