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Privacy
Short version: no accounts, no ads, no database. Most tools run entirely in your browser.
What runs in your browser
The subject line tester, all scoring, the spam and power word checkers, the length demo and the open rate calculator run locally on your device. What you type into them is not sent anywhere.
What is sent to AI
When you click a button that generates subject lines, rewrites a line or personalises a template, the text you entered is sent to our server and on to an AI model through Vercel AI Gateway to produce the result. We don't store it or use it to build profiles. Please don't paste confidential or personal data you wouldn't want processed by a third-party AI provider. A per-IP counter is held briefly in memory to prevent abuse and is not logged.
What we store on your device
The generator remembers your last topic, audience and tone, and any subject lines you click “Save” on, in your browser's localStorage. It never leaves your device. You can remove it here:
Analytics
We use Ahrefs Web Analytics to count page views. It is cookieless and doesn't track you across sites.
Last updated 27 September 2026.