Option A: ChatGPT: drafts and re-checks the slot table, you check
Best when: Constraints already sit in tables and you want a pre-checked draft
What it does: ChatGPT drafts and re-checks the table; you and the owner check
Strong at: The tool re-checks its own draft before you review it
Limit: Not confirmed to match slots or check buffers; test a small sample
Free plan: Yes, limited (file uploads, images, voice and Codex)
Option B: Claude: drafts the schedule grid and lists clashes
Best when: You want the tool to draft and find clashes while you check
What it does: Claude drafts the grid and clash list; you and the owner check
Strong at: One rules sheet can be reused across several grid checks
Limit: Grid placement and breach-finding not confirmed; check every flag
Free plan: Yes, limited (usage caps reset every five hours)
Option C: Gemini Notebook: drafts the schedule, each clash cited
Best when: Rules are scattered across documents and you want each clash cited
What it does: Gemini Notebook drafts with citations; you and the owner check
Strong at: Citations quote the source, giving a path from clash to rule
Limit: Answering from sources confirmed, not building schedules; check drafts
Free plan: Yes, limited (usage caps, 100 notebooks, 50 sources)