TooL Void
Live Analysis · Pure JS · No API · Free Forever

Count words.
Analyze deeply.
Write better.

Real-time word count, readability scores, keyword extraction, sentiment analysis, AI detection, and 20 text tools — all in your browser.

Open Analyzer→See All Features
Word Count
Characters
Readability
Flesch Score
Gunning Fog
Sentiment
AI Detection
Keywords
Find & Replace
Case Converter
Export
⚡ Live Analyzer

Start Typing or Paste Text

Every metric updates as you type — zero delay, zero uploads.

16
1
Target:words
0/0 (0%)
Case Converter
Text Cleaner
Text Transform
PASTE COMPARISON TEXT
Uses Jaccard similarity — compares word overlap between texts.
✦ What's Inside

Every Writing Metric

From basic word counts to AI detection — all pure JavaScript, all private.

📊

Real-Time Counting

Words, characters, sentences, paragraphs, lines, unique words, and average word length — all live.

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Readability Scores

Flesch Reading Ease, F-K Grade, Gunning Fog, Coleman-Liau, ARI — five industry-standard scores.

🔑

Keyword Extraction

Top 20 keywords by frequency, with density percentages and visual frequency bars. Stop words excluded.

😊

Sentiment Analysis

Pure JS positive/negative/neutral word detection with score and percentage breakdown.

🤖

AI Content Detection

Heuristic analysis using transition phrase frequency, sentence variance, passive voice ratio, and hedge words.

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20 Text Tools

Case converter, text cleaner, reverse text, ROT13, line sorter, duplicate remover, find & replace.

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Similarity Checker

Jaccard similarity comparison between two texts. Find how closely related two pieces of writing are.

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Export Options

Download as .txt, .md, or .html. Export a full analysis report with all stats in one file.

❓ FAQ

Frequently Asked

Common questions about the analyzer.

Does it save my text anywhere?⌄
No. All analysis happens in your browser using pure JavaScript. Your text never touches any server. Close the tab and it's gone. We strongly recommend not pasting confidential material into any online tool, but for this one, it's genuinely safe — there is no backend.
How accurate is the AI detection?⌄
It's heuristic-based — it looks for patterns common in AI writing (overuse of transition phrases, uniform sentence lengths, passive voice, hedge words). It gives a probability score, not a definitive answer. For accurate AI detection, use dedicated APIs like Winston AI or Originality.ai.
Why are my readability scores different from other tools?⌄
Syllable counting in JavaScript is an approximation — it uses rule-based patterns, not a full dictionary. Results may differ slightly from tools that use linguistic databases. The relative comparison between scores on the same text is accurate.
Is this useful for SEO content?⌄
Yes. Keyword density, readability grade level, sentence length, and word count are all key SEO metrics. Most SEO best practices recommend a Flesch Reading Ease score above 60 and keyword density between 1–3%.
Can I use this for academic writing?⌄
Definitely. The readability scores, word count targets, and AI detection are especially useful for academic contexts. The "Export Stats Report" generates a document you can include as a writing log.
✓Done!