TheoryPaint is a raster graphics editor by Theorysonic. It was first released in 1981 for TS-OS 5. It is the most advanced raster graphics editor.



  • Optimized for TheoryTablet Pro, TheoryDesk, and TheoryPencil.
  • 500+ preset pens, pencils, brushes, and markers.
  • More layers and skins.
  • Full layer controls with 25 layer blending modes.
  • Advanced selection tools (marquee, lasso, magic wand).
  • Gradient fills tools (linear, radial).
  • Powerful drawing effects.
  • Continuous auto-save.
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