Apps similar to LanguageTool include Grammarly, which has a free version. Other options are DeepL Write, Harper, Grammit and Doco. Grammar Checkers like LanguageTool are a crowded field, with more than 100 alternatives for the web, Mac, Windows, Linux and iPhone.
Limato is a Chrome extension for non-native English speakers. Select text in any input field on any web page, press the hotkey, and rewrite it without leaving the page — no copy-pasting into a separate
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Brand writing enforcement for Claude Code — PostToolUse hook catches forbidden terms, passive voice, and sentence length violations before files save.
Aletheia is an AI-powered tool designed to analyze arguments rather than polish prose. It helps users understand how a piece of text is constructed, how its reasoning works, and where its logical weaknesses may lie.
Japan
AI-powered grammar correction tool using fine-tuned language models to fix grammatical errors in text.
Türkiye
A privacy-focused Microsoft Word add-in that highlights mechanical writing patterns, overused phrases, and formatting inconsistencies so users can edit and polish text in their own voice.
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TypeGuard is a Chrome extension that automatically detects and corrects typos and grammar mistakes as you type — inspired by Google's familiar "Did you mean?" experience.
Checks an article against a client's banned terms, word count, required keywords and mixed spellings before you deliver it.
Japan
AI Slop Index (ASI) is VibeAxis’s open method and toolset for scoring synthetic-sounding content. It flags vague quantifiers, passive voice, credulous claims, and other slop signals, then rolls them into a transparent score. MIT-licensed components; zero tracking.
United States
A prose editor that highlights flat, mechanical-sounding writing, like repetitive sentence rhythm and stock phrases, without rewriting your text.
United States
WordWand is a system-wide AI assistant for macOS that works in any app through a single keyboard shortcut. No copy-pasting, no tab switching — just select text, press a hotkey, and transform it instantly.
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Grammar Checker is an advanced proofreading tool that identifies grammar and spelling errors, delivers clear explanations, and offers practical suggestions.
China
Finds misspelled words on any web page. Works 100% offline. No account, no ads, no tracking, no data leaves your browser.
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