How do deployments work? Export code or can you push to Mailchimp, et al ?

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For emails, innit.

Sorry if this sounds stupid. Isn't this the same kind of editor you get with the likes of mailchimp? What's the USP? In case I've missed something?

This looks interesting. Is there any way to try out the editor without singing up for a plan? There are a lot of email editors out there claiming to produce good code, but very very few of them actually do.