Pen — Your AI Drawing Assistant

After an AI review, you often have follow-up questions. Tag @pen in any comment to get answers grounded in your drawing.

Meet Pen

Pen — ClearHandoff's AI assistant

Pen is ClearHandoff's AI drawing assistant. Pin a comment on your drawing, tag @pen, and Pen answers with full context of the drawing, the AI review findings, and where your pin sits on the sheet.

How to use Pen

  1. Upload a drawing and run an AI Review.
  2. Pin a comment on any feature, or reply to an existing comment or review.
  3. Include @pen in your message.
  4. Pen replies in the thread within a few seconds, in the same language you wrote in.

Pen needs an AI Review to have run on the current drawing version first — that's what gives Pen the context to answer well. Learn about AI Review.

Example questions

Here are a few things engineers ask Pen:

  • “Is our laser cutter precise enough that we can achieve this tolerance?”
  • “Our CNC mill is broken — which alternative methods could we use to manufacture the part?”
  • “What tolerance would you recommend for this bore?”
  • “Is this feature fully dimensioned?”
  • “What does this GD&T frame mean?”
  • “What surface finish is reasonable for this bearing seat?”

What Pen can see

  • The page your comment is pinned on — all views and text on that page
  • All comments and reviews on the drawing
  • The review profile used for the AI Review
  • The exact location of your pin, when you pinned the comment

What Pen can't see

  • Other pages of the drawing
  • Other drawings in your account
  • External documents, CAD files, or 3D models
  • Earlier drawing versions, unless the comment was carried over

Limits

  • 20 questions per drawing, shared across all threads and users on that drawing.
  • Pen replies in the same language as your question (English, German, Dutch, …).
  • No extra cost — questions to Pen are included with your AI Review.

ClearHandoff

AI-powered drawing review

© 2026 SankeyArt GmbH

ClearHandoff is a product of SankeyArt GmbH.

support@clearhandoff.com

Contact

Andreas Haselsteiner

Andreas Haselsteiner

Managing Director