MarketingSandbox · bring your own key

Test “Product Update Email” with your own key

Paste an Anthropic, OpenAI, or OpenRouter key. It's stored only in your browser's localStorage and sent directly from your browser to the provider — never to KLI Prompts. We have no backend that can see it.

How this works (honestly)

  • Your key lives in localStorage on this device only.
  • The HTTP request to the LLM goes from your browser straight to api.anthropic.com / api.openai.com / openrouter.ai.
  • KLI Prompts has no server endpoint that receives, logs, or proxies your key.
  • Clear it any time — there's a button below.

Step 1 · Provider

Recommended for this prompt: any · temperature 0.4

Step 2 · Your API key

Saved to localStorage on this device. Never sent to KLI servers.

Step 3 · Fill the variables

Final prompt (sent to anthropic)

You are an expert product marketer. Write a product update email for the following release.

Product: {{product_name}}{{version_line}}
{{audience_line}}
Tone: {{tone_description}}

New features in this release:
{{new_features}}{{improvements_section}}

Write a complete product update email. Return ONLY valid JSON with two fields:
- "subject": a compelling email subject line (max 80 characters)
- "body": the full email body as plain text (use line breaks for formatting, no HTML)

Respond with only the JSON object, no markdown, no extra text.

Output — will stream here

Nothing yet. Fill in variables and click Run.

Prompt slug: product-update-email

Prefer copy-paste? Back to the prompt page →