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Your email’s fate is often decided in just a few words—your subject line

We fed Zenie AI hundreds of thousands of email subject lines with above 60% open rates to get you the ultimate, free subject line tester!

Type your best subject lines and analyze their health scores here

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Your subject line scored a

75

Out of 100

Detailed Analysis

Subject Line Success Factors

Your subject line checklist for getting emails opened, read, and clicked. Each factor directly impacts your open rates and engagement.

Length

3/10

4–6 words are recommended for optimal display on mobile devices.

Exp.: "Last Chance: Save 20% on Your Annual Subscription"

...

Personalization

3/10

Incorporate tokens (e.g., {first_name}) to create a tailored message.

Exp.: "{first_name}, Your Custom Report is Ready"

...

Spam Triggers

3/10

Avoid words that commonly trigger spam filters

Exp.: free, guaranteed, act now, money-back, no cost, urgent

...

FOMO Elements

3/10

Incorporate phrases that evoke urgency and exclusivity

Exp.: Last chance, final call, ending soon, don’t miss out

...

Capital Letters

3/10

Avoid full capitalization or overuse in key words

Exp.: AMAZING DEAL INSIDE! DON'T MISS OUT!

...

Exclamation Marks

3/10

Limit exclamation marks to one (or none) to avoid spammy appearance.

Exp.: Hey folks!, Don’t miss out this offer!!

...

Emoji Use

3/10

Use emojis sparingly and only when they support the message

Exp.: 📊 Your Monthly Analytics Report

...

Word Count

3/10

Aim for 4–9 words to ensure clarity and impact

Exp.: Join Our Exclusive Webinar on Digital Marketing

...

Readability & Sentiment

3/10

Use NLP to assess clarity and tone.

Exp.: Need to update

...

Negative Words

3/10

Avoid language that creates a negative impression

Exp.: Problem, fail, failure, disappoint, disappointment, bad, waste

...

But there’s more! Zenie AI has analyzed  what gets opened in millions of inboxes to get you below subject lines for inspiration

Cyber Monday

Black Friday

Christmas

Valentine's Day

Mother's Day

Father's Day

Abandoned cart

Welcome

Sale

New collection

Limited-time offer

Thanksgiving

Diwali

New year

Independence

Don't miss out our BOGO sale!

92%

copied

Black Sale. New arrivals 30% off!

92%

copied

💥 25% Black Friday Code: FRIDAY

92%

copied

Black Friday is back!🔥 Shop now!

92%

copied

🚨 BLACK SALE! Bestsellers 45% off!

92%

copied

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Your email’s fate is often decided in just a few words—your subject line

Your subject line scored a

75

Detailed Analysis

Subject Line Success Factors

Length

3/10

Personalization

3/10

Spam Triggers

3/10

FOMO Elements

3/10

Capital Letters

3/10

Exclamation Marks

3/10

Emoji Use

3/10

Word Count

3/10

Readability & Sentiment

3/10

Negative Words

3/10

But there’s more! Zenie AI has analyzed what gets opened in millions of inboxes to get you below subject lines for inspiration

If you liked those subject lines & the subject line tester, you might also like a few other tricks from Zenie AI.

Build & take campaigns live in minutes

Subject Lines That Sell

Guarantee conversions with help from Zenie AI

Try ZEPIC's Email Marketing Platform for free for 14 days

In the Spotlight

Length

3/10

Sales & Promotional Triggers:

Sales & Promotional Triggers:

Sales & Promotional Triggers:

But there’s more! Zenie AI has analyzed  what gets opened in millions of inboxes to get you below subject lines for inspiration

Build & take campaigns live  in minutes