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Free, too. GitHub don't mess around.

Any plans for putting it in the Mac App Store?

Yes. But the update experience for Mac App Store apps is so bad right now that it's a bit discouraging.

What about the update experience do you find so bad/discouraging?

It takes days/weeks for Apple to approve updates and then users have to consciously open the Mac App Store app and download them.

Keeping it free would perfectly make sense on the long run too, IMHO. It could attract a lot more users to githubcom and FI.