Track keyword density, LSI keyword coverage, and SEO score live as you write. Premium users unlock AI keyword detection, SERP insights, and 60 languages.
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ContentX — Full Screen Optimizer
ContentX
target keyword...
64
SEO
⭐ Premium
LTR
EN
↓ Export
✕
B
I
U
847w | KW 1.8% | 5/7 LSI
Score
64
LSI Keywords
content marketing
seo strategy
keyword research
SEO Title • 54 chars
Complete Guide to Content Optimization 2025
Meta Description • 152 chars
Learn how to optimize your content for search engines...
Free: English★ Premium: 60 LanguagesLive SEO ScoreLSI Tracking
0
Current Score
0
Words
0/0
LSI Covered
0%
KW Density
Why ContentX is the Best
Live LSI Keyword Tracking
Add any LSI (Latent Semantic Indexing) keywords you want to monitor. The tool counts occurrences in real time, calculates density %, and shows a colored progress bar — green when well covered, red when missing.
Multi-Factor SEO Score
A live 0–100 score based on 5 weighted factors: keyword usage (30%), LSI coverage (25%), content length (20%), heading structure (15%), and meta fields (10%) — updated with every keystroke.
Detailed Issue Analysis
The right panel shows a live checklist of SEO issues tagged as Error, Warning, or Success. Covers keyword presence, meta lengths, H1/H2 structure, content length, LSI gaps, and URL slug.
AI Keyword Detection ★
Premium users unlock AI-powered semantic analysis that detects which keywords and entities search engines expect for your topic — based on real top-ranking page patterns. Add them all with one click.
SERP Insight Bar ★
A premium bar at the bottom of the editor shows what top-ranking competitors wrote about the current paragraph topic — giving you real-time competitive intelligence while writing.
60 Languages ★
English is available free. Sign up for a free account to unlock the full list of 60 languages — Arabic, French, Spanish, German, Japanese, and more — each with correct RTL/LTR handling.
Plans & Pricing
Free
$0/mo
Everything you need to start optimizing in English.
English language
Live SEO score
LSI keyword tracking
Issue analysis panel
Export TXT/HTML/MD
60 languages
AI keyword detection
SERP insight bar
Premium
$19/mo
Full power: AI insights, 60 languages, SERP intelligence.
Everything in Free
60 languages + RTL/LTR
AI keyword detection
Live SERP insight bar
Entity coverage analysis
Priority support
Enterprise
$79/mo
Team access, API, custom integrations, and dedicated support.
Everything in Premium
5 team seats
API access
Custom domain
Dedicated account manager
How to Use ContentX
01
Open the Optimizer
Click "Open Optimizer" or press Ctrl+E to launch the full-screen writing and optimization interface.
02
Set Target Keyword
Enter your focus keyword in the top bar. Fill in the SEO Title, Meta Description, and URL Slug fields — these directly affect your score.
03
Add LSI Keywords
Switch to the "LSI Keywords" tab in the left panel. Add related terms you want to track — the tool monitors usage, density, and coverage in real time as you write.
04
Optimize & Export
Use the Analysis panel to fix issues. When your score reaches 70+, export as TXT, HTML, or Markdown — or copy directly to your CMS.
ContentX
0
0w|0%|0/0 LSI
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Not Optimized
Enter content to begin
Category Scores
Keyword
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LSI Cover
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Length
0
Headings
0
Meta
0
Readability
Reading Level
—
Avg Sentence
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Add LSI Keywords
Add LSI keywords to track them live
SEO Title (50-60 chars)
0/60
Meta Description (150-160 chars)
0/160
URL Slug
0 chars
Content Issues
Start writing to see analysis
AI Keyword Intelligence
Discover keywords search engines expect for your topic — semantic analysis of top-ranking pages.
AI-detected LSI clusters
Entity coverage score
Semantic gap analysis
Auto-suggest missing terms
Export Content
SEO Report
SERP Insight
Top-ranking pages discuss this topic in depth...
Real-time SERP Insight
⭐ PREMIUM
Score: 0
0 words
KW: 0%
0/0 LSI
Premium locked
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Unlock all features: AI keywords, SERP insights, and 60 languages.