# Newsletter Subject Lines

> Write newsletter subject lines for OpenEd Daily using 15 proven formulas + 10 Commandments evaluation. Generate 10+ options, select best through systematic criteria.

- Skill: `majiayu000/newsletter-subject-lines` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/newsletter-subject-lines`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/newsletter-subject-lines/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/newsletter-subject-lines

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# Newsletter Subject Lines

Write subject lines that get opens.

**Core Philosophy:** 80% of email performance comes from the subject line. Generate 10+ options, evaluate systematically, select best.

**Key constraint:** 35-50 characters ideal (mobile preview). Be clear even when truncated.

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## The 3-Phase Workflow

### Phase 1: Identify Core Value

**What's the one thing that makes this newsletter worth opening?**

Ask:
- What's the most surprising insight?
- What problem does this solve?
- What will readers learn they didn't know?
- What would make someone forward this?

### Phase 2: Generate 10+ Options

Use multiple patterns below + formulas from `references/10-commandments-checklist.md`:
- Try 3-4 different patterns
- Apply sticky techniques from `references/sticky-sentence-techniques.md`
- Test with/without numbers

### Phase 3: Evaluate & Select

Apply evaluation from `references/newsletter-subject-lines-analyzed.md`:
- Score top 5-7 options with 10 Commandments (aim for 4-6)
- Use 4 U's test (Useful, Urgent, Unique, Ultra-specific)
- Final check: Would YOU open this? Would Sarah forward it?

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## Core Patterns (With Examples)

### 1. Number + Why
Legitimizes with scale, creates curiosity about reasoning.

- "Why 1.5 million students are in microschools now"
- "83% of parents agree: schools aren't preparing kids for AI"
- "The $1,200 your ESA can actually cover"

### 2. Contrast / This vs That
Challenges assumptions with clear binary.

- "The gap that matters isn't algebra. It's initiative."
- "Small schools. Big difference."
- "Credentials vs Community: What actually helps kids thrive"

### 3. Contrarian Truth
Says what's obviously true but rarely said.

- "You don't need permission to start a school"
- "The other kind of testing (the one that actually works)"
- "What if school just... ended earlier?"

### 4. Curiosity Gap
Promises to reveal something specific.

- "What public schools don't want you to know"
- "The education trend public schools fear"
- "The real reason homeschool kids outperform"

### 5. Named Person + Insight
Borrowed authority from someone interesting.

- "Ken Danford quit teaching to prove schools are optional"
- "What Jason Skycak learned tutoring 10,000 hours"
- "She homeschools 5 kids and runs a business. Here's how."

### 6. Challenge + Data
Pattern interrupt backed by evidence.

- "Half of Prenda's guides have no credentials. Here's why it works."
- "Students who test themselves retain 80% more. Schools still don't do it."
- "4-day school weeks work. 900 districts prove it."

---

## Sticky Techniques (Use Sparingly)

Make phrases memorable and quotable.

**Contrast:** "Small schools. Big difference." | "To be everywhere is to be nowhere"

**Symmetry:** "Read for awareness. Write for understanding."

**Alliteration:** "Specificity is the secret" | "Practice produces permanence"

**Rhythm:** Two short parallel phrases that feel balanced

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## OpenEd Swipe File

Real subject lines that performed well:

| Subject Line | Pattern |
|--------------|---------|
| "Why 1.5 million students are in microschools now" | Number + Why |
| "The gap that matters isn't algebra. It's initiative." | Contrast |
| "Small schools. Big difference." | Sticky (Contrast + Rhythm) |
| "You don't need permission to start a school" | Contrarian Truth |
| "What testing actually works (it's not SATs)" | Curiosity Gap |
| "The getting by trap" | Label (names phenomenon) |
| "83% of parents agree" | Number + Validation |
| "Credentials vs Community" | This vs That |

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## Workflow

1. **Identify the core insight** - What's the one thing that makes this newsletter worth opening?
2. **Match to pattern** - Which pattern above fits this insight?
3. **Generate 10+ options** - Try 3-4 different patterns
4. **Select best** - Would YOU open this? Would Sarah forward it?

---

## Preview Text Formula

Complement subject line, don't repeat it.

`[Specific claim]. [Context]. [Gap/tension]. PLUS: [bonus]`

**Example:**
- Subject: "Why 1.5 million students are in microschools now"
- Preview: "It started with frustrated parents. Then the pandemic hit. Now it's a movement. PLUS: how to find one near you."

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## Anti-Patterns

**Don't:**
- Start with "This week in..." or "Our latest..."
- Use clickbait you can't deliver on
- Write vague promises ("Something exciting")
- Use ALL CAPS for emphasis
- Add emojis
- Stop at 2-3 options (generate 10+)
- Use hedge words ("might," "could," "possibly")
- Write generic promises ("many people" vs "1.5 million students")

---

## 10 Commandments Quick Reference

Score your top 5-7 options. Aim for 4-6 per subject line:

1. **Numbers** - Specific stats, not "many" or "several"
2. **Negativity Bias** - Potential loss, mistake, consequence
3. **Pattern Interrupt** - Challenge common belief
4. **Target Callout** - Name specific audience
5. **Problem Callout** - Identify pain point immediately
6. **Confidence** - Strong language, no hedge words
7. **Aesthetics** - Clean, scannable, under 50 chars
8. **Benefit** - Clear outcome promised
9. **Social Proof** - Authority, results, validation
10. **Warning** - Urgency or importance

**Full framework:** `references/10-commandments-checklist.md`

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## Quality Checklist

Before finalizing:

- [ ] **Under 50 characters?** (mobile preview test)
- [ ] **4 U's pass?** (3/4 minimum: Useful, Urgent, Unique, Ultra-specific)
- [ ] **Would you remember it 5 minutes later?** (memory test)
- [ ] **Would you forward it?** (quotability test)
- [ ] **Is meaning clear even truncated?** (clarity test)

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## Bundled Resources

| Resource | Contents |
|----------|----------|
| `references/newsletter-subject-lines-analyzed.md` | Real OpenEd examples with full scoring |
| `references/10-commandments-checklist.md` | Evaluation framework with examples |
| `references/sticky-sentence-techniques.md` | Literary devices for memorable lines |

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## Related

- `opened-daily-newsletter-writer` - Full newsletter workflow
- `article-titles` - Blog/article titles (longer, SEO-focused)
- `segment-titles` - Segment headline writing

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*Generate 10+ options using multiple patterns. Score with 10 Commandments. Select best.*