The best Interior Design alternative to Autodesk Tinkercad is SketchUp. It's not free, so if you're looking for a free alternative, you could try Womp or pCon.planner. If that doesn't suit you, our users have ranked more than 50 alternatives to Autodesk Tinkercad and four of them are Interior Design Apps so hopefully you can find a suitable replacement.
Comprehensive 3D modeling software ideal for architecture, engineering, film, and gaming. It includes features like easy-to-use interface, sun and shadow analysis, color experimenting, and mock-up creation. Available in freeware and professional versions for diverse needs.
Womp is a free and beginner friendly browser based 3D design software, allowing anyone to easily create professional and 3D printing ready creations live from virtually any device and without any technical knowledge.
The professional furnishing 2D-/3D-tool for everybody: The pCon.planner is a cost-free application allowing you to comfortably and professionally create complex furnishing concepts and to visualize them in a photo-realistic quality. File Formats: dwg, dxf, 3ds, skp, ... Language.
ArchiCAD offers computer aided solutions for handling all common aspects of aesthetics and engineering during the whole design process of the built environment — buildings, interiors, urban areas, etc.
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The ease of use is similar to Tinkercad. The modality is BREP and sketch/extrude which is different though.