A sentence analyzer breaks your writing into individual sentences and scores them on length variety, opening diversity, structural complexity, transition usage, and overall rhythm — then renders a visual map of your writing's pattern.
Dimension Scores
Structure Mix
Visual Sentence Map
Sentence Length Distribution
Improvement Suggestions
How we score sentences
How to Use the Sentence Analyzer
Sentence structure is the hidden architecture of engaging writing. Even when every word choice is correct, monotone sentence structure makes text feel flat and hard to read. The Sentence Analyzer reveals your sentence patterns — variety, rhythm, structure, and transitions — so you can make targeted improvements before publishing.
Step 1: Paste Your Text
Copy any piece of writing and paste it into the analyzer. The tool works best with at least 5 sentences to calculate meaningful variety and rhythm metrics. Longer passages (20+ sentences) provide the most reliable structure analysis. Click "Analyze Sentences" or use the Sample button to see the tool in action.
Step 2: Read the Visual Sentence Map
The visual map renders each sentence as a colored bar. Width represents word count — wider bars are longer sentences. Color represents structure: blue for simple sentences, purple for compound (two joined clauses), and green for complex (subordinate clause). A healthy rhythm shows alternating widths with a mix of colors. Identical-width bars in a row signal monotonous structure.
Step 3: Click Any Sentence for Details
Clicking a bar in the visual map highlights that sentence and shows its individual metrics: word count, structure type, whether it starts with a weak opener, and whether it uses transition words. This helps you find specific sentences to revise rather than guessing from a global score.
Step 4: Act on the Dimension Scores
Six dimension scores reveal different aspects of your sentence structure. If Length Variety scores FAIL, look for runs of same-length sentences — break long ones into two or merge short fragments. If Opening Diversity scores poorly, rewrite sentences that start with "The", "It", "There" to start with verbs or more specific subjects. If Transitions score low, add connective words between key paragraphs to improve logical flow.
Typical Targets by Writing Type
Fiction and creative writing should aim for high length variety (σ > 6) with strong rhythm alternation. Blog posts and essays work best with average sentence lengths of 15-20 words and good transition usage. Technical documentation often uses shorter sentences (12-15 words) for clarity. Academic writing tolerates longer average sentences but should still maintain structure variety.
FAQ
Is this sentence analyzer free to use?
Yes, the Sentence Analyzer is completely free with no usage limits. Everything runs in your browser — your text is never sent to a server. No account required.
Is my text safe and private?
Yes, 100% private. All analysis happens locally in your browser using JavaScript. Your text never leaves your device.
What is sentence length variety and why does it matter?
Sentence length variety measures how much your sentences differ in length, expressed as the standard deviation of word counts per sentence. High variety (std dev > 5) creates engaging rhythm — short sentences create punch, long sentences develop ideas. Monotone same-length sentences make writing feel robotic and dull.
What are transition words and how many should I use?
Transition words (however, therefore, meanwhile, furthermore) connect ideas between sentences and guide the reader through your logic. Good writing uses transitions in 15-25% of sentences. Too few leaves ideas disconnected; too many feels mechanical and formulaic.
How does the visual sentence map work?
The visual map renders each sentence as a colored bar where width proportionally represents word count and color indicates structure type (simple, compound, or complex). Reading the pattern left-to-right reveals your writing rhythm — alternating widths indicate variety, while identical-width bars show monotone structure.
How are sentences classified as simple, compound, or complex?
Simple sentences contain one independent clause. Compound sentences are detected by coordinating conjunctions (and, but, or) or semicolons joining two clauses. Complex sentences are detected by subordinating conjunctions (because, although, while, since, if, when) or relative clauses. The classification is heuristic-based and works well for most standard English text.