Grammarly vs ChatGPT : comparaison complète ! Lequel choisir ? [2026]

Comparaison détaillée entre Grammarly et ChatGPT : tarifs, fonctionnalités, performances et bien plus. Trouvez l'outil qui vous convient le mieux.

Verdict :Grammarly is a professional tool specialized in English writing — with real-time grammar checking, browser integration, and tone adjustment as its core strengths. It is indispensable for anyone writing emails and business documents in English. ChatGPT, on the other hand, excels at generating content from scratch, rewriting, and multilingual support. For writing in languages other than English, ChatGPT is the only option. Grammarly for English proofreading, ChatGPT for content creation — using both together is the most effective approach.

Présentation de Grammarly & ChatGPT

1

Grammarly

An alimente par l'IA anglais writing assistant. Provides grammar and spell checking along with style improvement, tone adjustment, and plagiarism detection.

En savoir plus sur Grammarly
2

ChatGPT

The world's most widely used assistant IA conversationnel developpe par OpenAI. Propulse par GPT-5.4 Thinking, it handles a large gamme de tasks notamment generation de texte, coding, analyse de donnees, and image/creation de videos.

En savoir plus sur ChatGPT

Comparaison des fonctionnalités et tarifs

Tarification
GrammarlyFree / Premium $12/mo / Business $15/mo
ChatGPTFree / Plus $20/mo / Pro $200/mo
文法・スペルチェック
GrammarlyリアルタイムでÉlevé精度に検出・修正
ChatGPT依頼すればPris en charge(リアルタイムではない)
文章生成能力
Grammarly限定的(主に校正・改善が得意)
ChatGPT非常にÉlevéい(長文もゼロから生成Disponible)
トーン・スタイル調整
Grammarly詳細なトーン検出・調整機能あり
ChatGPTプロンプトで指示すればPris en chargeDisponible
ブラウザ統合
Grammarly拡張機能で全Webサイトで動作
ChatGPTChatGPTウィンドウでの操作が基本
盗用(剽窃)検出
GrammarlyPremium版でPris en charge
ChatGPTNon pris en charge
Langues supportées
GrammarlyEnglish only (limited support for others)
ChatGPTMultilingual (50+ languages including many non-English)
日本語ライティング支援
GrammarlyNon pris en charge(英語のみ)
ChatGPTPrise en charge complète(日本語の文章生成・校正Disponible)
アプリ連携
GrammarlyWord・Google Docs・Slack等と統合
ChatGPTAPIで連携Disponible(直接統合は少ない)
学習効果
Grammarly修正理由の説明で英語力向上
ChatGPT対話を通じて文章力全般が向上

Notre verdict

Notre verdict

Grammarly is a professional tool specialized in English writing — with real-time grammar checking, browser integration, and tone adjustment as its core strengths. It is indispensable for anyone writing emails and business documents in English. ChatGPT, on the other hand, excels at generating content from scratch, rewriting, and multilingual support. For writing in languages other than English, ChatGPT is the only option. Grammarly for English proofreading, ChatGPT for content creation — using both together is the most effective approach.

Recommandations par cas d'usage

1

Writing English business emails and documents daily

Recommandé :Grammarly

Browser extension provides real-time proofreading in Gmail, Slack, and more. Tone adjustment matches your audience.

2

Generating long-form content from scratch

Recommandé :ChatGPT

Blog posts, reports, stories — ChatGPT's ability to generate high-quality text from scratch is unmatched.

3

Writing support in languages other than English

Recommandé :ChatGPT

Grammarly only supports English. For proofreading, rewriting, and polishing text in other languages, ChatGPT is the only choice.

4

Checking academic papers and reports in English

Recommandé :Grammarly

Academic tone settings, plagiarism detection, and clarity scoring cover all the essentials for academic writing.

5

Writing in both English and other languages

Recommandé :ChatGPT

Multilingual support lets you handle writing, translation, and proofreading across languages in one tool. Pairs well with Grammarly for English.

Avis détaillés

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