Option A: Claude: writes the explanation from your source
Best when: You want a complete first draft fast
What it does: Claude drafts it all; you check the reasoning
Strong at: One chat gives map, example and self-check
Limit: You check the arithmetic and counterexample yourself
Free plan: Yes, limited (5-hour and weekly usage caps)
Option B: Gemini Notebook: explanation pinned to your source
Best when: You must stay faithful to the course wording
What it does: Gemini Notebook drafts with citations; you check them
Strong at: Map and explanation stay tied to source passages
Limit: Notebooks are independent; the source does not carry over
Free plan: Yes, limited (notebook and source caps)
Option C: ChatGPT: drafts the study package from your source
Best when: You want a draft you can make your own
What it does: ChatGPT drafts and polishes; you check and rewrite
Strong at: Gives a clearer second version of your checked package
Limit: You must re-derive the examples yourself
Free plan: Yes, limited (uploads and data analysis)