Suggest subject line tests

When you need subject line variants for A/B testing so you can improve open rates on a specific send.

By LLM Visibility LabUpdated Mar 9, 2026email
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Dependencies
CursorClaude
SKILL.md
---
name: suggest-subject-line-tests
description: "When you need subject line variants for A/B testing so you can improve open rates on a specific send."
---

Suggest subject line tests

Instructions

Use this skill when the user wants to get subject line variants for A/B testing (newsletter, promo, or lifecycle email). The job: 2–3 testable alternatives and a recommendation on what to test first.

Instructions

  1. Context: Email type, audience segment, main topic or offer, and current subject line if one exists (treat as control).
  2. Variants: Suggest 2–3 alternatives that differ in angle (curiosity, benefit, urgency, personalization) or format (question, number, emoji only if on-brand). Keep under ~50 characters where possible; note mobile preview.
  3. Recommendation: Which variant to test first and what to measure (opens, clicks, or conversion). One sentence each.

Use case

Maximizing the visibility of your emails and discovering which hooks resonate most with your audience.

How to use this skill

Paste your current draft subject line and explain the primary benefit offered in the email.