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



  • 100+ preset pens, pencils, brushes, and markers.
  • More layers.
  • Full layer controls with 18 layer blending modes.
  • Advanced selection tools (marquee, lasso, magic wand).
  • Gradient fills tools (linear, radial).

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