-Customizable calendar layers & views: Use both local and iOS data calendars at the same time with direct sync options to various services.
Free calendar app version or paid version unlocks more sync options and tasks, projects, and contacts.
Use your current calendar accounts (free) or setup a Informant Sync account (paid feature).
More than just a calendar app, Informant also organizes your tasks into projects, and has many options for your agenda organized.
It works with native Apple data including iCloud, Exchange, Outlook.com, Microsoft 365, Google Calendar, Yahoo, AOL and more.