Now that you mention it, I noticed how bad the IG version looks like compared to the one on my computer. I put the resolution at 1080 wide, to match the one on IG, but the quality is a lot worse than what I have.
I might check to see how steepshot compresses it. Maybe it's better than IG.
You should also check out APPICS.
Is it out already? I thought it's still in development and not yet out there.
The beta is out. If you can get though their waiting list ;-)
I'm already subscribed since a few months ago, but haven't yet received any email letting me know about the beta.