05 // Free tool
Free AI subject line generator for ecommerce.
Five high-converting subject lines + preheaders in under ten seconds. Built on the same engine 2,400+ DTC brands use to write emails people actually open.
No signup 5 free batches Brand-voice ready
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Fill the form. Get five subject lines + preheaders.
06 // The playbook
How to write subject lines people actually open.
The best ecommerce email subject lines aren't clever — they're specific. Specific to the offer, the customer, and the moment. This free generator gives you five angles fast so you can stop staring at a blank field and start testing.
The four hooks that work for DTC
- Curiosity: withhold the punchline. "We changed one thing about the linen. You'll feel it."
- Specificity: a number, a name, a date. "127 reorders this week — here's what they bought."
- Social proof: borrow trust. "Why stylists keep coming back."
- Urgency (earned): a real deadline, not a fake one. "Restock closes Friday."
Things to never do
- ALL CAPS or three exclamation marks.
- "FREE", "$$$", "Act now" — straight into the spam folder.
- More than one emoji.
- Repeating the subject inside the preheader.
Want it to sound like your brand?
This generator works off niche conventions. The full Milgo product trains on your past emails, your voice, your audience, your winning offers — and predicts open rate before you hit send. Start the $1 trial →