If you don't want to deal with expiring license codes, CareUEyes Lite is the official freeware version.
Activating a valid license unlocks the full feature set designed to reduce eye strain: Blue Light Filter Careueyes Free License Code
A: No. Careueyes writes a registry key and creates a hidden file in AppData . Even after uninstalling and reinstalling, it remembers that your trial has expired. Only a fresh Windows install would reset it (which is extreme overkill). If you don't want to deal with expiring
: A built-in Windows 10/11 feature that filters blue light without extra software. Careueyes Free License Code