Intempt
Email & Outreach

Free AI Email Subject Line Generator

Generate 10 email subject lines with preheader text, spam risk flags, and emotional angle labels. Maximize open rates with AI-optimized copy.

Generate Subject Lines
How It Works

Three simple steps

Step 1

Describe your email

Tell us what the email is about and select your primary goal.

Step 2

AI generates 10 options

Get 10 subject line + preheader pairs with spam risk flags and emotional angles.

Step 3

Pick and send

Choose your favorites. Use Intempt Studio to A/B test and send the winner.

2 of 2 free generations remaining

Example

Sample Output

Here's what the Email Subject Line Generator produces

Purpose: Promote new AI analytics feature launch Audience: B2B SaaS marketers

1.

  • Subject: Your dashboard just got smarter
  • Preheader: Predictive analytics is live — no setup required.
  • Chars: 33 | iPhone: Full | Gmail: Full | Outlook: Full
  • Spam Risk: Clean
  • Angle: Benefit

2.

  • Subject: Predict next month's pipeline today
  • Preheader: New forecasting dashboard ready for your team.
  • Chars: 36 | iPhone: Full | Gmail: Full | Outlook: Full
  • Spam Risk: Clean
  • Angle: Urgency

3.

  • Subject: We built the dashboard you kept requesting
  • Preheader: Predictive analytics, custom dates, one-click exports.
  • Chars: 45 | iPhone: Truncated | Gmail: Full | Outlook: Full
  • Spam Risk: Clean
  • Angle: Social Proof

4.

  • Subject: 5-minute setup. Months of insight.
  • Preheader: Connect your data, get predictions before lunch.
  • Chars: 34 | iPhone: Full | Gmail: Full | Outlook: Full
  • Spam Risk: Clean
  • Angle: Benefit

5.

  • Subject: What will your numbers look like in 90 days?
  • Preheader: Our predictive model answers that with your real data.
  • Chars: 46 | iPhone: Truncated | Gmail: Full | Outlook: Full
  • Spam Risk: Clean
  • Angle: Question

(6-10 follow same format)

Top 3 Picks:

  1. #4 "5-minute setup. Months of insight." — Concrete time contrast creates instant value perception. Period-separated fragments boost scannability.
  2. #1 "Your dashboard just got smarter" — Shortest, directly addresses benefit. Preheader adds specificity.
  3. #2 "Predict next month's pipeline today" — Time compression creates urgency without being pushy.

A/B Test: #4 vs. #1 — Tests positive framing (gain) vs. capability announcement. Reveals whether audience is motivated by saving time or gaining new power.

Personalization Variant:

  • Original: "5-minute setup. Months of insight." (34 chars)
  • Personalized: "{{first_name}}, 5-min setup. Months of insight." (48 chars)
  • iPhone: Truncated — consider: "{{first_name}}, predict your pipeline" (39 chars, full display)

Frequently Asked Questions

Each subject line gets rated Low, Medium, or High based on known spam trigger patterns. Stick with Low-risk options for maximum deliverability.

This tool includes scarcity and social-proof angles in addition to the standard set, since marketing emails often use these conversion-focused hooks.

You can use Intempt Studio's built-in A/B testing to send two variants and automatically deliver the winner to the rest of your list.

Yes. Subject lines are kept under 50 characters and preheader text under 90 characters to display properly on mobile devices.

2 free generations (20 subject line pairs total). Sign up for Intempt for unlimited access.

Ready for the full toolkit?

This free tool generates one output at a time. Intempt Studio gives you unlimited AI generations, A/B testing, and a full customer data platform.

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Free plan includes 100 credits. No credit card required.

Free Email Subject Line Generator | Intempt