Analyze sentence structures for variety, length distribution, and beginning word patterns in written content.
This tool splits pasted text into individual sentences and reports three views of them: structural type, length in words, and the word each sentence opens with. You get a breakdown of how many sentences are simple, compound, or complex, the average and range of sentence lengths, and a ranked list of opening words with counts. The thing most users get wrong is expecting a verdict. The tool returns distributions, not a score, and you judge the numbers against the audience and genre you are writing for.
A concrete input and expected output from the current implementation.
Input
She writes clearly. The report was long, and it took hours. Because the deadline loomed, she worked late. She writes every morning.
Expected output
4 sentences, 22 words. Sentence lengths: 3, 8, 7, 4 (average 5.5; shortest 3, longest 8). Structure: 2 simple, 1 compound, 1 complex. Opening words: She x2, The x1, Because x1.
Sentence 2 joins two independent clauses with 'and', so it is compound; sentence 3 opens with the subordinate clause 'Because the deadline loomed', so it is complex. The lengths spread from 3 to 8 words, and 'She' starts half the sentences - the repeated-opening pattern this tool surfaces.
The text is divided at sentence-ending punctuation: periods, question marks, and exclamation marks. Sentence length is the number of whitespace-separated tokens, so numbers, abbreviations, and hyphenated terms each count as one word. From those counts the tool derives the average, the shortest and longest sentences, and how evenly the lengths spread across the text.
Each sentence is labeled by clause structure: simple (one independent clause), compound (two or more independent clauses joined by a coordinating conjunction such as 'and' or 'but'), or complex (a subordinate clause such as 'Because the deadline loomed'). Separately, the first word of every sentence is recorded, and the openings are ranked so repeated leads like 'The' or 'She' stand out.
Not by itself. It means the rhythm is uniform, which often reads as monotonous, but the ideal spread depends on genre and audience - technical instructions usually sit in a narrow band on purpose. Use the numbers to notice patterns, then decide whether the pattern serves the text. The tool itself offers no score or recommendation.
More than one paragraph. Ten to twenty sentences, a few hundred words, is enough for the percentages to stabilize; with less, each sentence swings the figures. For a long document, run a whole section in one pass rather than a single paragraph, or the distribution will describe the excerpt, not the writing.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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