ETS Proofwriter service

ETS recently launched the "Proofwriter" online writing evaluation tool, marketed to student end-users. This appears to be derived from the full-featured Criterion service that is marketed to institutions and includes rosters, assignment creation, individual and class assessment, message boards, custom annotations to augment the system comments, etc. (see video demo of Criterion) . I can't tell if these ETS products flag for potential plagiarism, like the SafeAssign and turnitin modules available with Blackboard.