EmailSubjectTester
Spam triggers, mobile preview, sentiment, and AI variants.
Everything runs in your browser — nothing is sent anywhere
Subject line
Preheader (optional)
0Characters
0Emoji
0Spam triggers
—Sentiment
Inbox preview
Desktop — ~70 characters visible
Your Brand
Your subject appears here
— your preheader continues here…
AmazonYour order has shipped— Arriving Thursday
Mobile — ~35 characters visible
Your Brand
Your subject appears here
Your preheader here…
Spam trigger words found
AI variants