Learn how to interpret your analyzer results and improve your email open rates
The overall score is a combined metric (0-100) that represents the overall quality of your email subject line. It takes into account technical aspects, engagement potential, and spamminess.
Excellent - Your subject line is optimized for high open rates
Good - Minor improvements could boost your performance
Average - Consider making several improvements
Below Average - Significant changes recommended
Poor - Major revision needed before sending
Measures the technical quality of your subject line including length, formatting, and structure. A high technical score means your email will display properly on all devices.
Predicts how likely recipients are to open your email based on psychological triggers, curiosity, and emotional appeal. Higher scores indicate stronger reader interest.
Evaluates the likelihood of your email being marked as spam. Lower scores are better - high spam scores can hurt your sender reputation and deliverability.
The total number of characters in your subject line. Optimal range is 30-50 characters for mobile devices, where most emails are opened.
Optimal Range: 30-50 characters
The number of words in your subject line. Most effective subject lines contain 6-10 words.
Emojis can increase open rates when used sparingly (1-2). Too many (3+) can look unprofessional and trigger spam filters.
The emotional tone of your subject line: Positive, Negative, or Neutral. Positive sentiments generally perform better for promotional emails.
How easy it is to understand your subject line at a glance. Higher readability means your message gets across quickly.
Capitalizing first letter of each word - professional and readable
Only capitalizing first word - casual and natural
Writing in all caps is considered shouting and is a major spam trigger.
Inconsistent capitalization - can appear unprofessional
Using recipient data like name, company, or past behavior. Personalized subject lines see 26% higher open rates on average.
Words that trigger emotional responses and increase engagement. These words create urgency, curiosity, or desire.
Examples: Limited, Exclusive, New, Free, Save, Discover, Secret, Premium, Instant, Proven
Words and patterns that increase the likelihood of your email being marked as spam. Avoid these to protect your sender reputation.
Examples: !!!, FREE, 100%, Act Now, Cash, Credit, Deal, Guarantee, Prize, Winner
The analyzer identifies various psychological triggers and writing patterns in your subject line.
Creates a sense of time-sensitivity. Use phrases like "Limited time" or "Ending soon" to encourage immediate action.
Hooks the reader by creating intrigue. Use questions or incomplete statements to make them want to learn more.
Highlights the benefit or value for the reader. Clearly communicate what they will gain by opening.
Asking a question engages the reader's brain. They naturally want to find the answer by opening the email.
Appeals to feelings like excitement, fear, or belonging. Emotional subject lines often outperform logical ones.
The analyzer checks for these common problems that can hurt your email performance.
Subject lines over 50 characters get truncated on mobile. Keep it concise.
Using more than 2 emojis can look unprofessional and trigger spam filters.
Writing in all caps is considered shouting and is a major spam trigger.
Using words like "FREE" or "Act Now" significantly increases spam scores.
Follow these best practices to improve your subject lines.
The most effective subject lines are under 50 characters. Get to the point quickly.
Leave the reader wanting more. Don't give away everything in the subject line.
Specific numbers and details perform better than vague promises.
Your subject line and preview text should work together to tell a complete story.
Try different approaches: questions, urgency, curiosity, or benefit-focused. Test what resonates.
Download the comprehensive PDF documentation containing detailed descriptions of all PHP functions, their parameters, return values, and implementation details. Essential for developers integrating or extending the analyzer.
Use this guide to optimize your subject lines and improve your email marketing results.