If $39 is currently outside your budget, consider these legitimate completely free alternatives:
It’s a Windows plugin that adds advanced pen stabilization, line smoothing, and scripting to art programs like Photoshop, Clip Studio Paint, Krita, and Painter. It works as an external app that hooks into your drawing software.
Lazy Nezumi Pro (LNP) is a mouse and pen input stabilizer that connects between your drawing tablet and your art software. It offers:
For digital artists struggling with shaky lines, this tool can be a game-changer.