Glad to be part of the team that brought you Haven. We’re quite proud with the outcome. and we're listening to your feedback. Version 1.1 will bring markdown as requested by many users. It should be out early June!
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Nice looking app! Plus very relevant in the 'Medium' hype.
The lack of screenshots in your website is a big drawback though...
Haven
Golden Kitty Awards 2016
Osaurus