The app did a pretty good job of stabilizing my video! However, I don’t recommend it to people trying to do serious video work, as regardless of your encoding settings, the video gets seriously compressed before the app even starts to analyze it, so the output looks terrible quality, to my eyes.
If you don’t care about that sort of thing, this app might be a great option for you!
To the developer, I would also recommend clarifying the “shakiness” slider — is it for setting “how shaky is the input” or “how much stabilization should be applied?” I tapped the label and got an explanation that didn’t clarify this difference.
Additionally, I think what the previous one-star reviewer may have run into is assuming that the stabilized output would be automatically saved, not realizing that you have to export it. I would recommend making that more obvious as well.