Is your current plagiarism チェッカー too costly?
Does it miss the newest types of AI-generated content?
That is a real problem today for students, 教師, and writers.
You need a reliable tool to keep your work honest.
The good news is that there are many out there.
We will show you the 9 best コピーリーク Alternatives for 2025.
This list includes both free and paid checkers.
You will find the perfect plagiarism checker that meets all your needs.
What is the Best Copyleaks Alternative?
You need a new tool that is both strong at detecting plagiarism and at spotting AI-generated writing.
Finding the right checker is key to keeping your work honest.
Don’t worry about wasting time and money.
We have checked all the top options for you.
The list below breaks down the nine best programs you can start using today.
1. GPTZero (⭐4.8)
This is a top tool for checking if 제니 vs 라이트소닉: 2025년 최고의 AI 작가 7 is AI-written.
It is super accurate. Teachers and writers really trust it.
It shows you the text’s originality score.
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.
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2. Originality AI (⭐4.5)
Do you need to check for both AI writing and copied text?
This tool does both very well. It is popular with bloggers and businesses.
It gives you a fast and clear report.
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.
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3. QuillBot (⭐4.0)
Most people know QuillBot for paraphrasing.
But it also has a good plagiarism checker.
It is simple to use and finds standard copied text easily.
It is a solid choice for students.
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。
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4. Winston (⭐3.8)
Winston is a great AI detection tool.
It focuses on finding AI content with high accuracy.
It also has an AI image 検出器. It’s a nice all-in-one check for content creators.
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.
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5. Phrasly AI (⭐3.5)
This tool is made to “humanize” AI-written text.
It also has an AI detector built right in.
それはあなたを助ける 作る sure your content sounds natural. You can use it to avoid AI flags.
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。
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6. Quetext (⭐3.3)
Quetext uses something called DeepSearch™ Technology.
This helps it find more complex matches. It goes beyond simple word checks.
The color-coded reports are easy to read.
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.
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7. Undetectable (⭐3.2)
The name says it all, right?
This tool tries to make AI text pass human checks.
It is primarily a content rewriter.
It is a good choice if your main goal is to bypass detectors.
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。
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8. Smodin (⭐3.0)
Smodin is a large writing platform.
It has an AI 作家 and a plagiarism checker.
It checks your text against many sources.
It’s a multi-tool for many writing needs.
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.
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9. Grammarly (⭐2.8)
Grammarly is famous for fixing grammar.
The Premium version also has a plagiarism check.
It is very easy to use since you might already use it.
It is great for basic checks.
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。
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バイヤーズガイド
During our research to find the go-to solution for Copyleaks Alternatives, we determined the best choices based on a few critical factors.
We did not just paste text into plagiarism tools and call it a day.
Instead, we focused on what truly matters to professional writers, content marketers, and educational institutions in 2025.
This involved deep diving into the capabilities of each plagiarism detection software.
It ensures we are recommending the best fit for ensuring content originality and content authenticity.
最適な製品を見つけるための調査では、次の要素に基づいて決定しました。
- AI Content Detection Accuracy: This was the most important factor. How well did the software detect AI-generated text and AI-written content versus human-written content? We checked for false positives—when original human-written text is wrongly flagged as AI—and looked at the ability to detect content from the latest AI models. We gave extra points for high AI score reliability.
- Plagiarism Detection Capability: We looked at the core function: How well did the tool find plagiarism? We checked whether it could identify instances of plagiarized content and self-plagiarism, and compare them against multiple documents or just the web. We also checked the clarity of the plagiarism score and how easy it was to get a detailed analysis or a PDF report.
- Pricing and Accessibility: We analyzed the subscription plan and paid plans, focusing on any credit-based system. Did they offer a limited free version or free access? Was there a reliable free version or free plan for individual users? We prioritized accessible tools for new users and noted how limited free access was.
- Target Audience and Specific Features: Was the tool specifically designed for academic integrity in academic papers or for professional settings, like content verification for online content? We looked for features like LMS integration, the ability to upload documents, and how easy the simple interface made it to run drafts. We also checked if they offered a solution like Copyleaks, but better.
- Versatility and Performance: Could the software check multiple languages or only English? We looked for support for other languages and different languages. How fast did it process large volumes of text? Did it compare well to other tools and popular tools? Finally, we noted the frequency of false alarms and the overall user experience.
まとめ
We have reviewed the nine best alternatives to Copyleaks.
The main goal was to help you find a tool that excels at plagiarism detection and new AIツール.
We looked at all the key factors like accuracy and cost.
Remember, top choices like GPTZero offer a great free tools experience.
Others, like Originality AI, focus on a powerful premium plan for professionals.
Finding the right software is about choosing features that matter most to you.
This list of great tools lets users check for both copying and the latest Copyleaks AI detector challenges.
Pick the one that fits your budget and needs today!
よくある質問
What are the main differences between Plagiarism and AI detection?
Plagiarism checks for similar text against existing sources, ensuring originality. AI detection analyzes writing patterns to predict if a machine wrote the content. Both are needed to ensure content originality in today’s world.
Do I need a single platform for both Plagiarism and AI checking?
Yes, for efficiency, finding one platform that handles both is best. This saves you time and money, giving you both a plagiarism score and an AI score in one go. Many users prefer this simple, consolidated approach.
What is the most critical feature for professional use?
For professional use, the ability to generate detailed reports is key. These reports break down exactly where copied or AI-generated text was found, allowing users to make precise edits quickly and maintain high standards.
Can AI-written content pass a traditional plagiarism checker?
Often, yes. AI generates new text sequences that do not match existing sources, so they contain no similar text. That is why a dedicated AI detector is necessary alongside traditional plagiarism tools to verify authenticity.
Why should I choose a premium plan alternative over the free tools?
Premium plan alternatives often offer unlimited scans, better support, and higher accuracy for professional use. While free tools are great for basic checks, paid options give you the high-level security and detailed reports needed for commercial work.
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