PaintTool SAI is described as 'Is high quality and lightweight painting software, fully digitizer support, amazing anti-aliased paintings, provide easy and stable operation, this software make digital art more enjoyable and comfortable' and is a very popular digital painting tool in the photos & graphics category. There are more than 50 alternatives to PaintTool SAI for a variety of platforms, including Windows, Mac, iPad, iPhone and Linux apps. The best PaintTool SAI alternative is Krita, which is both free and Open Source. Other great apps like PaintTool SAI are MediBang Paint, Adobe Photoshop, FireAlpaca and ibis Paint X.
AzPainter is a full color painting program for Linux. It's a lightweight tool with tablet pressure support, and provides basic functions such as selection, layers, filters. you can use it for painting, image editing, or pixel art making.
Smooth brushes, almost like PaintTool SAI. Includes "cell animation". ultra light, loads in 1 or 2 seconds in my computer.
Has almost funtions as Sai does
SketchPort is an online drawing community with free software for PC, Mac, iOS, and Android. Draw, chat, vote, be inspired, be challenged and earn badges!
Paintstorm Studio is created for professional digital painting. And a major role in this program play the brushes. We did our best so that you can easily and quickly adjust the brushes suitable for your painting style.
Emulates realistic watercolor, acrylic, and dry media with physical paint diffusion, drying control, textured canvas, custom brushes, tilt and pressure support, color blending, masking tools, paint granulation, backruns, stencils, rulers, and high-res export.
Free vector graphics editor offering real-time collaborative editing, browser and cross-platform desktop support, scalable design tools, AI, EPS, SVG, PNG, JPEG import/export, grouping and shape manipulation, and intuitive pen and freehand drawing options.
Kleki is a multi-platform web app for painting and editing. It features: 4 different brushes; pressure sensitivity for Wacom tablets; up to 8 layers; numerous filters with real-time preview; import to PSD, PNG, JPEG; export to JPEG and PNG; upload to imgur.com; local storage.
Open source image editor with non-destructive editing, 110+ filters, adjustment and text layers, support for smart objects and adjustment layers, cross-platform compatibility, and layer-based editing for flexible image composition.
A powerful and unique digital art program, focusing on natural media painting, photo editing and illustrative styles.
Unlock creativity with a massive brush collection and real-time effects. Blend oils, paint with vibrant watercolors, and enjoy vector and raster brushes on stylus-ready devices. Ideal for artists of all levels.
openCanvas, popularly abbreviated as oC, is a popular Japanese image editing program.
Milton is an open source application that features an infinite canvas. It feels raster-based but internally it works with vectors. It lets you export your work at any resolution.
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Lightweight, very simple and powerful.