Option A: ChatGPT: builds the matrix and drafts the reply
Best when: You want one assistant for both stages in one place.
What it does: ChatGPT maps and drafts; you check both stages.
Strong at: One conversation keeps the same material in view throughout.
Limit: Analysis accuracy is not proven; check the matrix line by line.
Free plan: Yes, limited (uploads and analysis capped)
Option B: Coda: drafts the reply from your hand-built matrix
Best when: You want the question mapping fully in your own hands.
What it does: You build the matrix; Coda drafts the reply.
Strong at: The tool writes only from your checked matrix.
Limit: No machine cross-check on your matrix; a misread flows through.
Free plan: Yes, limited (1 GB attachments per doc)
Option C: Gemini Notebook: cited matrix, drafted reply, support check
Best when: You want every matrix line tied to a source passage.
What it does: AI builds the matrix and drafts; you check citations.
Strong at: Each matrix line carries a citation you can open.
Limit: Citations cover most questions, not every response; check each line.
Free plan: Yes