| App | Price | Kernel | Touch UI | Export STEP | Best for | |-----|-------|--------|----------|-------------|----------| | | $239/yr | Parasolid (solid) | ⭐⭐⭐⭐ | ✅ | Precision hard surface | | Nomad Sculpt | $15 (one‑time) | Custom (mesh) | ⭐⭐⭐⭐⭐ | ❌ (only OBJ/STL) | Organic/artistic | | Plastiz | Free + $5 pro | Boundary rep | ⭐⭐⭐ | ✅ (limited) | Quick sketches | | Onshape | Free (public) | Parasolid (cloud) | ⭐⭐ | ✅ | Full parametric + collaboration |