Describe a tool. Get a single HTML file holding its setup questionnaire and a full ready-to-use command. It runs offline, carries your branding only, and works with whatever chat AI your buyer already has.
The setup questions your tool needs, with sensible defaults already selected. Your buyer edits what matters and leaves the rest.
Thousands of words of behavioural spec: the method, the required output structure, the quality rules, the guardrails that stop it inventing facts.
No network requests, no fonts to fetch, no account to create, no server to pay for. It opens from a hard drive.
Your name, your accent color, your product link. The file mentions no platform and no studio.
On 16 August 2026 OpenAI closed custom GPT creation to every personal ChatGPT account. Free, Go, Plus and Pro can no longer build or publish one; that now needs a managed Business, Enterprise or Edu workspace. Anyone who built a business on publishing GPTs lost the loading dock.
A prompt editor file has no such dependency. It is a document. It cannot be delisted, rate limited, or moved behind a workspace plan, and it works in any chat AI your customer already pays for, including the free tiers.
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