Email prompt builder

Campaign inputs

AI Quick Brief — describe your campaign and let AI fill in the fields below

Campaign description

Brand *

Product / offer *

Audience (optional)

Objective

Creative style

Primary action goal (optional)

Brand context (optional)

Informational points (optional)

Campaign notes (optional)

CTA label suggestion (optional)

Used as directional guidance for the CTA wording, not exact button text.

Link placeholder

Tone (optional)

Variation seed

Same seed keeps the same prompt recipe. New seed = new prompt wording, structure, and variation rules.

Preset

Prompt blocks Include HTML structure rules (tables, inline CSS) Include uniqueness / variation instructions (uses seed) Include 2–4 paragraphs of brand/product context (history, story, mission, heritage)

Output target

Your instructions (appended verbatim)

Fast path: enter brand + offer, then optionally audience and creative style. The builder will infer a stronger creative route for you.

Generated prompt

Prompt review

Reviewing…

Creative preview

Preview provider

Model override (optional)

Add API keys in Settings, then generate a preview here.

Subject line suggestions

Deliverability review

Saved prompts

Store snapshot prompts you want to revisit, compare, or reload into the builder.

Import JSON

API settings

Keys and defaults are saved on this local server on this Mac.

OpenAI API key

Default ChatGPT model

DeepSeek API key

Default DeepSeek model

Preview temperature

Preview max tokens

How preview works

The app sends your saved key and current prompt to the local server running on this Mac, which forwards the request to OpenAI or DeepSeek and returns the generated HTML so you can inspect it.

Your prompt builder still works without any API keys.
Preview uses the current prompt exactly as shown in the Builder tab.
The saved prompt library is stored on the local server (survives browser changes).
Export/import JSON from the Saved tab to migrate prompts between machines.

Keep the server running

To run the server in the background so it stays up after closing the terminal, install pm2 and run:

npm install -g pm2
pm2 start server.mjs --name prompt-maker
pm2 save && pm2 startup