Paste your email HTML and see it render instantly in desktop and mobile, light and dark, with a real inbox row showing your sender, subject, and preheader exactly as Gmail and Apple Mail display them. No signup, no test send.
Inbox preview
Rendered email
Rendered locally in a sandboxed frame. No scripts run, nothing is sent, nothing is stored.
The forgotten line
Every inbox shows two lines of copy before anyone opens your email: the subject and the preheader (also called preview text). Most people obsess over the subject and leave the preheader on autopilot, which is why so many emails show "View this email in your browser" or a naked link right in the inbox.
Treat the preheader as an extension of the subject, not a repeat of it. If your subject is "Your trial ends in 3 days", the preheader should add the next beat: "Keep your workspace and everything you built". Together they read like one thought. Use the inbox preview above to see both together, and where each client cuts them off.
What breaks in real inboxes
Meisa pairs clean, tested templates with the deliverability levers that get them seen: subtle per-send variation so filters cannot flag a bulk blast, engaged-first send ordering, and automatic resends to non-openers, all running on your own authenticated sending. Great HTML plus real deliverability is the whole game.
Own your sending. Land in the inbox. 14-day money-back guarantee.
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