Tool • Email & automation

AI subject line generator for newsletters, launches & flows

Turn email ideas into stronger subject lines in seconds. Add your topic, choose a goal and generate multiple subject line options you can A/B test across campaigns and automations.

The AI subject line generator is included with Stratboost. Connect it to Ella, your templates and workflows so every send fits into a bigger lifecycle strategy.

Stratboost • AI subject line generator

Launch subject lines Nurture & welcome flows Win-back & promos Plain-text newsletters A/B test variants

Use one email idea to generate multiple subject lines, then track which styles perform best over time inside Ella.

How it works

Generate subject lines in three simple steps

You don’t need fancy copy formulas. Give the generator a bit of context about the email, and it turns that into clear, testable subject lines that match your brand.

  1. Describe the email. Add a quick summary like “cart open email”, “weekly newsletter with 3 tips” or “win-back offer for inactive customers”.
  2. Set the goal and tone. Choose if you want more opens, clicks or replies. Pick a tone like calm, direct, playful or premium so the subject lines fit your brand.
  3. Generate and shortlist. Stratboost suggests multiple subject lines and preview text options. Keep your favourites, tweak a few words and send or A/B test them from Ella.

Inside Stratboost, the subject line generator can pull from your offers and audience stored in Stratmind so each variation stays aligned with your positioning.

See it in action

Example subject lines this tool can generate

Here are a few sample sets for different types of emails. Each one balances clarity with curiosity and finishes the job in the inbox instead of relying on clickbait.

Ecommerce brand — product launch email

Input: “Launch email for new summer collection, focus on light fabrics and everyday wear.”

1) Your new summer uniform just dropped ☀️
2) Light, breathable & made for real days out
3) The pieces you’ll actually wear all season
4) Meet the summer collection (before it sells out)
5) New arrivals for warm days & late nights
            

Creator / coach — weekly newsletter

Input: “Weekly email with 3 content tips for online coaches, friendly but direct tone.”

1) 3 content tweaks for more clients this month
2) Stop posting daily. Do this instead.
3) The content plan I wish I had when I started
4) Before you post again, read this email
5) One small change = better leads from your content
            

Agency — case study & call booking email

Input: “Case study email about client going from 3 to 27 calls per month, confident tone.”

1) How we took this agency from 3 to 27 calls a month
2) The 30-day pipeline fix that changed everything
3) From “no calls” to a full calendar (real story)
4) What happened when we rebuilt this funnel
5) Want 27 calls a month? Start here.
            

Simple rules that work

Tips for getting better subject lines with AI

  • Lead with the outcome. Tell the generator what the reader gets from opening, not just what’s inside the email.
  • Mention the audience. Adding “for ecommerce brands” or “for busy founders” helps the tool write clearer, more specific lines.
  • Set a clear goal. Say if you want opens, clicks, replies or bookings. The AI will adjust how direct or curious the line is.
  • Avoid fake urgency. Use real constraints (“cart closes Friday”, “5 seats left”) instead of empty urgency. Your list will trust you more.
  • Test small variations. Change one element at a time — like the lead word or the level of curiosity — and track which style wins.

Part of your full email system

Use the subject line generator inside Stratboost

On its own, this is a fast way to write subject lines. Inside Stratboost, it becomes part of a full email and lifecycle system powered by Ella and Stratmind.

  1. Store your brand once in Stratmind. Add your audience, offers and tone so subject lines match your positioning from day one.
  2. Draft emails with AI Email Writer. Use the AI Email Writer to create the body, then ask this tool to generate matching subject lines and preview text.
  3. Send and automate with Ella. Plug your subject lines into Ella’s campaigns and flows so broadcasts and automations stay consistent.
  4. Connect to workflows. Use workflows like the AI Product Launch or AI Email Nurture System to keep each subject line tied to a clear journey.
  5. Measure and refine over time. Track open rates across campaigns so you can see which subject line patterns your audience responds to best.

Quick questions

FAQ about the AI subject line generator

Do I need Stratboost to use these subject line ideas?

You can copy the example structures from this page into any email platform. Inside Stratboost, the generator sits next to Ella and AI Email Writer so you can draft, test and track everything in one system.

Will this work for my industry?

Yes. The tool takes in your niche, audience and offer details, then adapts the language. You can use it for ecommerce, SaaS, coaching, agencies, local businesses and more.

Can I control how “salesy” the subject lines feel?

You can tell the generator how direct or soft you want to be — for example “soft, educational”, “bold launch” or “plain-text founder update”. It will adjust style and intensity to match.

Does it only handle single campaigns?

No. You can also use it to write subject lines for full sequences, like welcome flows, launch campaigns, win-back automations and evergreen nurture emails.

Build the full email stack

✨ Built for founders, creators, ecommerce brands and agencies

Use the AI subject line generator and send emails with confidence

Stop guessing your subject lines. Turn each email idea into multiple options, test what works and build an email system that compounds over time instead of relying on one-off campaigns.

Create your Stratboost account →

Start with your next newsletter, then roll the same system out across launches, flows and automated journeys.