Nightroll

Free AI Email Subject Line Generator

Paste your email and get five subject lines that get it opened.

⚠️ AI can be wrong, and smaller or free models get things wrong more often. Check anything important before you rely on it.

💸 = sends one request to OpenRouter, billed to your account (free models cost nothing). Nothing is sent while you type.

Your text stays in this tab and goes to OpenRouter only when you click a 💸 button. Nightroll keeps nothing, but OpenRouter and the model provider have their own data retention rules.

AI privacy

How to make subject lines

  1. Connect your OpenRouter account once in the AI settings.
  2. Paste your email and, optionally, who it is for.
  3. Click the 💸 button. Only then is your request sent to OpenRouter; copy the result or try again.

Frequently asked questions

What does it cost?
Nightroll is free. Each click on a 💸 button sends one request to OpenRouter, which charges your account for the model you chose (usually a fraction of a cent for text), or nothing with a free model. The cost is shown under the result. Nothing is ever sent while you type.
Is my text stored?
Not by Nightroll. It stays in this tab and goes from your browser to OpenRouter and the model provider only when you click, and their policies apply. By default only providers that do not store or train on prompts are used.