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AI Services for Marketer that Solve "Automated Article Proofreading and Editing"

Catching typos and inconsistent notation is unglamorous but quality-critical work, and the burden on proofreaders only grows as publishing volume increases. Here you can compare AI tools that support proofreading and editing.

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ライトソニック

Writesonic

Writesonic is an "AI Search Growth Engine" (GEO/SEO platform) that measures your visibility across AI search surfaces such as ChatGPT, Gemini, and Google AI Overviews and improves it through content and technical work so your brand gets recommended and cited. Reinvented from its earlier AI writing tool (Chatsonic), it pinpoints which prompts get competitors recommended, fixes the gaps with AI articles and AI agents (Action Center), and demonstrates the impact all the way through to traffic, pipeline, and revenue. It is used by more than 10,000 marketing teams worldwide. Pricing starts at Starter $79, Basic $199, and Growth $399 (per month, billed annually) and more, with a free trial that requires no credit card.

# LLMO・GEO（生成AI検索最適化）# SEO# マーケティング# AIエージェント# コピーライティング

サーファー

Surfer

A content-optimization platform (Positive Surfer) that optimizes content to search intent to be chosen in both Google and AI search. It offers a Content Editor with Content Score, SERP analysis, and the Surfer AI writer, plus an AI Tracker for mentions in ChatGPT, Perplexity, and more. From $49/mo (annual).

# SEO# マーケティング# コピーライティング

ディープエル

DeepL

DeepL (pronounced "deep-L", often typed "deep l") is an AI translation service from Germany's DeepL SE. The free tier covers 50,000 characters a month; paid DeepL Pro starts at ¥1,380/month in Japan (tax incl.). Beyond text and document translation it spans DeepL Write for proofreading, DeepL Voice for speech, and the DeepL API. In Japan, monthly billing is ¥1,380 Individual / ¥4,500 Team / ¥9,000 Business per user (¥1,150 / ¥3,750 / ¥7,500 as the annual monthly equivalent). Paid plans include 30 minutes of DeepL Voice per user per month, and since September 2026 DeepL also works inside Copilot, ChatGPT and Claude via MCP.

# 要約・翻訳# テキスト生成# 業務効率化# 生産性向上# 日本語対応

グラマリー

Grammarly

An AI writing assistant that detects and fixes grammar, spelling, and punctuation errors in English in real time. It also handles tone adjustment, rewriting, generative AI writing, and plagiarism/AI-text detection, usable broadly via browser extensions, desktop/mobile apps, and Microsoft Office and Google Docs. It is English-centric and effectively does not support Japanese proofreading.

# コピーライティング# テキスト生成# 業務効率化# 品質向上・クリエイティブ支援

ミストラル

Mistral

The conversational AI assistant 'Vibe' (formerly Le Chat) from France's Mistral AI. Beyond writing, summarizing, translating, and coding, one environment offers web search, image generation, PDF/document analysis, Deep Research, voice input, memory, and a coding agent. Mistral AI develops open-weight and commercial LLMs. Supports Japanese input/output.

# 生成AI（LLM）# AIチャットボット# テキスト生成# 要約・翻訳# AIエージェント# 日本語対応

ウィスパーフロー

Wispr Flow

Wispr Flow is an AI dictation app that turns what you say into writing you can actually send. It types wherever your cursor is, so it works in Gmail, Slack, Notion, your terminal, ChatGPT — anywhere you can type. It strips out filler words and false starts, adds punctuation and line breaks, and can hold a different tone for each app. It handles 100+ languages including Japanese, and you can teach it proper nouns and jargon through its dictionary. Available on Mac, Windows, iPhone, and Android. There is a free plan, and Pro is ¥960 per user per month as listed for Japan (pricing is shown in local currency). Built by Wispr in San Francisco, which has raised $56M to date.

# 音声認識・音声合成# 音声合成・文字起こし# 議事録作成# 生産性向上# 日本語対応

ワードチューン

Wordtune

An AI writing assistant strong at rephrasing (paraphrasing) English text. It offers tone-adjusted rewrites, summarization, AI text generation, grammar checking, and 'Humanize' to make AI text sound natural, usable via a browser extension or editor. By AI21 Labs. It is English-centric and effectively does not support Japanese proofreading/rewriting.

# コピーライティング# テキスト生成# 要約・翻訳# 品質向上・クリエイティブ支援

ショドー

Shodo

Shodo, from ZenProducts Inc., is a cloud service that centers on Japanese-focused AI proofreading and brings writing, peer review, and task management together ("your AI editorial department"). It flags typos, mis-conversions, honorific errors, and inconsistent notation in real time, and offers Shodo Copilot sentence-ending completion, AI review, a browser extension, Docs/Word integration, and an API. Pricing: Basic free / Premium ¥1,000 / Max ¥5,000 / Business ¥2,000 per user (tax incl.).

# テキスト生成# 要約・翻訳# 日本語対応

シャールック

SHERLOOK

SHERLOOK is a "proofreading tool for video" from HARAKAMI Inc. that supports the final check of finished videos. Upload a video and its AI checks on-screen caption typos, differences from the script, visual glitches such as black frames and gaps, audio levels, social media safe zones, and each client's banned and required wording, then organizes the results into a list with timecodes, the relevant frames and suggested corrections. Results can be shared via a link that needs no login, or as PDF/CSV. An MVP version for businesses is available from ¥30,000 per month (excl. tax, per account).

# AI-OCR（文字認識）# 字幕生成# 音声認識・音声合成# 品質向上・クリエイティブ支援# 業務効率化# 日本語対応

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Reducing Oversights Through Process, Not Willpower

Once you set up a style guide and a list of proper nouns, AI can mechanically flag not just typos but also inconsistent style and redundant phrasing. Because manual proofing alone is prone to fatigue-driven oversights, a practical division of labor is to let AI handle the first pass while people focus on verifying facts and contextual accuracy.

Checklist When Choosing a Tool

Whether you can register your own style rules and banned words as a custom dictionary
Whether it goes beyond typos to suggest improvements in phrasing and tone
Integration with your CMS or writing tools (plugin support, etc.)
Whether the reasoning behind each suggested edit is shown, so a person can judge it easily