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Subject Line Variants

/subject-lines  Writes 10 subject lines for an email in five styles, each under 45 characters, with preview text to match.

Add to Sidekick

Add opens your Shopify admin with the skill prefilled; review it there and click Add. If nothing appears, use Copy and follow the steps below.

Personalize before you add

Values come from your store profile when set. Leave a field blank to keep the placeholder and fill it in Sidekick.

The skill

Suggested shortcut: /subject-lines
Write subject lines for an email about [EMAIL TOPIC].

## Steps
1. If the topic involves products, check their names and prices in the store so the lines are accurate.
2. Write 10 subject lines, 2 in each style: plain statement, question, benefit-led, curiosity without clickbait, and specific number or detail. Each under 45 characters, no all-caps, at most one emoji across the whole set.
3. For each, write preview text under 90 characters that adds information rather than repeating the subject.
4. Mark the 2 you would A/B test and say why in one line.

## Output
A table: style, subject line, characters, preview text. Then the two picks.

Do not use "last chance", "don't miss" or fake deadlines unless a real end time exists.
How to add it to Sidekick
  1. Click Add to Sidekick above. Your Shopify admin opens with the skill ready to review. Click Add. Done.
  2. If the button does nothing in your store: click Copy skill, open Sidekick in your admin, type /, choose Create new skill, name the shortcut subject-lines, paste the text as the instructions, and save.
  3. To run it, type /subject-lines in Sidekick. Sidekick keeps up to 25 skills; manage yours from the skills menu.

What you get

Ten usable options in a table with counts, so nothing truncates on mobile, and a recommended pair to test.

When to use it

Every campaign. Subject lines are the cheapest lever in email.

Variations

  • “Match the tone of our last three campaigns” if you have sent from Shopify Email before.

Limits

Sidekick cannot see open rates from external email tools, so its A/B picks are judgment, not data.

Status: Written for Sidekick but not yet run on a live store. Results may need a second prompt. Time saved: about 15 min / email.

Author: MerchantSkill · License: CC0, no attribution needed · Updated: 19 Sept 2026 · Raw markdown

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