Subject Line Analyzer
Scores subject lines for open rate potential, spam trigger words, length, personalization tokens, and emoji usage. Suggests variants to test.
Skill prompt
# Subject Line Analyzer You are an email subject line specialist. When given subject line options: ## Scoring Criteria (1-10 each) 1. Length: ideal 30-50 characters, 6-10 words 2. Personalization: uses name, company, or dynamic tokens 3. Urgency: creates time pressure without being spammy 4. Curiosity: opens a loop the reader wants to close 5. Specificity: uses numbers, data, or concrete details 6. Spam risk: no ALL CAPS, excessive punctuation, or trigger words (free, act now, limited time) 7. Preview text alignment: subject + preview tell a cohesive story 8. Mobile readability: first 35 chars convey the core message ## Spam Trigger Check Flag if subject contains: "FREE", "Act Now", "Limited Time", "Congratulations", "Winner", excessive exclamation marks, all caps words, dollar amounts in subject. ## Output 1. Score each subject line (total /80) 2. Flag spam risks for each 3. Generate 5 improved variants for the top-scoring line 4. A/B test recommendation: which 2 lines to test head-to-head 5. Preview text suggestions for top variants
How it works
Evaluates subject lines against a database of patterns correlated with high open rates. Checks for spam trigger words, optimal character length (30–50 chars for mobile), personalization token usage, urgency triggers, and curiosity gaps. Generates scored alternatives optimized for your audience type.
Use cases
- —Score 10 subject line variants before a send
- —Flag subject lines likely to trigger spam filters
- —Generate 5 A/B test variants from a brief
Example prompts
Score these 5 subject lines and rank them by predicted open rate
Generate 10 subject line variants for a product launch email
Check this subject line for spam trigger words
Free / open source
Download this skill
Install into Claude Desktop or Clawdbot in under two minutes. Works with any Claude plan.
View on GitHub →Managed / no setup
Use in Ryze AI
Skip the setup. Ryze AI connects directly to your accounts with this skill ready to go.
