Artflow Studio might be a bit more popular than Paintstorm. We know about 1 link to it since March 2021 and only 1 link to Paintstorm. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If she wants to expand and more than just mimic traditional paints there are even more programs she might want to consider, the king of the "generalist" softwares is Photoshop, my personal choice, but there are valid alternatives out there, starting from the free and open source Krita, to cheap but solid programs like Clip Studio Paint (especially good for comics/manga, but it can also do other stuff), Paintstorm... Source: over 2 years ago
Ok well for Android I recommend is artflow on Android http://artflowstudio.com. I’ve used it before I got my iPad and liked it for its may Brush selections but is a one time payment. Idk if you want a free app Or if your willing to spend a little bit of Money for it. Source: almost 2 years ago
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Corel Painter - Corel Painter is media painting software.
Clip Studio Paint - The artist's software for drawing and painting.
MediBang Paint - The official site for MediBang Paint, the free digital painting and manga creation software. You can download the latest version of MediBang Paint here, and get news and tutorials.
PaintTool SAI - Learn to draw in different ways.