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LanguageTool 言語ツール

LanguageToolのAI駆動の文法チェッカーで、文法、句読点、スペルのエラーを瞬時にチェックできます。30以上の言語で、簡単にあなたのライティングを向上させましょう。

shipped 2025年12月15日grammar checkerfreemium
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LanguageTool を訪問↗
grammar checkerwritingproofreading
LanguageTool - AI tool hero image
1文法チェッカー
2Please provide the text you would like translated into Japanese.
3Sure! Please provide the text you would like me to translate into Japanese.
𝕏in↑↗

Stork Quadrant

Dead Man Walking· 0/100

An LLM can do most of what this tool's UI promises. No moat, no agent presence.

“LanguageTool is a UI wrapper around grammar-checking logic that Claude, GPT-4, and other LLMs already do better in-context. An LLM can catch grammar, suggest rewrites, and handle multilingual text without leaving the chat. The freemium model buys time but doesn't create defensibility — once agents can call LLMs directly in writing workflows, the tool becomes redundant. This dies unless it owns a vertical where liability matters or becomes an API layer.”

— Claude Haiku 4.5, scored 2026-05-26

Defensibility · 0/100

  • Physical-world coupling
  • Regulatory moat
  • Network liquidity
  • Proprietary refreshing data
  • High-trust catastrophic workflows
  • Multi-party coordination
  • Brand / community / taste

An LLM alone could replace

  • Detect and flag grammar errors in real-time
  • Suggest spelling corrections
  • Identify punctuation mistakes
  • Provide writing style improvements across 30+ languages

Agent-Readiness · 0/100

  • Verified MCP
  • Listed on agent surfaces
  • Usage-based pricing
  • Headless agent auth
  • Public OpenAPI
  • Active changelog
  • llms.txt

How to defend

Pivot to vertical-specific grammar enforcement (legal contracts, medical writing, financial disclosures) where mistakes carry liability and users will pay for auditable corrections. Or become the grammar API that agents and editors call, not the UI.

  • Ship an MCP server and list it on Stork — biggest single point gain (+25).
  • Get listed in the Anthropic MCP registry, Cursor, or Claude Desktop (+20).
  • Add a usage-based or per-call tier; per-seat-only pricing dies when agents replace seats (+15).
  • Expose API-key auth with a self-serve sandbox tier; remove sales-call gates (+15).
  • Publish an OpenAPI spec at /openapi.json or /.well-known/openapi (+10).
How this score is computed →See the full quadrantHow to defend

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overview

概要

瞬時に文法、句読点、スペルのエラーをチェックできる、LanguageToolのAI搭載の文法チェッカー。30以上の言語で、簡単にあなたの文章を向上させましょう。

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