What are free tools for style flat colors 3D models?

Free tools for flat-color 3D models include Blender, Krita (with 3D support), and Vectary—all let you apply solid colors and simple shading for stylized results. Blender uses basic materials (no specular/texture details) for flat looks. Krita’s 3D layers let you paint flat colors directly on mesh surfaces. Vectary has pre-made flat material presets and easy web/print export. For beginners, try Vectary—it’s browser-based, so you can experiment with solid colors on 3D models without downloads.