Recommendation (short):
Use ChatGPT to produce structured draft bundles (title, subtitle, full body as HTML/markdown, TL;DR, and a "verifiable claims" list). Store drafts in a table or Google Drive and only trigger your Zapier workflow to Substack when you manually mark a draft "Ready to publish." That keeps automation safe while saving time.

Why this works:
- You keep human editorial control (you edit the draft) and only automate the final push.
- A structured draft makes it easy to build Zapier actions or webhooks that post cleanly to Substack.

Best prompts (use as templates)
1) Draft generator (replace bracketed items):
"Write a newsletter draft for [audience] on [topic]. Include: 1) a short, punchy subject line ( Substack API; if not, trigger a prepared email or Slack message you paste into Substack manually.
- Skill: webhooks/APIs require moderate technical comfort. If you’re non-technical, trigger a manual confirmation email from Zapier with the final HTML.
- Output quality: the more important the accuracy, the more human verification steps you should keep.

Practical checklist (implementation)
1) Create ChatGPT prompt templates (draft, claims list, QA).
2) Save drafts to a single system (Airtable/Google Drive/Notion) with a "Ready to publish" field.
3) Build Zapier: Trigger = status change; Action = Webhooks POST to Substack API OR Action = send you the final HTML for manual paste.
4) Always run/verifiy the "verifiable claims" list before flipping Ready.
5) Keep a human-check record (URL + checker + timestamp).

Best-for / Avoid-if
- Best for: solo creators who want speed + control.
- Avoid if: you need fully hands-off publishing or are publishing legally sensitive claims without a proper fact-check workflow.

If you want, I can write the exact ChatGPT prompts as copy-paste-ready text or a Zapier trigger/action checklist next.

Compare ChatGPT and Gemini