Email Subject Lines: 100+ Examples That Actually Get Opens

Your email subject line determines whether your email gets opened or ignored. With the average person receiving 100+ emails daily, you have seconds to earn that click.

This guide gives you the formulas, examples, and strategies to write subject lines that consistently get opens. No fluff—just what works.

Subject Line Fundamentals

Optimal Length

Device	Character Limit	Recommendation
Desktop	~60 characters	40-50 ideal
Mobile	~35-40 characters	Front-load key words
Preview text	~40-90 characters	Extend your message

Rule of thumb: 30-50 characters for best performance across devices.

Core Principles

1. Clarity over cleverness — Clear value beats creative wordplay
2. Specificity wins — Numbers and details outperform vague promises
3. Create curiosity — But always deliver on the promise
4. Match the content — Misleading subjects destroy trust

10 Proven Subject Line Formulas

1. The Number Formula

Pattern: "[Number] [things] to [achieve benefit]"

Examples:

• "5 ways to double your email open rates"
• "7 mistakes killing your conversion rate"
• "3 templates we use for every launch"
• "10 subject lines that got 50%+ opens"

Why it works: Numbers are specific, promise discrete value, and are easy to scan.

2. The How-To Formula

Pattern: "How to [achieve desired outcome]"

Examples:

• "How to write emails that actually get read"
• "How to recover 20% of abandoned carts"
• "How to grow your list to 10K subscribers"
• "How to get more opens without being clickbait"

Why it works: Promises actionable knowledge, attracts intent.

3. The Question Formula

Pattern: "[Question about their challenge]?"

Examples:

• "Struggling with low open rates?"
• "Is your email list growing?"
• "Ready to automate your marketing?"
• "What's killing your email conversions?"

Why it works: Creates engagement, feels personal.

4. The Curiosity Gap

Pattern: "[Statement that creates incomplete loop]"

Examples:

• "The email mistake 90% of marketers make"
• "Why your best customers aren't buying"
• "We tried this and here's what happened"
• "The trick that doubled our opens"

Why it works: Brain wants closure, must open to complete the loop.

5. The Personalization Formula

Pattern: "[Name], [relevant statement]"

Examples:

• "Sarah, your weekly report is ready"
• "Tom, we noticed you left something behind"
• "Lisa, exclusive offer for you"
• "[Name], quick question"

Why it works: Personal attention stands out in crowded inbox.

6. The Urgency Formula

Pattern: "[Time element] + [benefit/offer]"

Examples:

• "Last chance: 50% off ends tonight"
• "Only 3 spots left in the workshop"
• "24 hours to claim your bonus"
• "Ends at midnight: Free shipping"

Why it works: Creates FOMO, demands immediate attention.

7. The Social Proof Formula

Pattern: "[Authority/numbers] + [outcome]"

Examples:

• "How Nike increased email revenue 40%"
• "The strategy 500+ marketers use"
• "What top creators do differently"
• "Join 10,000+ subscribers"

Why it works: Leverages credibility and popularity.

8. The Benefit-First Formula

Pattern: "[Benefit achieved] in [timeframe]"

Examples:

• "Better emails in 60 seconds"
• "Double your subscribers this month"
• "Launch-ready emails in minutes"
• "10x your open rates this week"

Why it works: Leads with what they get, adds urgency with time.

9. The Announcement Formula

Pattern: "[New/Introducing/Announcing]: [thing]"

Examples:

• "New: AI-powered email creation"
• "Introducing our biggest update yet"
• "Announcing: Free email templates"
• "Just launched: [Feature name]"

Why it works: News is inherently interesting, suggests value.

10. The Direct Formula

Pattern: "[Exactly what the email contains]"

Examples:

• "Your invoice for November"
• "This week's best articles"
• "Your account summary"
• "Quarterly business review"

Why it works: Sometimes direct clarity is the best approach.

100+ Subject Line Examples by Category

Welcome Emails

• "Welcome to [Brand] — here's your gift"
• "You're in! Let's get started"
• "Welcome [Name] — 15% off inside"
• "Thanks for joining — what's next"
• "Your [Brand] journey starts now"
• "Welcome! Here's what to expect"

Promotional Emails

• "50% off everything — today only"
• "Your exclusive member discount"
• "The sale you've been waiting for"
• "Early access: Spring collection"
• "[Name], you've unlocked VIP pricing"
• "Flash sale: 4 hours only"
• "Buy one, get one free (today)"

Abandoned Cart Emails

• "You left something behind..."
• "Still thinking it over?"
• "Your cart is waiting (+ 10% off)"
• "Did something go wrong?"
• "Complete your order — free shipping"
• "Don't miss out on [Product]"
• "Your cart expires in 24 hours"

Newsletter/Content

• "This week: 5 must-read articles"
• "The [industry] news you need"
• "What we learned this month"
• "[Topic] trends you can't ignore"
• "Your weekly dose of [topic]"
• "The best of [Month]"

Re-engagement

• "We miss you, [Name]"
• "It's been a while..."
• "Come back? Here's 20% off"
• "Are we breaking up?"
• "Last chance to stay connected"
• "We've got something new for you"

B2B

• "[Name], quick question"
• "Ideas for [Company]"
• "Following up on our conversation"
• "Resource you might find useful"
• "Thought of you when I saw this"
• "[Company] + [Your Company]"

Product Launch

• "It's finally here: [Product]"
• "You asked, we built it"
• "Meet the new [Product]"
• "Exclusive first look inside"
• "The wait is over: [Product] is live"
• "Introducing [Product Name]"

Seasonal

• "Your Black Friday early access"
• "New year, new [benefit]"
• "Summer's here — so are savings"
• "Spring cleaning for your [problem]"
• "Holiday gift guide inside"

A/B Testing Subject Lines

What to Test

1. Length — Short vs. long
2. Personalization — Name vs. no name
3. Emoji — With vs. without
4. Tone — Formal vs. casual
5. Format — Question vs. statement
6. Urgency — With deadline vs. without

Testing Best Practices

• Test one element at a time
• Need 1,000+ recipients per variant for significance
• Wait 2-4 hours before calling winner
• Document results for patterns

Example Test Plan

Week	Test Element	Variant A	Variant B
1	Personalization	With name	Without
2	Length	Short (5 words)	Long (10 words)
3	Format	Question	Statement
4	Urgency	With deadline	Without

Subject Line Mistakes to Avoid

1. ALL CAPS

Looks spammy, triggers filters, feels aggressive.

2. Excessive Punctuation!!!

Desperation isn't attractive. One exclamation max.

3. Misleading Promises

Opens mean nothing if content doesn't match. Destroys trust.

4. Generic Phrases

"Check this out" — check what? Be specific.

5. Too Clever

If they don't understand, they won't open.

6. Spam Trigger Words

"Free," "act now," "limited time" in excess can hurt deliverability.

Using AI for Subject Lines

AI can help with:

• Generating variations quickly
• A/B test options
• Consistency at scale
• Overcoming writer's block

Brew generates subject lines automatically when creating emails, with options for A/B testing.

Subject Line Checklist

Before sending, verify:

• Under 50 characters (or key info front-loaded)
• Clear value or curiosity
• Matches email content
• Not misleading
• No spam trigger overload
• Tested on mobile
• A/B variant created

Start Writing Better Subject Lines

Subject lines are the gateway to everything else. Master them and your entire email program improves.

Ready to improve your opens? Try Brew free and let AI help you write subject lines that convert.

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