Best Grammar & Editing AI Tools in 2026

Grammarly

Freemium

AI-powered writing assistant for grammar, clarity, and tone

• Real-time grammar, spelling, and punctuation correction
• Tone detection and adjustment
• Full-sentence rewrite suggestions
• Plagiarism detection against 16 billion web pages
• Browser extension for Chrome, Firefox, Safari, and Edge

LanguageTool

Freemium

Open-source multilingual grammar checker supporting 30+ languages

• Grammar and style checking for 30+ languages
• Open-source core engine with self-hosting option
• Browser extensions for Chrome, Firefox, Safari, and Edge
• Microsoft Word and Google Docs add-ins
• AI-powered sentence paraphrasing

ProWritingAid

Freemium

Comprehensive writing analysis for style, readability, and structure

• 20+ detailed writing analysis reports
• Style, readability, and sentence structure analysis
• Overused words, cliche, and sticky sentence detection
• Scrivener integration for fiction writers
• AI Sparks for generative rewriting and expansion

Wordtune

Freemium

AI writing companion for rewriting, rephrasing, and tone adjustment

• Sentence-level rewrite suggestions with multiple variations
• Tone adjustment between casual and formal registers
• Length controls for shorter or longer phrasings
• Wordtune Read for document and article summarization
• Inline AI writing suggestions as you type

Hemingway Editor

Freemium

Readability-focused editor that highlights complex and unclear writing

• Color-coded highlighting of complex sentences and passive voice
• Readability grade level scoring
• Adverb and weakening phrase detection
• Direct publishing to WordPress and Medium
• AI-powered sentence rewriting in Editor Plus

HyperWrite

Freemium

AI writing assistant with browser-wide autocomplete and generation

• TypeAhead intelligent sentence autocomplete across all websites
• AutoWrite full content generation from prompts
• Email generation from bullet points
• Text summarization and simplification tools
• AI agent for autonomous web task execution