A/B Test Subject Lines

Subject Line A: Last chance - Offer expires tonight
Subject Line B: Only [X] hours left to save [X]%
Subject Line C: This deal disappears at midnight
Subject Line D: Final reminder - Do not miss out

Best for: Flash sales, limited-time offers, expiring deals
Tip: Test urgency vs. FOMO vs. direct deadline language

Subject Line A: The one thing most [role] get wrong about [topic]
Subject Line B: I was wrong about [topic]
Subject Line C: This surprised me about [industry]
Subject Line D: Open this if you [pain point]

Best for: Content emails, newsletters, educational content
Tip: Curiosity gaps work best when the content delivers on the promise

Subject Line A: {{cursor}}, I made this for you
Subject Line B: A quick question for you, [Name]
Subject Line C: [Company], you are missing out on [benefit]
Subject Line D: [Name], here is your personalized [resource]

Best for: Triggered emails, re-engagement, personalized offers
Tip: Use first name in subject sparingly - overuse reduces effectiveness

Subject Line A: Save [X] hours this week with this one trick
Subject Line B: How to [achieve result] in [timeframe]
Subject Line C: The fastest way to [desired outcome]
Subject Line D: [X] [role] swear by this [tool/method]

Best for: Product emails, feature announcements, how-to content
Tip: Lead with the outcome, not the feature

Subject Line A: Are you making this [topic] mistake?
Subject Line B: What would you do with [X] extra hours?
Subject Line C: Ready to [achieve goal]?
Subject Line D: Have you tried [new approach] yet?

Best for: Educational content, product introductions, surveys
Tip: Questions that touch on pain points tend to outperform

Subject Line A: [X] ways to [achieve result] this week
Subject Line B: We analyzed [X,000] [things] - here is what we found
Subject Line C: [X]% of [role] do not know about this
Subject Line D: [X] minutes to [benefit]

Best for: Listicles, research-backed content, quick tips
Tip: Odd numbers tend to outperform even numbers in subject lines

Subject Line A: [X,000] teams already switched - here is why
Subject Line B: Why [Notable Company] chose [Product]
Subject Line C: Join [X]+ [role] who [action]
Subject Line D: [Expert Name] recommends this for [topic]

Best for: Case studies, testimonials, product launches
Tip: Specific numbers and recognizable names boost credibility

Subject Line A: Your weekly dose of [topic] is here
Subject Line B: New drop alert - [Product/Content]
Subject Line C: [Relevant emoji] You unlocked a surprise
Subject Line D: Warning - This email contains [benefit]

Best for: B2C emails, younger audiences, casual brands
Tip: Use max 1 emoji per subject line; test emoji vs. no emoji