Since there is only one delete key on Mac, you'll want to go to Krita > Preferences > Keyboard Shortcuts > Menu > Edit > Clear and change the Clear hotkey to the Mac delete. Watch can i use onion skin in paint tool sai Video. In addition to PaintTool SAI, MediBang Paint (Freemium), FireAlpaca (Free), SketchBook (Freemium) and ibis Paint X (Freemium) are also free alternatives. In the making of traditional animations, artists draw on very thin papers and place the papers on a light source. Krita is a free and open-source alternative to PaintTool SAI that is the best free alternative. I think this is because the delete hotkey on Mac is by default assigned to the command 'fill with background color', which probably corresponds to the backspace key on Windows. Onion skinning is a 2D animation technique. The result is that it looks like the previous frame has been erased but the onion skin does not show up in reality I think the onion skin is there, but masked by the solid white. However, instead of making the current layer transparent, it makes it solid white. Since the auto frame mode is on, I pressed the right arrow key to go to a new frame and then hit 'delete' hoping to erase the mark from the previous frame. I created a new keyframe and made a mark on a transparent layer.

Chiming in to say that I was experiencing the same problem, but I noticed that it's not a problem with the onion skin functionality, but the delete hotkey filling the layer with white.

Krita onion skin