Let'sEnhance uses machine learning to enhance low resolution JPEG images, boosting resolution 4x times
Wow. I was skeptical. I know this kind of thing has been around before, but I have never seen it work at this level, especially because artifacts are pretty minimal. I still can't believe the "magic" 4x result I have sitting in front of me, from a 500x400-size starting image. Well done. This is definitely a service I would use.
Results came out way better than expected.
UI doesn't make the difference between "anti-jpeg", "boring", and "magic" clear. Should have a legend/key for less savvy users.