Sentence Checker

The Online Sentence Checker analyzes input text to quantify readability, detect grammar and style issues, and provide actionable rewrite suggestions. It is designed for writers, editors, students, educators, and content teams who need fast, objective feedback on sentence-level quality to accelerate drafting, revision, and assessment workflows. Use cases include quick quality checks during initial drafting, rubric-based student feedback, editorial triage, and content audits for web copy or reports. The tool accepts typical prose passages of varying length and returns structured metrics, issue flags, and concrete rewrite tips without requiring manual parsing or external references.

Core Logic & Features: The tool blends lightweight rule-based checks with widely used readability formulas. It computes Flesch Reading Ease, Flesch-Kincaid Grade Level, and SMOG from average sentence length and syllable counts, yielding a readability score and a relative grade level. It also flags grammar and style concerns such as passive voice, wordiness, redundancy, vague nouns, and overlong sentences, and it provides targeted rewrite suggestions. Optional advanced analysis includes detecting jargon density, nominalizations, and sentence variety metrics. Outputs are designed for machine consumption and human review, with clear summaries and drill-downs per issue.

Inputs & Outputs: Input text: string, required, 5–5000 characters. Outputs: readability_score (0–100), grade_level (numeric), average_sentence_length (words), syllable_count, grammar_issues (list), issues_count (integer), and suggestions (list of rewrite tips). Validation ensures length bounds and basic language detection; non-English text receives lower weights and best-effort scores.