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What languages does it support? What OS? or is it a Web App itself?

The Mac App Store icon infers that it's a Mac app. As for languages, you're right that it isn't clear. Having said that, the main window is a text editor which performs highlighting on all of the major web languages (in Coda 1.x anyway).

If you're not a Mac user, how would you know what the App Store icon looks like?

There was nothing in the Help/FAQ either, so it wasn't until I manually navigated to panic.com, seeing that they do Apple apps, that I finally got pretty sure it wouldn't be available for my platform.

There comes a point where preparing for all levels of pedantry isn't wise and it's fine for people to assume a certain level of knowledge/experience from their target audience especially if their target audience isn't everyone.

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