Agata

QuillBot is an AI writing suite best known for its paraphrasing tool. Users paste or type text and have it rewritten in different tones and styles, while companion tools handle grammar checking, summarizing, citations, plagiarism checks and AI content detection. It is widely used by students, writers and professionals.

エンタープライズ品質のニューラル機械翻訳、AI ライティング推敲、30 以上の世界言語に対応したリアルタイム音声翻訳。

可読性と文法のフィードバックで、力強く明快な文章を

Wordtune is an AI writing assistant from AI21 Labs that rewrites and tightens your sentences in one click, checks grammar, sums up documents and translates other languages into natural English.

ProWritingAid is a writing platform that combines line-level grammar and style checking with planning, manuscript analysis and story critique tools aimed at novelists, students and professional writers.

あらゆるテキストをチェック・修正・改善するAIライティングアシスタント

書き直さずに文章を磨く高度なAI編集アシスタント

Rewrait is a native Mac and Windows writing app that turns drafts from non-native English speakers into natural, native-sounding English directly inside Slack, Gmail, Teams and any text field.

多言語の文法・スペル・可読性チェックAPI

Trinka is a privacy-first AI writing assistant built for academic and technical writing. Beyond grammar, it handles paraphrasing, consistency checks, file proofreading for Word and LaTeX, citation formatting and quality checks, plagiarism and AI detection, journal finding, and translation across 30+ languages.

書く場所すべてで、インパクトのある文章を

無料のオンライン文法・スペル・句読点チェッカー