In a nutshell: a cron daemon on RFC 5545 calendar files
(aka iCalendar aka ics) with execution resolution up to one
second, per-task configuration of everything, and which can
be run in daemon mode by any user.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: