Changed to faux flipnote (new tag I made) instead of Flipnote Studio (medium) because it uses colors that no version of Flipnote is able to use and includes a lot of text that obviously doesn't resemble the pixelated text used in that software. Super impressively convincing though, makes me wonder what a new version of Flipnote would look like.

Edit: Checked the source and the artist confirmed they use Toonsquid :)