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SEO & Marketing

Cold Email Subject Line Tester

Analyze your cold email subject lines for length, spam triggers, and personalization. Preview exactly how your email will look on an iOS mobile lock screen.

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Mobile Lock-Screen Simulator

80% of cold emails are judged and deleted directly from a phone's lock screen. Use the simulator on the right to see exactly how your subject line and preview text will truncate on an iPhone before you hit send.

09:41
Monday, October 14
Mail
now
John Doe
Subject line will appear here
The first line of your email will appear here. It's just as important as the subject line.

What is the Cold Email Subject Line Tester?

Score your subject lines and preview exactly how they will truncate on an iOS Lock Screen before you hit send. This tool is designed to be fast, free, and completely secure, running entirely in your browser without uploading your sensitive data to external servers.

How to use the Cold Email Subject Line Tester

  1. Select or configure your input settings.
  2. Upload your file or paste your data into the tool.
  3. Click the primary action button to instantly generate your results.
  4. Download or copy your completely processed output.

Related Search Terms

cold email subject line testeremail subject line analyzerios email lock screen previewspam trigger word checkermobile email previewer

Frequently Asked Questions

Why is the lock-screen preview important?+

80% of cold emails are read on mobile devices. If your subject line and preview text are too long, they will be cut off, ruining the hook.

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