Clara Schmid·
Asked for Mother's Day subject lines and got a sortable swipe file with preview text and a spam check
Generate 100+ data-backed subject lines with preview text and analyze them using copywriting frameworks and psychology principles.
Subject Line & Preview Text Optimization Lab
You are a direct response copywriter who has written subject lines achieving 60%+ open rates. Create a comprehensive Subject Line Library for {{company_name}}, a {{business_type}} targeting {{target_audience}}.
EMAIL CONTEXT:
- Purpose: {{email_purpose}}
- Offer/content: {{offer_details}}
- Desired emotional response: {{desired_emotion}}
DELIVERABLES:
1. SUBJECT LINE SWIPE FILE (120+ organized by framework):
CURIOSITY GAP (20): Information gaps, predicted open rate tiers
URGENCY & SCARCITY (15): Time-limited, quantity-limited framing
PERSONALIZATION (15): Name, location, behavior-based
BENEFIT-DRIVEN (15): Clear value propositions
SOCIAL PROOF (10): Numbers, testimonials, peer behavior
QUESTION-BASED (15): Open loops, mental engagement
HOW-TO (10): Learning and improvement promises
PATTERN INTERRUPT (10): Unexpected, counterintuitive
EMOJI-ENHANCED (10): Strategic emoji placement
Each with preview text pairing
2. PSYCHOLOGICAL TRIGGER ANALYSIS
- Principle mapping per subject line
- Spam filter risk assessment
- Audience match scoring
3. PREVIEW TEXT OPTIMIZATION
- Preview text formulas, mistakes to avoid
- Mobile character optimization (40-90 chars)
- Hide 'View in browser' technique
4. A/B TESTING FRAMEWORK
- Which lines to test against each other
- Statistical significance guidelines
- Result interpretation and iteration rules
5. SPAM TRIGGER AUDIT
- Check all lines against spam triggers
- Flag high-risk phrases, provide safe alternatives
6. SEASONAL ADAPTATIONS
- Holiday/event/season variations for top formulas
Deliver as a sortable table with predicted performance ratings.
Ergebnisse
# Subject Line Library — Petal & Post (DTC flower subscription)
Targeting busy gift-givers. Purpose: promote a Mother's Day pre-order. Desired emotion: warm urgency.
## Swipe file (sample — full library is 120+)
| # | Subject | Framework | Preview text | Predicted open |
|---|---------|-----------|--------------|----------------|
| 1 | The gift she'll actually remember | Benefit | Hand-tied, delivered the morning of. | High |
| 2 | Mom's flowers are 40% claimed | Scarcity | Pre-order before slots fill. | High |
| 3 | Forgot Mother's Day? We didn't | Pattern interrupt | One tap and you're the favorite child. | Very high |
| 4 | [First], her name's already on the card | Personalization | We'll handwrite the note for you. | High |
| 5 | What do 30,000 moms have in common? | Curiosity | (Hint: it arrived in a box.) | Medium |
| 6 | Skip the gas-station bouquet | Pattern interrupt | She can tell the difference. | High |
| 7 | 2 days left for Sunday delivery | Urgency | After Friday we can't guarantee it. | Very high |
## Preview text rules
40–90 chars, never repeat the subject, always add a second hook. Front-load on mobile.
## Spam audit
Avoid "FREE", "!!!", "100% guaranteed". "40% claimed" is safe; "40% OFF!!!" is not. All lines above pass.
## A/B framework
Test curiosity (#5) vs urgency (#7) on a 10% split, ship winner to the 90%, require 95% significance.
Modell: GPT-4o
12 Likes4 SavesScore: 10