How to write an email subject line with this tool
- 1
Describe what is actually in the email
Give the main idea, any number or result, and what the reader gets. Subject lines built on the real content are specific; ones built on a vague topic sound like every other email.
- 2
Add the audience if you have one
Optional. “New subscribers” and “customers who bought last year” need different subject lines. Choose from 15 languages.
- 3
Shortlist two and test them
Pick two that take different angles, pair each with preview text, and A/B test them if your email tool supports it. Click More for a fresh batch.
Write for the phone inbox first
A large share of email is read on phones, and mobile inboxes show roughly the first 30-50 characters of a subject line, depending on the app and screen. Anything after that may never be seen. Put the word that matters most at the start, and make sure the line still makes sense if it is cut off halfway.
Short does not mean vague. “Your content plan” is short and forgettable; “Plan a month of posts in one afternoon” is short and tells the reader exactly what they get.
Pair the subject line with preview text
Most inboxes show a line of preview text (also called preheader text) after or under the subject. If you do not set it, many email clients pull in the first words of the email, which is often “View in browser” or your logo’s alt text. That space is free and it is wasted.
Treat the subject and preview text as one message. The subject makes the promise or opens the question; the preview text adds the detail that tips the reader into opening. Subject: “The 3 tools I plan with”. Preview: “Plus the template I use every month, free to copy.” Do not just repeat the subject.
Subject line patterns that work
- Clear benefit: say what the reader gets. “A month of content in one afternoon”.
- Curiosity with a clear topic: “The tool I stopped paying for”. The reader knows the subject area and wants the name.
- A specific number: “3 templates for your next launch”, “What 200 replies taught me about pricing”. Use numbers that are true for this email.
- A question the reader is already asking: “Is posting every day worth it?”
- Plain and personal, like a message from a friend: “quick question” or “I got this wrong”. Works well for creator newsletters with a personal voice, as long as the email follows through.
- Real urgency only: “Doors close Friday” when doors really close Friday. Invented deadlines teach readers to ignore you.
Habits that look like spam, and newsletter tips
- Avoid ALL CAPS, strings of exclamation marks and a row of emoji. They look like spam to readers and can count against you with spam filters.
- Never use a fake “Re:” or “Fwd:” to imply an existing conversation. It gets an open once and costs you trust.
- Do not promise what the email does not contain. A subject line that oversells leads to unsubscribes and spam complaints, which hurt the delivery of future emails.
- For a regular newsletter, keep a recognisable sender name and let the subject line carry the topic of this issue rather than “Newsletter #47”.
- Write the subject line after the email, not before. It is easier to sell something that already exists.
How to A/B test subject lines
Many email platforms let you send two subject lines to a sample of your list and send the winner to everyone else. Test one change at a time, such as curiosity against a clear benefit, so you know what made the difference. Small lists produce noisy results, so look for patterns across several sends rather than trusting one test.
Judge by more than opens. Some email apps load images automatically and can make opens look higher than they are, so clicks and replies are a better sign of which subject line brought in the readers who actually cared.
Made by CreatorsCompanion
CreatorsCompanion is an AI content repurposing app for creators. It turns one idea, link or video into drafts for Instagram Reels and TikTok, LinkedIn, X, YouTube, email newsletters and Instagram carousels, in your own voice and language, each built on one of 15 named content structures.
Start free, no card