Is GPTZero letting you down? Let’s be honest.
This tool can be frustrating. It often flags human 제니 vs 라이트소닉: 2025년 최고의 AI 작가 7 as AI.
This is called a false positive. You might also miss actual AI content.
This double-checking wastes your time. It makes your job much harder.
You need a reliable tool you can trust every single time.
Stop stressing over inaccurate results. We tested the top options for you.
This guide has the 9 best GPTZero Alternatives that offers better accuracy and smarter checks.
Find the perfect AI detector for your needs today.
What Are the Best GPTZero Alternatives?
We know you need a dependable AI チェッカー.
The market has many options, but which ones actually work?
We looked at accuracy, ease of use, and price. We picked only the most reliable tools.
Our list below shows the best alternatives you can use right now.
1. Copyleaks (⭐4.8)
This tool is super accurate.
It helps you find AI text even when it’s mixed with human writing.
Copyleaks checks content in over 30 languages.
It gives you a clear report that shows the parts that look like AI.
主なメリット
Copyleaks has some great, unique features. It helps keep your work safe and honest.
- It claims over 99% accuracy in its internal testing.
- It has an incredibly low 0.2% false positive rate, which means it rarely flags human work by mistake.
- The tool checks for AI content in over 30 languages.
- It offers a unique feature called AI Logic that explains なぜ the content was flagged.
- It includes AI Image Detection and can check for source code plagiarism.
価格
- 個人的： $13.99/month.
- Pro: $74.99/month.
長所
短所
2. Originality AI (⭐4.5)
Originality AI is focused on creators and marketers.
It tells you the exact probability that your text is AI-generated or human-written.
This tool can also check for plagiarism. It has a low false-positive rate among educators.
You can start with a free trial. You then buy credits based on how many scans you 作る.
私たちの見解
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.
長所
短所
3. QuillBot (⭐4.0)
You probably know QuillBot for fixing and rewording text.
But it also has a great AI detector. The tool is very simple to use.
Just paste your text to get a score right away. It is free for basic checks.
This makes it a fast and easy option when you are in a hurry.
私たちの見解
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。
長所
短所
4. Winston AI (⭐3.8)
Winston AI claims super high accuracy. It is built for 学校 and publishers.
This tool gives your text a “Human Score.”
It uses color-coding to show what parts are predictable.
Note that it works best with documents over 600 characters.
It also offers a plagiarism check if you upgrade.
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.
価格
- Free: 月額0ドル。
- 不可欠： 月額10ドル。
- Advanced: $16/month.
- Elite: $26/month.
長所
短所
5. Smodin (⭐3.5)
Smodin is a whole set of writing tools.
The AI detector checks content down to the sentence level.
It also has a special feature. You can use it to rewrite AI text to sound more human.
Smodin is used by millions worldwide.
It aims to help you detect AI and avoid penalties.
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.
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.
長所
短所
6. Quetext (⭐3.2)
Quetext is a popular plagiarism checker.
It uses its own DeepSearch™ technology.
This technology finds all kinds of copying, even if you reword the text a little.
It uses AI to do these detailed checks. Quetext is simple to use.
It gives a clear, side-by-side view of matched sources.
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.
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.
長所
短所
7. Undetectable (⭐3.0)
This tool is mostly an AI Humanizer.
It takes AI-written content and tries to make it sound human.
The goal is to bypass other AI detectors. It is easy to use and processes text fast.
However, you should always check the quality.
Sometimes the rewritten text needs more fixing.
私たちの見解
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.
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。
長所
短所
8. Phrasly AI (⭐2.8)
Phrasly AI also has an AI Humanizer feature.
Its goal is to make AI text look totally human.
It claims a very high detection accuracy rate for its own scanner.
This tool is built to streamline your workflow.
It is a good choice if you write and then want to polish your content in one spot.
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.
価格
- Free: 月額0ドル。
- Unlimited: 月額12.99ドル。
長所
短所
9. Grammarly (⭐2.5)
Grammarly is the tool everyone knows for fixing grammar.
Now it has an AI Detector, too.
It tells you what percentage of your writing seems AI-generated.
This is great because it works right inside Google Docs or Word.
It is perfect for getting an easy second opinion as you write.
私たちの見解
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。
長所
短所
バイヤーズガイド
When doing our research to find the best AI detector, we determined it using these factors:
- Accuracy and Reliability: We tested how well each of the so many ai detectors could identify ai generated text. This included checking if the AI detection tools could truly detect AI-generated content and detect AI content from multiple models. We focused on the most accurate AI detectors that use advanced algorithms and look for AI patterns in machine-written text. Our goal was to find precise AIツール that provide accurate results and the best AI detection tools against all forms of generated text. We also looked closely at the performance of the Sapling AI detector and other advanced AI models.
- Features and Capabilities: Beyond basic AI text detection, we checked the key features and advanced features. Could the AI tools offer a generous free version or free plan? We assessed Quillbot’s AI detector for its unique benefits. We also looked for plagiarism detection and writing feedback, and whether the detection tools included a browser extension or integrated with other tools, like image 発電機, to be a comprehensive tool and our new go-to tool. We wanted helpful features that let users easily check the same text.
- User Experience (UX): A tool must have a user-friendly interface and be easy to use. We checked whether finding the source of AI-generated text could be done in just a few clicks. We evaluated features relevant to educational institutions and professional environments, such as Google Classroom integration and the ability to check Siter vs B12: 2025년 최고의 AI 웹사이트 빌더 대결 15 assignments or verify academic papers. The tool needed to save time for content creation teams.
- Pricing Structure: We analyzed the different pricing plans, including the cost of the essential plan, professional plan, and premium plan. We considered the value offered by the paid plan versus the functionality of the free version.
- Ethical AI Use: Finally, we ensured the tools support the ethical use of AI models. We tested their ability to distinguish between human-written content and AI-generated content to protect human-written text. Our focus was on promoting ethical AI practices by recommending accurate AI detectors. We also looked at features that could improve the writing style of generated text.
まとめ
Finding the right AI detector tools can feel tough. We know that.
We reviewed the top choices so you don’t have to guess.
Tools like Copyleaks offer strong AI content detection.
Others give you more advanced tools for rewriting.
The best choice really depends on what you need it for.
We tested these tools deeply to give you honest advice.
Trust our research. Pick one of these alternatives today.
You will get more accurate results and save a lot of time.
よくある質問
Which GPTZero alternative is the most accurate?
The most accurate alternative is Copyleaks. It uses advanced technology to detect all forms of AI-generated text. It is very good at spotting mixed or edited content.
Do these AI detectors also check for plagiarism?
Yes, many of the top options include plagiarism checking. Originality AI and Quetext are known for their dual features. This saves you time and effort.
Can I use a GPTZero alternative for free?
Absolutely. Tools like Grammarly and QuillBot offer a good free plan for basic detection. For more scans or advanced features, you will need a paid plan.
Are these tools good for teachers and students?
Yes, tools like Winston AI are built for educational institutions. They help 教師 easily check student assignments for AI-generated content.
How do I choose the best AI detector for my needs?
Consider what you mainly write. If you need speed, use QuillBot. If you need deep reports for publishing, choose Originality AI or Copyleaks.
English 
Spanish 
Chinese 
German 
French 
Arabic 
Russian 
Portuguese 
Japanese 
Korean