Buy once instead of Sensei
3 apps in the directory cover what people use Sensei for. 2 of them are a one-time purchases, and one costs nothing at all.
Sensei costs about $29 a year. At that rate iStat Menus, the cheapest dollar-priced replacement at $11.99, pays for itself in 5 months.
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
Stats
MIT-licensed system monitor with a module for every menu bar readout
Free Open source
Fan control is in legacy mode and, in the README's words, receives no updates or fixes
iStat Menus
the long-running Mac system monitor, sold outright rather than rented
$11.99 Paid upgrades
Weather is a separate subscription once the six months included with a licence run out
coconutBattery
battery health readout for a Mac and for iPhones plugged into it
€12.95 This version
The cheaper Plus edition only gets 4.x updates — only the Lifetime Edition covers what comes next