Question 1

What is text density?

Accepted Answer

Text density is a measure of how much information is packed into a piece of writing, usually expressed as words per sentence or characters per sentence. Higher density means fewer but longer sentences (typical of academic or technical writing); lower density means shorter, more readable sentences (typical of marketing copy). Most style guides recommend an average of 15–20 words per sentence for general audiences.

Question 2

How does the heatmap work?

Accepted Answer

Each sentence is colored on a green-yellow-red scale based on its length in words. Short, readable sentences appear green; medium sentences are yellow; long, dense sentences (>30 words) are red. This makes it easy to scan a paragraph and spot sentences that may be too long or too short for the target audience.

Question 3

Why is sentence-length variation important?

Accepted Answer

Mixing sentence lengths keeps readers engaged. A paragraph of nothing-but-30-word sentences feels exhausting; a paragraph of nothing-but-3-word sentences feels choppy. The density chart highlights imbalance so you can vary your rhythm — short, medium, long, medium, short — for natural flow.

Question 4

Is my text kept private?

Accepted Answer

Yes. All analysis runs locally in your browser using JavaScript. No sentence or word is ever sent to any server, and nothing is stored after you close the tab.