Hm. I read a review (https://all3dp.com/1/best-free-online-cad-software/) that listed Clara.io as "Best Free Online CAD Software Tool for: Intermediate users working on ambitious and collaborative projects."
Claims to import and export "anything". (I noted in the review that it claimed to import .SAT "Formats
3dm, 3ds, cd, dae, dgn, dwg, emf, fbx, gf, gdf, gts, igs, kmz, lwo, rws, obj, off, ply, pm, sat, scn, skp, slc, sldprt, stp, stl, x3dv, xaml, vda, vrml, x_t, x, xgl, zpr"), but....
Try to import a .SAT file ... FAIL.
Try to import a .STEP file.... says it succeeded...name of file appears in tree; nothing visible on screen. 5 views of nothing! ... FAIL.
Try to draw a rectangle (line,circle,spline..). .... FAIL.
Another finger-painters paradise claiming to be CAD. Yawn.