MarketingSandbox · bring your own key

Test “Upsell 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)

Write a persuasive upsell email for the following scenario:

Customer name: {{customer_name}}
Current product they use: {{current_product}}
Product to upsell them to: {{upsell_product}}
{{benefit_line}}
{{offer_line}}

Write a concise, professional, and persuasive email that:
1. Acknowledges their current use of {{current_product}}
2. Naturally transitions to the value of {{upsell_product}}
3. Includes a clear call-to-action
4. Is warm but not pushy
5. Is under 200 words

Return only the email text (subject line + body), nothing else.

Output — will stream here

Nothing yet. Fill in variables and click Run.

Prompt slug: upsell-email

Prefer copy-paste? Back to the prompt page →