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Email preheader optimiser.
The slot next to your subject line, used properly.

The preheader is the most-leaked email feature. Half of senders accidentally show "view this email in your browser"to every recipient. Paste your subject + preheader — we'll render the mobile inbox preview and score across length, joint cap, duplication, generic openers, value cue, personal pronouns, and that infamous browser-leak. Pairs with /tools/subject-line-scorer.

17 chars
58 chars · combined with subject: 78 chars
Mobile inbox preview
From: you@yourdomain.com
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We packaged the 7 hooks that doubled our open rate inside.
Preheader score
95
/ 100
Good
  • 58 characters — fits cleanly in the mobile preview slot.
  • Includes a value cue — names the why-open in plain words.
  • No 'you' / 'your' — the snippet reads as written for the list, not the reader.

Vyrable's email engine auto-generates the preheader from your post body — different angle than the subject, the right length, no "view in browser" leak. Connect Brevo, Resend, SendGrid, Postmark, or Mailgun.