Alternatives to PaintTool SAI

FireAlpaca suits illustrators and people learning design or image processing who want a free painting tool across desktop platforms.

ibisPaint

ibisPaint suits people drawing on phones, tablets, or computers, including manga and animation creators.

Clip Studio Paint

PRO is described for concept artists, illustrators, and designers.

Drawpile

Drawpile suits people who want to make art or animation together on a shared canvas, whether online or offline.

Krita

Krita suits illustrators, comic and concept artists, matte and texture painters, and people working in digital VFX.

Adobe Fresco

It suits illustrators and artists working with stylus or touch input on supported iPad, iPhone, or Windows devices.

Limner

Limner suits illustrators, animators, and comic or manga creators who want drawing, animation, and export tools in one app.

Artweaver suits beginners and advanced users who want painting brushes alongside image-editing tools.

Sketchbook

Sketchbook suits people who want a drawing app across mobile and desktop, including stylus users and artists working with layered PSD files.

HEAVYPAINT

HEAVYPAINT suits artists making plein air work, color studies, concept sketches, or figure and gesture drawings.

Infinite Painter

Infinite Painter is aimed at artists from hobbyists to professionals who want mobile painting and drawing tools.

InkForge

InkForge suits digital artists who want drawing, layer and frame-by-frame animation tools on desktop platforms.