Sailcron helps you to manage your crontab(s) without the need for a command prompt.
Warning It takes root privileges to manage the root cron.
Using [cron-descriptor] (https://github.com/Salamek/cron-descriptor/) for converting cron expressions into human readable strings. Using [python-crontab] (https://github.com/doctormo/python-crontab) for the cron timestring syntax check.
App can be downloaded from [openrepos.net] (https://openrepos.net/content/ade/sailcron)