Most CAD review tools either cost $200+/month or are just viewers with no collaboration. Revievv does both - 3D STEP/STL viewer with design review built in. Pin comments directly on 3D model surfaces, not on screenshots. Share a link - reviewers don't need CAD software, an account, or any installation. Unlimited free reviewers on every plan, including the free tier. Everything runs in the browser. Upload a file, collect feedback, export annotated PDF. Takes 30 seconds to start.
