How to sync eM Client with (none Google account) smartphone apps (calenders and contacts) or is their a eM Client android app?

I like eM Client but I haven’t found an easy way to keep especially my calendar and contacts in sync with my pc. I prefer not to use the google account. What software/app can I use to achieve this? This complication is extremely bothersome for me?

you can use e.g. Fruux. We have good experience with this service.