One particularly funny thing about Flipaclip is that, for whatever fucking reason, coloring in it is Incredibly painful.
If you try to add color to your lineart, and the lineart is in another layer, the color will just... Flow through the screen. It doesn't work properly.
I honestly don't even know how to explain, my english isn't englishing right now LOL
Yatsufusa
My takeaway from this post is that you are asking for better software. Here's a selection:
https://www.newgrounds.com/wiki/creator-resources/
HztaOra
i'll take a look at these, but the reason why i use flipaclip is because it is free (and easy to pirate but you didn't hear that from me) and it's on mobile lol. Animating on my phone is easier than animating on my crappy notebook using a mouse or the touchpad... But i'll definitely take a look at OpenToonz, Blender and Flash with Swivel... Krita is also pretty interesting