Hello, there are many improvements in the Pro app version, it is definitely worth upgrading. If you won't like it, you can uninstall it within 2 hours and you will automatically get refunded.
Added a 14 days free trial period Increased minimal required Android OS version to 6 Allow changing the app colors Added tasks and Monthly + daily view Allow importing events and app settings Allow changing time zones Added many settings and improvements from the Pro version Added many stability, performance and UX improvements