Predictors for games like Aviator are usually a bust because of the RNG, but if you want to actually improve, recording your own sessions is the way to go. It lets you review your cash-out timing and spot your own habits.
For quick clips, I usually suggest checking out this list: https://www.movavi.com/learning-portal/best-free-mp4-editors.html. Using a proper editor to trim long recordings makes it much easier to analyze your gameplay without needing sketchy prediction apps.