Analyze your text's readability, sentiment, and SEO quality. 8 readability formulas, all running in your browser. Nothing leaves your machine.
Try it free →Free tier available. Pro unlock: $9.99 one-time.
Every major readability index in one place, averaged into a single consensus grade.
Go beyond grade level with analysis that helps you improve what you write.
Your writing never touches a server. All analysis runs locally in your browser.
| Feature | Free | Pro — $9.99 |
|---|---|---|
| Flesch-Kincaid grade level | ✓ | ✓ |
| Word count & reading time | ✓ | ✓ |
| Basic statistics | ✓ | ✓ |
| All 8 readability formulas | — | ✓ |
| Sentiment analysis | — | ✓ |
| Keyword extraction | — | ✓ |
| SEO scoring | — | ✓ |
| Text summarization | — | ✓ |
| Markdown export | — | ✓ |
| Analysis history | — | ✓ |
| File upload (.txt, .md) | — | ✓ |
One payment. No subscription. Yours forever.
Type directly, paste from anywhere, or upload a .txt or .md file. No account required.
Readability grade, sentiment score, top keywords, and SEO suggestions appear immediately — all computed in your browser.
Pro: export a full markdown report, save analyses to history, and track how your writing improves over time.
ProseScore is powered by textlens, a zero-dependency TypeScript text analysis library available on npm. If you need readability scoring in your own project or CI pipeline, textlens gives you the same 8 formulas as a lightweight, type-safe package.
import { analyze } from 'textlens';
const result = analyze(text);
console.log(result.readability.consensusGrade); // e.g. 8.4
console.log(result.sentiment.label); // "positive"Free tier available immediately. No sign-up, no email, no credit card.
Open ProseScore →Pro unlock: $9.99 one-time — all 8 formulas, sentiment, SEO scoring, export