Content Optimizer

What Is a Content Optimizer?

A content optimizer is a tool that analyses written content and provides data-driven feedback to improve its readability, SEO performance, structure, and keyword usage. Rather than relying on intuition, it applies established formulas — Flesch Reading Ease, Flesch-Kincaid Grade Level, SMOG Index — to give you objective scores with specific, actionable recommendations.

This tool runs entirely in your browser. No API calls, no data uploads, no account needed. Paste your content, optionally add target keywords, and get a full analysis instantly.

How to Use the Content Optimizer

1. 1

   Add target keywords (optional)

   Enter the keywords you want your content to rank for, separated by commas. The tool will track each one's frequency and density separately.

2. 2

   Paste your content

   Paste your full article, blog post, or page content. The more text, the more accurate the analysis — aim for at least 300 words for meaningful results.

3. 3

   Click Analyse Content

   The analysis runs instantly in your browser. Results appear across three tabs: Overview (readability + structure), Keywords, and Recommendations.

4. 4

   Fix high-priority issues first

   Go to the Recommendations tab and address red (high priority) issues first — these have the biggest impact on your score and SEO performance.

5. 5

   Edit and re-analyse

   Edit your content directly in the text box and click "Re-Analyse Content" to see updated scores immediately. Iterate until your score hits 70+.

Frequently Asked Questions

How does this content optimizer work without an AI API?

All analysis runs in your browser using established readability formulas (Flesch Reading Ease, Flesch-Kincaid Grade, SMOG), statistical keyword density analysis, sentence and paragraph structure parsing, passive voice detection, and transition word frequency counts. No external API is used — nothing leaves your device.

What is a good content score?

Scores of 85+ are Excellent — content is well-structured, readable, and keyword-optimised. 70–84 is Good with minor improvements possible. 50–69 Needs Work — usually readability or structure issues. Below 50 is Poor — typically very short content, very difficult readability, or missing target keywords.

What Flesch Reading Ease score should I aim for?

For most web content and blog posts, aim for 60–70 (Standard). Marketing copy targeting a general audience: 70–80 (Fairly Easy). Technical documentation can go lower (40–60). Academic writing often scores 30–50. The tool shows your score with a label and colour to make this easy to assess.

What keyword density is ideal for SEO?

For a primary keyword, 1–2% density is generally considered optimal. Below 0.5% suggests under-use — Google may not associate the page strongly with that term. Above 3% risks keyword stuffing, which Google penalises. Secondary keywords can be lower (0.3–1%).

How many words should my content be?

It depends on intent. Informational blog posts: 1,500–2,500 words for competitive topics. Product pages: 300–600 words. Pillar pages: 3,000+ words. Short-form content (news, listicles): 500–1,000 words. The tool scores content under 300 words as poor for SEO — search engines generally favour comprehensive content.

What is passive voice and why does it matter?

Passive voice uses 'to be' + past participle (e.g. 'it was found'). Active voice is more direct: 'we found'. Passive voice makes content harder to read, scores lower on readability tests, and can feel evasive. Most style guides recommend keeping passive voice under 10% of sentences.

Does this tool check for plagiarism?

No — this tool does not check for plagiarism against external sources. All analysis is based on your input text alone. For plagiarism checking, use a dedicated service like Copyscape or Grammarly.

What are transition words and why do they matter?

Transition words (however, therefore, furthermore, in addition, etc.) signal relationships between ideas and help readers follow your argument. Google's Yoast SEO plugin recommends at least 30% of sentences include a transition word. They also improve Flesch reading scores by making content flow better.