Fix grammar, spelling, punctuation and style errors instantly. Paraphrase, rewrite, change tone — powered by Claude AI. Free, no signup.
KJSynthora's AI Grammar Checker uses Claude AI to analyze your text for grammar, spelling, punctuation, and style errors — then provides specific corrections with explanations. Switch between Grammar Check, Paraphrase, Rewrite, Tone Change, and Summarize modes for different writing needs.
The grammar checker uses Claude AI (Anthropic's language model) to analyze your text. It identifies grammar errors, spelling mistakes, punctuation issues, and style problems. For each error it provides the original incorrect text, the corrected version, and a plain-language explanation of why it is wrong. The AI understands context, so it catches errors that rule-based checkers miss.
Grammar errors: subject-verb agreement, tense consistency, article usage (a/an/the), pronoun case, dangling modifiers. Spelling: misspelled words, commonly confused pairs (their/there/they're, affect/effect, etc.). Punctuation: comma splices, missing apostrophes, run-on sentences, semicolon misuse. Style: passive voice, wordiness, vague language, unclear sentences, repetitive words.
Yes. Switch to the Paraphrase tab and choose a style: Standard, Formal, Casual, Creative, Concise, Detailed, or Academic. The AI rewrites the text while preserving the original meaning. Useful for avoiding plagiarism, simplifying complex text, or adapting writing for different audiences.
Yes, completely free. No signup, no word limit, no premium tier needed. The grammar checker is powered by Claude AI through KJSynthora's free tools platform.
The grammar checker works best with English (both US and UK English). It can also analyze and correct text in other languages including Spanish, French, German, Hindi, and more. English provides the most detailed analysis with specific rule explanations.
This tool is powered by Claude AI which understands meaning and context rather than just matching patterns. It provides detailed explanations for each correction. It also includes paraphrasing, rewriting, tone changing, and summarization in one place. Unlike Grammarly, there is no word limit, no required account, and all modes are completely free.
The readability score estimates how easy the text is to read, based on average sentence length, word complexity, and structure. A score above 80 means the text is easy to read (suitable for general audiences). Scores below 60 indicate complex text (academic or technical writing). The score also shows estimated reading time and sentence count.