Counting words sounds trivial until you need an exact number against a limit. Plenty of things impose one: a meta description that gets truncated past roughly 160 characters, a social post with a hard cap, an abstract with a stated word limit, a form field that silently rejects overlong input, a page you want to keep above a length that reads as substantial.
This counter updates as you type and reports words, characters with and without spaces, sentences, paragraphs, and lines. Having all of them at once matters because different limits are expressed in different units, and converting between them by estimate is exactly how you end up over.
Estimated reading time is included, based on 200 words per minute. That figure is a reasonable average for adult reading of general prose; dense technical writing is slower and skimming is much faster, so treat it as a rough guide rather than a measurement. It is the same basis most publishing platforms use for the reading-time label on an article.
There is also a keyword density breakdown, listing the most frequent words and how often each appears as a share of the total. The honest use for this is spotting repetition you did not intend, a word you have leaned on three times in a paragraph, rather than hitting a keyword target. Writing to a density figure produces text that reads badly and has not helped search ranking for a long time.
Everything runs as you type with no request, so the tool works offline and an unpublished draft never leaves your machine.