Sorry, I'm tried web tech in previous apps. This time I wanted build native, and I don't have resources to do it all.

What I would love...

Take a look at Bike's file format, it's just a subset of HTML. Would love to someone to write a web based editor for Bike's file format. Then you could edit Bike files anywhere you want... and also have cool native experience on Mac.

Also note that Bike does read/write .txt and .opml.