Yes! The app shows all events from Calendar (including iCloud) and instantly syncs back there if you add an event.

Some feedback now I've tried it out (for just a few minutes)

The lack of "double-click to add an entry <here>" is unintuitive - I've got very used to that action in iCal/Calendar. I would imagine that anything you can do to replicate the built-in calendar interaction would be a bonus.

Im slightly confused about who makes this app. This page is from "Mornings", but everything in the App store and in the App itself reference "Ready Tap Go".. I think the app is great, but I'd feel more comfortable if I knew whose App I'm giving access to my calendar data

Thanks for taking a look!

Double-clicking to add events and more consistent branding are definitely on my to do list. Mornings is a suite that will include more productivity apps (in the works!)