You can sync your Arosoftware calendar with ios calendar

Add a Calendar account to your ios device/iPhone

1. Start by locating your My Caldav URL
   
2. On your iPhone, open the Settings app from your home screen
   
3. Tap the Calendar menu then Accounts then Add Account
   
4. Tap Add CalDav Account
   
5. Enter your My Caldav URL into the Server field (See screenshot below)
   
6. Enter your Arosoftware login details into the Username and Password fields
   
7. Give the Calendar account a description such as My Arosoftware Calendar
   
   
8. Click Next
   
9. Ensure that Calendar is enabled and that Reminders is disabled and click Save
   
   
10. Your Arosoftware calendar has now been synced with your iPhone and your events will be visible within the IOS calendar app.