Email Subject Line & YouTube Title Analyzer Free — Score and Improve Instantly

Your email subject line determines whether anyone opens it (average open rate: 21%). Your YouTube title determines whether anyone clicks (average CTR: 2-10%). Both are headlines — and both can be scored and improved before you hit send or publish. Free, instant, no signup.

Optimal Length by Platform

Platform	Max Length	Visible Length	Sweet Spot
Email subject (mobile)	No limit	30-40 characters	30-50 characters (6-10 words)
Email subject (desktop)	No limit	60-70 characters	Same — write for mobile first
YouTube title	100 characters	45-50 in search, 70 in suggested	50-60 characters, hook in first 45
YouTube Shorts title	100 characters	40-45 in feed	Under 50 characters
LinkedIn headline	220 characters	60-70 in search	Front-load keywords in first 60
Blog title (SEO)	No limit	50-60 in Google results	50-60 characters

Email Subject Line — What Works

Technique	Example	Open Rate Impact
Personalization	"{Name}, your report is ready"	✓ +26% open rate
Numbers	"5 tools that saved us 20 hours/week"	✓ +15% open rate
Question	"Are you making this SEO mistake?"	✓ +10% open rate
Urgency (real)	"Sale ends at midnight"	✓ +22% when genuine
Curiosity gap	"The email that got us 47 replies"	✓ +18% open rate
ALL CAPS	"FREE OFFER INSIDE!!!"	✗ -20% (spam filter trigger)
Clickbait	Subject doesn't match content	✗ Increases unsubscribe rate

YouTube Title — What Gets Clicked

Technique	Example	Why It Works
Transformation	"$0 to $10K/mo in 90 Days"	Promise of change viewers want
Versus/comparison	"iPhone 16 vs Samsung S25 — Honest Review"	Viewers choosing between options
Number + timeframe	"I Tried Coding for 30 Days"	Specific, measurable, relatable
Unexpected result	"The $5 Mic That Sounds Like $500"	Surprise creates click curiosity
Tutorial + outcome	How to Edit Videos Like a Pro (Free Tools)"	Clear value + accessibility
Challenge format	"I Only Ate $1 Food for a Week"	Entertainment + curiosity

Subject Lines That Kill Open Rates

• "Newsletter #47" — zero reason to open. Replace with the most interesting thing in the newsletter: "The tool that replaced our $500/mo stack"
• "Quick question" — overused by salespeople. Recipients assume it is spam. Be specific: "Question about your Q2 content strategy"
• "Don't miss out!!!" — excessive punctuation triggers spam filters. One exclamation mark maximum, and only when the urgency is real
• "RE: RE: FWD: Meeting notes" — fake reply chains are deceptive. Just write a clear subject: "Meeting notes from March standup"
• Empty subject line — some marketers claim this increases opens out of curiosity. It also increases spam complaints and unsubscribes. Don't gamble.

YouTube Shorts vs Regular Video Titles

Shorts titles need to be even shorter because less is visible in the Shorts feed:

• Regular video: "How I Built a $100K Side Business While Working Full-Time (Step by Step)" — 73 characters, works because 45+ chars are visible in suggested
• Short: "This $5 Tool Changed Everything" — 33 characters, hook is immediately visible in the Shorts feed
• Shorts compete in a swipe-feed where titles are secondary to the first frame. Keep the title punchy, let the video hook do the heavy lifting

Complete Headline Toolkit

• Headline Analyzer — score any headline (email, YouTube, blog, LinkedIn)
• Subject Line Generator — AI generates 10 email subject line options
• Social Caption Generator — AI captions for social platforms
• Readability Scorer — check email body readability
• Email Writer — AI generates full email drafts
• Word Counter — check character counts