9 Best AI Detectors: Spot AI Contents Instantly in 2025?

執筆者 | 最終更新日 Aug 19, 2025

総合最優秀賞
GPTゼロ
4.8
  • Writing Report
  • Fast API
  • Canvas Integrations
  • Microsoft Add-On
  • 盗作チェッカー
  • 無料プランあり
  • Paid Plans from $8.33
最高の価値
Originality.ai
4.5
  • AI Detection
  • 盗作チェッカー
  • Chrome拡張機能
  • Accurate AI
  • Website Scanner
  • 無料トライアルあり
  • Paid Plans from $12.95
最も注目された
QuillBot
4.0
  • The Paraphraser
  • 文法チェッカー
  • Summarizer
  • Co-Writer
  • Quillbot Keyboard
  • 無料プランあり
  • Paid Plans from $4.17
最高のAI検出器

Worried about AI content?

It’s everywhere now, right?

Hard to tell real from fake.

Teachers, publishers face issues.

Authenticity is a big deal & you need good tools.

We have the answer. Find the best 人工知能 detectors in this article.

Spot AI content fast. Protect your work.

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What is the Best AI Detector?

With so many AI detectors out there, it’s tough to know which one is the real deal.

We’ve done the digging for you and found the top tools that actually work.

Get ready to spot AI-generated content like a pro!

1. GPTZero (⭐4.8)

GPTZero is a favorite.

It helps teachers by checking Siter vs B12: 2025년 최고의 AI 웹사이트 빌더 대결 15 essays.

This tool is very popular.

It looks for AI writing. It’s easy to use.

Unlock its potential with our GPTZero tutorial.

GPTZero Introduction

私たちの見解

GPTゼロ

Ready to see if GPTZero really works? We tested it on 100 samples. See the results for yourself. Click now!

主なメリット

  • 正確さ: Offers 99% accuracy for AI detection.
  • 誤検知: Claims a very low false positive rate (less than 1%).
  • 保証: Comes with a 30-day money-back guarantee.
  • Features: Focuses on perplexity and burstiness, user-friendly interface, supports multiple file uploads, offers batch processing for many documents, integrates with learning platforms.

価格

すべての計画は 毎年請求されます。

  • Free: 月額0ドル。
  • 不可欠: 月額8.33ドル。
  • プレミアム: 月額12.99ドル。
  • Professional: $24.99/month.
GPTZero Pricing

長所

  • Highly accurate.
  • User-friendly interface.
  • Comprehensive features.
  • Constant updates.
  • Supports educators.

短所

  • Paid plans are needed.
  • Limited language support
  • Potential false negatives.
  • Relies on technology.

2. Originality AI (⭐4.5)

Originality AI is super accurate.

Many professionals use it.

It finds even hidden AI.

It helps keep content real.

Unlock its potential with our Originality AI tutorial. 

Originality AI Introduction

私たちの見解

Originality AI

Ready to ensure your content is 100% human-generated? Originality AI boasts a 94% accuracy rate in detecting AI-written text. Don’t risk your reputation – Go for Originality AI today!

主なメリット

  • 正確さ: Boasts 98-100% accuracy.
  • 誤検知: Has a very low false positive rate, around 2%.
  • 保証: Provides a 7-day satisfaction guarantee.
  • Features: Detects AI-generated and AI-edited content, includes a powerful plagiarism checker, scans entire websites, supports detection in multiple languages, offers an API for custom integrations.

価格

  • Pro: 月額12.95ドル。
  • 従量課金制: $30 (One time on demand pricing).
  • 企業: $136.58/month.
Originality AI Pricing

長所

  • High accuracy rate.
  • 使いやすいインターフェース。
  • 手頃な価格。
  • Helpful Chrome extension.
  • Website scanning feature.

短所

  • Occasional false positives.
  • Limited language support.
  • No API access.
  • Can be slow at times.

3. QuillBot (⭐4.0)

QuillBot is more than just a detector.

It helps you rephrase 제니 vs 라이트소닉: 2025년 최고의 AI 작가 7.

Its detector is strong.

It finds AI-made content.

It also helps humanize text.

私たちの可能性を解き放ちましょう QuillBotチュートリアル

Quillbotの紹介

私たちの見解

クイルボット

文章を劇的に変える準備はできていますか?5,000万人以上のユーザーがQuillbotの強力なパラフレーズ機能をすでに体験しています。今すぐお試しください!

主なメリット

  • 正確さ: 一般的な AI 検出で約 90% の精度を実現します。
  • 誤検知: 誤検出率が妥当であることで知られており、通常は 5% 未満です。
  • 保証: プレミアムプランには 3 日間の返金保証が付いています。
  • Features: AI 生成テキストと AI 支援人間テキストを区別し、言い換えおよび文法ツールを統合し、短いテキストの無料スキャンを提供し、詳細な分析レポートと使いやすいインターフェースを提供します。

価格

すべての計画は 毎年請求されます。

  • Free: 月額0ドル。
  • プレミアム: 月額4.17ドル。
  • チームプラン: ニーズに応じて価格をカスタマイズします。
クイルボット

長所

  • 使いやすい。
  • 多彩な機能。
  • 時間の節約。
  • 文章力が向上します。
  • 分析レポート。

短所

  • ぎこちない言い回しをすることがあります。
  • 無料版の制限事項。
  • それだけに頼るべきではありません。
  • プレミアムサブスクリプションの費用。

4. Winston AI (⭐3.8)

Winston AI is very precise.

It checks many content types.

It even spots AI in images.

It’s a powerful tool.

Unlock its potential with our Winston AI tutorial.

Winston AI Introduction

私たちの見解

Winston AI

Over 10,000 writers trust Winston AI. Explore it today and see why it’s the go-to tool for streamlining content creation!

主なメリット

  • 正確さ: Claims an impressive 99.98% accuracy.
  • 誤検知: Reports a near-zero false positive rate.
  • 保証: Includes a 14-day refund policy.
  • Features: Detects AI content from various models like GPT-4o and Gemini, includes an optical character recognition (OCR) feature, offers AI image detection, provides batch processing for bulk checks, has a clean, intuitive design.
YouTubeビデオ

価格

  • Free: 月額0ドル。
  • 不可欠: 月額10ドル。
  • Advanced: $16/month.
  • Elite: $26/month.
Winston AI Pricing

長所

  • Accurate AI Detection.
  • User-Friendly.
  • Comprehensive Analysis.
  • Versatile options.
  • Integrates with AI Tools.

短所

  • Pricing for Advanced Features.
  • AI Detection Challenges.
  • Limited Language Support.
  • Occasional False Positives.

5. Smodin (⭐3.5)

Smodin is a versatile tool.

It checks for plagiarism too.

It helps academic writers.

It also aids content creators.

Unlock its potential with our Smodin tutorial. 

Smodin Introduction

私たちの見解

Smodin

Ready to supercharge your content creation? Over 100,000 users have already tried Smodin. Join them and see how Smodin can help you write faster and wiser!

主なメリット

  • 正確さ: Provides around 95% accuracy for AI content.
  • 誤検知: Has a low false positive rate, typically 3-4%.
  • 保証: No specific warranty mentioned; relies on subscription terms.
  • Features: Combines AI detection with plagiarism checking, supports multiple languages, offers a content rewriter tool, includes a citation generator, good for academic and research papers.
YouTubeビデオ

価格

すべての計画は 毎年請求されます。

  • Writing: 月額9ドル。
  • Reviewing: 月額15ドル。
  • Ultimate: $18/month.
Smodin Pricing

長所

  • Fast content creation.
  • 使いやすいインターフェース。
  • Comprehensive Analysis.
  • 手頃な価格の料金プラン。
  • Helpful AI tools.

短所

  • Pricing for Advanced Features.
  • AI writing quality.
  • 限定無料プラン。
  • Accuracy of AI.

6. Quetext (⭐3.3)

Quetext focuses on originality.

It’s known for plagiarism checks.

Its AI detection is strong.

It uses deep search technology.

Unlock its potential with our Quetext tutorial. 

Quetext Introduction

私たちの見解

Quetext CTA

Over 95% of users in our study found Quetext’s plagiarism detection more accurate than other tools. Ready to create content with confidence? Explore its advanced AI features!

主なメリット

  • 正確さ: Delivers approximately 92% accuracy in AI detection.
  • 誤検知: Maintains a low false positive rate, around 4%.
  • 保証: No explicit warranty; focuses on subscription service.
  • Features: Uses “DeepSearch” technology for thorough analysis, highlights both AI and plagiarized content, offers a clear, color-coded report, provides a citation assistant, good for academic and journalistic integrity.
YouTubeビデオ

価格

すべての計画は 毎年請求されます。

  • Free: 月額0ドル。
  • Enterprise: $11.99/month.
  • 不可欠: $13.99/month.
Quetext Pricing

長所

  • Highly accurate detection.
  • Simple, easy interface.
  • Advanced AI checks.
  • Fast citation tool.
  • Detailed & clear reports.

短所

  • Limited free features.
  • Premium Plans are costly. 
  • Slow, large files.
  • Rare false alarms.

7. Undetectable (⭐3.2)

Undetectable helps you humanize AI text.

It also detects AI content.

It’s useful for これ.

It helps bypass filters.

Unlock its potential with our Undetectable tutorial.

Undetectable AI Introduction

私たちの見解

Undetectable AI

Give Undetectable AI a try! It bypasses 98% of AI content detectors, ensuring your AI-generated text goes undetected. Explore it today!

主なメリット

  • 正確さ: Offers up to 90% accuracy in detecting AI.
  • 誤検知: Claims a low false positive rate, about 5%.
  • 保証: No specific warranty; subscription-based.
  • Features: Focuses on humanizing AI-generated content, checks against various AI detectors, aims to bypass common AI filters, useful for SEO and content marketing, simple and straightforward interface.
YouTubeビデオ

価格

  • Yearly: 月額5ドル。
  • 毎月: $19.00/month.
  • For 仕事: ニーズに応じて価格をカスタマイズします。
Undetectable AI Pricing

長所

  • Bypasses AI detectors.
  • コンテンツの品質が向上します。
  • 時間を節約します。
  • 使いやすいです。
  • Works with various AI writing tools.

短所

  • Not foolproof.
  • Raises ethical concerns.
  • Can be costly.
  • Risk of over-reliance on AI.

8. Phrasly AI (⭐3.0)

Phrasly AI is a newer tool.

It focuses on humanizing AI.

It also offers good detection.

It helps make content sound natural.

Unlock its potential with our Phrasly AI tutorial. 

Phrasly AI Introduction

私たちの見解

Phrasly AI

Want to know if Phrasly AI can truly beat AI detectors? Discover if its 99.99% human content claim is real, explore it today!

主なメリット

  • 正確さ: Provides around 88-90% accuracy for AI detection.
  • 誤検知: Reports a moderate false positive rate, around 6%.
  • 保証: Not explicitly stated; service is subscription-based.
  • Features: Specializes in making AI content undetectable, offers an AI rewriter, provides readability scores, quick and easy to use, aims to help content rank better.
YouTubeビデオ

価格

  • Free: 月額0ドル。
  • Unlimited: 月額12.99ドル。
Phrasly AI Pricing

長所

  • Accurate AI Detection.
  • Effective AI Detection Bypass.
  • ユーザーフレンドリーなインターフェース
  • Comprehensive Analysis.
  • Versatile options.

短所

  • Costly for Advanced Features.
  • Detection Challenges.
  • Limited Support.
  • Occasional errors.

9. 文法 (⭐2.8)

文法 is a writing assistant.

Its AI detection is robust.

It finds AI alongside grammar issues.

It’s a very popular tool.

私たちの可能性を解き放ちましょう Grammarlyチュートリアル

Grammarlyの紹介

私たちの見解

文法CTA

プロレベルの文章をお望みですか?Grammarly Premiumの剽窃チェッカーは160億以上のウェブページをスキャンし、オリジナリティを保証します。今すぐお試しください!

主なメリット

  • 正確さ: 強力な AI 検出を提供し、多くの場合 90 ~ 92% 程度です。
  • 誤検知: 低い誤検出率(通常は 5% 未満)を維持します。
  • 保証: 標準のサブスクリプション条件が適用されますが、特定の保証はありません。
  • Features: AI 検出を文法およびスペル チェックと統合し、盗作検出機能を提供し、リアルタイムのフィードバックを提供し、ブラウザー拡張機能として利用可能で、全体的な文章品質の向上に役立ちます。

価格

すべての計画は 毎年請求されます。

  • Free: 月額0ドル。
  • Pro: 月額12ドル
  • 企業: ニーズに応じて価格をカスタマイズします。
Grammarlyの価格

長所

  • 多くのエラーをキャッチします。
  • 使いやすいです。
  • どこでも動作します。
  • 文章力が向上します。
  • 自信を築きます。

短所

  • 高価になる場合があります。
  • いつも完璧というわけではありません。
  • 過剰修正することがあります。
  • 限定無料版です。

What to Look For When Choosing the Best AI Detector?

  • 正確さ: The most important factor is how well the detector can distinguish between human-written and AI-generated content.
  • Ease of Use: Look for a tool with a user-friendly interface and clear results.
  • スピード: You don’t want to wait forever for results, so choose a detector that works quickly.
  • Features: Consider additional features like plagiarism detection or integration with other tools.
  • 価格: Compare pricing plans and choose one that fits your budget.
  • カスタマーサポート: In case you run into issues, make sure the company offers reliable customer support.

How Can AI Dectectors Benefit You?

  • Protect yourself from misinformation. AI-generated content can be misleading or even harmful. AI detector tools help you separate fact from fiction, ensuring you’re getting accurate information.
  • Maintain academic integrity. In educational settings, it’s crucial to ensure work is original. AI detection tools can help educators and students identify AI-generated content and uphold academic standards.
  • Ensure content authenticity. For businesses and publishers, maintaining trust is key. AI detector tools help verify that content is human-generated, building credibility with your audience.
  • Stay ahead of the curve. As AI technology evolves, so do the methods to detect it. Using an AI detector tool keeps you one step ahead, allowing you to adapt and make informed decisions about the content you consume and create.
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バイヤーズガイド

To determine the best essay AI checker, our research process involved a comprehensive evaluation based on several key factors:

  • 価格分析: We thoroughly investigated the cost associated with each AI tool, including any free tools or free accounts offered, to assess their value proposition.
  • 機能比較: We meticulously identified and compared the unique features of each content detector, looking for functionalities that effectively detect AI content and differentiate between AI-generated text and human-generated content. This included evaluating their ability to identify content written by AI and AI-written content.
  • Identifying Negatives/Limitations: We pinpointed any missing functionalities or weaknesses of each product, such as the potential for false positives when identifying human articles or other limitations in detecting AI-generated text.
  • サポートとrefund ポリシーのレビュー: We examined the availability of customer support, community forums, and refund policies to understand the level of user assistance and satisfaction guarantees offered by the providers of these AI content detectors.
  • Keyword Integration: We ensured that our research and analysis incorporated exact keywords such as human generated text, detect AI content, AI content detector, free AI content detector, free online tools, and identifying AI generated content to align with user search intent and provide a comprehensive guide on AI detection.

This structured approach allowed us to objectively evaluate each AI detector and provide a well-rounded assessment of its strengths and weaknesses in distinguishing between human and AI-written content.

まとめ

We’ve explored the wild world of AI detectors, and it’s clear that these tools are essential in today’s digital landscape.

Whether you’re trying to spot AI-generated content, protect your original human-written content, or ensure the information you’re consuming is accurate.

An AI detection tool is your new best friend.

Remember, the best tool for you depends on your specific needs and budget.

Consider factors like accuracy, features, and ease of use when making your decision.

With the right AI detection model in your corner, you can confidently navigate the online world.

Knowing you have the power to distinguish between human-written text and AI-generated content.

While some tools focus solely on text, others are expanding their capabilities to detect AI-generated images as well.

And as AI technology continues to evolve, so will the tools to detect it.

よくある質問

Can AI detectors be fooled?

Yes, while AI detectors are becoming increasingly sophisticated, there are ways to bypass AI detectors. Some techniques involve carefully crafting content or using specialized AI tools designed to evade detection.

How accurate are AI detectors?

The accuracy of AI detectors varies depending on the specific tool and the AI model used to generate the content. However, many top detectors boast accuracy rates of over 90% in detecting AI content.

Are AI detectors free to use?

Some AI detectors offer free versions with limited features or usage, while others require a paid subscription. Consider your needs and budget when choosing an AIツール.

Can AI detectors identify AI-generated images?

While most AI detectors focus on text-based content, some are starting to incorporate image analysis capabilities to detect AI-generated images.

Why is it important to detect AI-generated content?

Detecting AI-generated content is crucial for maintaining authenticity, combating misinformation, and ensuring academic integrity. It empowers individuals and organizations to make informed decisions about the content they consume and create.

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