Best Free AI Content Detection Tools of 2025

Grammarly

Compose bold, clear, mistake-free writing with Grammarly’s AI-powered writing assistant. Grammarly now organizes your writing feedback by theme, so you can see how each change will help your readers better understand your message. Get corrections from Grammarly while you write on Gmail, Twitter, LinkedIn, and all your other favorite sites. From grammar and spelling to style and tone, Grammarly helps you eliminate errors and find the perfect words to express yourself. Get started for free and find out what you can accomplish with the power of Grammarly at your fingertips. With Grammarly Business, every member of your team can compose credible, mistake-free writing that makes your business look good. Every email, web page, and social media post makes an impression on your customers. With Grammarly, you can be confident it's the right impression. High-quality writing is more than just mechanics. Grammarly Business goes deeper with real-time suggestions for improving readability.

38 Ratings

Starting Price: $12 per month

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Krater.ai

Krater.ai is a comprehensive and user-friendly platform that offers a range of AI-powered tools and services. Our platform provides a powerful alternative to all major AI services, tools and apps in one convenient and elegant location. You no longer need to switch between multiple apps and accounts that have different log-ins and pricing plans. With Krater.ai, you can generate 100% plagiarism-free content in a matter of seconds. Our AI-powered tool and templates ensure that your content is always original, allowing you to focus on creating high-quality content that resonates with your audience. Whether you're a marketer, content creator, or small business owner, Krater.ai has a pricing plan that suits your needs. We offer competitive pricing plans that are tailored to meet your specific requirements. Plus, we have a free plan that you can try out without the need for a credit card.

7 Ratings

Starting Price: $7 per month

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Zhuque AI Detection Assistant

Tencent

Tencent’s Zhuque AI text detection assistant uses multiple advanced AI models trained on vast datasets to recognize writing patterns from both humans and AI. It is highly effective in detecting AI-generated text in English and performs exceptionally well with Chinese content. In addition to text, Zhuque offers an image and video detection tool that determines if media is fully AI-generated or human-created. This detector is trained on millions of images and videos spanning photography, digital art, paintings, posters, movies, and short videos. It currently supports detection for outputs from major AI generation models in the market. The system continues to expand its capabilities to cover more AI models over time.

1 Rating

Starting Price: $0

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Smodin

AI is uniquely positioned to remove some of the biggest learning roadblocks facing students and writers today: writer's block, information overload, and conceptual gaps. Smodin is a multilingual student-focused company using AI to address students’ largest learning challenges. Inspired by the biggest challenges students and writers face, Smodin’s mission to make writing as stress-free as possible. We at Smodin believe writing shouldn’t hold anyone back. Be it language, understanding, or low talent, writing should be an avenue where anyone can express themselves completely, unimpeded. Currently a team full of intellectual and ambitious developers and product-focused innovators. We are placed throughout the globe, largely in Islamabad, Pakistan. We make it our priority that everyone works on impactful projects they enjoy. The team is currently led by our developer CEO, and we've taken a strong technical and product-focused mindset for what we do.

2 Ratings

Starting Price: $8 per month

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Content at Scale

Content at Scale is an AI content writing platform that empowers SEO marketers to create high-quality, engaging, and fully original content in a scalable and efficient manner. Its advanced AI technology can generate long-form, research-backed 2,500+ word SEO blog posts in just five minutes, crawling Google on the spot to parse top-ranking content and put together an entire long-form SEO blog post. This is not an AI writing assistant, but a human-level long-form machine. With over 40 million words produced per month by users, it can write long-form SEO content for any industry and general informational search terms. By adapting to its innovative AIO model, Content at Scale helps agencies and marketers save 10-25x on the typical time and cost of human-only content creation. Its user-friendly interface makes it easy for anyone to create content structured for search, even those with no prior experience in SEO content. Content at Scale also offers an AI content detection tool.

Starting Price: $250/month

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Leap AI

Create beautiful images effortlessly with AI Image Generator tool by Leap AI AI Image Generator tool by Leap AI helps you create stunning images from text prompts, which can be useful for various purposes such as marketing, content creation, and personal projects. It ensures you have high-quality visuals to enhance your work. To get the best results, provide detailed and descriptive text prompts. The more specific your input, the more accurate and visually appealing the generated images will be.

Starting Price: $7 per month

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Sapling AI Writing Assistant

Sapling Intelligence

AI writing assistant for customer-facing teams. Sapling sits on top of CRMs and messaging platforms to help agents more efficiently compose personalized responses. Managers gain conversational insights to coach and prepare teams. Sapling provides functionality for autocomplete, spelling and grammar checking as well as snippets/canned messages/text expander. All services can be self-hosted, provided on-premise or cloud-premise to meet enterprise security and privacy requirements. Spelling and Grammar checking APIs allow users to integrate Sapling's language models into custom applications and use cases. Sapling Suggest retrieves relevant responses from a team knowledge bank and allows agents to respond more quickly to customer inquiries by simply clicking on the desired response. Empower agents instead of providing brittle, decision tree-based chatbots.

Starting Price: $25 per month

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Copyleaks

We’re a leading AI text analysis platform dedicated to empowering businesses and educational institutions as they navigate the ever-evolving landscape of genAI through responsible AI innovation, balancing technological advancement with integrity, transparency, and ethics. Since our founding in 2015, we’ve harnessed the power of AI to empower authenticity and originality. With an award-winning suite trusted by millions, we ensure AI governance and responsible AI adoption, safeguard IP, confirm copyright compliance, and maintain academic integrity with comprehensive content detection. Copyleaks, where technology meets integrity. The AI Grader By Copyleaks is a cutting-edge AI test grader that boosts efficiency, reduces errors, removes all bias, and accurately grades thousands of tests in minutes.

Starting Price: $7.99

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GPTZero

GPTZero turns the very technologies used to build ChatGPT around — to detect AI. It uses variables like perplexity to fingerprint AI involvement. GPTZero is committed to keeping a version of GPTZero classic permanently free and accessible for any human to use. Try out yourself the original demo that everyone on the internet is talking about. We're building a tailored solution for educators to responsibly adopt AI-technologies in schools.

Starting Price: Free

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Kazan

So this is a totally free content optimizer based on co-relation to the top 10 Google results for any given keywords, this includes entities, NLP, and it’s totally transparent without hiding or making up keywords for you to optimize. That’s right, you heard it, a free forever and unlimited content optimizer. It grabs the top 10 results in google for any given phrase, extracts its content (including anchors), and co-relates its content to find similarities of keywords they use if there’s a consensus of the majority of the results (6 or more) it then adds it to a list of keywords you should include into your content, it averages it out the occurrences of those keywords in the top 10 results and it guides you into including those keywords into your content. Unlike competitors, we will be free forever and unlimited. The tool's in development, any features you want to be added post them in the FB group. You should optimize your articles more than once to keep up with the top performers.

Starting Price: Free

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Illuminarty

Detect AI-generated images, synthetic, tampered images, and deep fakes. We offer various functionalities to help our users understand the generation of images through AI. Check whether or not an image has been AI-generated, from which AI model it has been generated, and which regions of the image have been generated. Find out the probability of AI generation for a given image. Illuminarty combines various computer vision algorithms to provide the likelihood of the image being generated from one of the public AI generation models. Find out the probability of AI generation for a given text. Illuminarty combines various NLP algorithms to provide the likelihood of the text being generated from one of the public AI generation models. We denote the specific passages from the given text that are most likely the result of AI generation. We are working on a web browser extension that lets us use our detectors while we surf on the internet.

Starting Price: $10 per month

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SciSpace AI Detector

SciSpace

Catch GPT-4, ChatGPT, Jasper, and other AI writers’ presence in scholarly content. Academic integrity is everything even though we’re living in the time of AI writing assistants. SciSpace’s AI detector helps you identify human from artificial in scientific literature. Pair our output with further investigation and ensure you maintain authenticity in academia. Whether you have freeform text or an essay saved as a PDF, you can get quick and easy AI detection reports. All you need to do is paste your content in the text editor or upload your doc. Our AI detector is tailor-made for essays, assignments, and papers. With an accuracy of 98%, it gives reliable results, which should be enough, along with your judgement. for you to take appropriate action. Receive and download a comprehensive report on the whole document as well as on a sentence level, highlighting how much and the parts that are AI-generated text. Edit them and bring down the AI-content score.

Starting Price: Free

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AI Detector Pro (AIDP)

AI Detector Pro

We scour the latest outputs from ChatGPT and other AIs every day and constantly update our recognition algorithm. If you find an AI detector that performs better, send us the results for your money back. AIDP detects AI in English, Spanish, and German documents. From there, it highlights text in your document that triggers AI detectors. For English text, it also shows you text that AI models predict and and highlights overused AI words and phrases.

Starting Price: $13.99

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Nuanced

We detect AI-generated images to protect the integrity and authenticity of your service. AI-generated spam, abuse, and fraud are on the rise. User-generated content platforms are contending with an increased amount of fraud, deepfakes, and inauthentic content. Advanced models generate content that appears authentic and convincingly human-like, making it difficult for established systems to distinguish between genuine human-authored artifacts and AI-generated content. Our algorithms stay ahead of the accelerating changes in AI content generation. Our research team is at the forefront of building scalable models to detect AI-generated content. Our API allows integrators to quickly and easily leverage state-of-the-art AI models so you can focus on your business. Many existing systems compromise user privacy by collecting and utilizing personal data without clear consent. We believe in privacy-first solutions.

Starting Price: $29 per month

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AI or Not

Detect AI-generated images & audio for your business and yourself, with AI or Not. Check for generative AI in seconds to reduce fraud rates and prevent the latest scam. Protect music copyright by detecting if an artist’s voice was used in AI-generated audio. Empower your trust and safety team with AI content detection. Identify deepfakes with accuracy and transparency. Safeguard identity verification and KYC compliance against AI-generated synthetic IDs. AI or Not is a web service that helps users quickly and accurately determine whether an image has been generated by artificial intelligence (AI) or created by a human. If the image is AI-generated, our service identifies the AI model used. We offer the AI or Not API for bulk image analysis and seamless integration into your platform. AI or Not is free to use for analyzing single images. We offer a premium API service for bulk image analysis or commercial use.

Starting Price: $5 per month

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Detecting AI

Discover unparalleled accuracy and ease with our AI checker, trusted by experts for superior AI content identification. Highlights each AI-written sentence, showing the percentage of AI used in the text visually. Engineered for unmatched precision, our AI checker accurately identifies AI-generated content efficiently. Designed for ease of use, our intuitive interface ensures a smooth, straightforward user experience. Begin identifying AI-generated content right away without any account setup. Your submissions stay confidential. We never store or share your data. Our ai checker provides comprehensive coverage of various AI models, enabling us to identify AI-generated content created by ChatGPT, Gemini, Jasper, Claude, and other similar models. We continuously train our system to detect new models like GPT4 automatically, ensuring that our AI detector stays up-to-date with the latest AI technology advancements.

Starting Price: $5 per month

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Codespy

Codespy AI Detector is a powerful tool designed to identify AI-generated code within software projects quickly and accurately. It supports popular programming languages such as Java, Python, JavaScript, C++, C#, and PHP. The platform helps developers find AI-written code from models like ChatGPT, Gemini, and Claude, which can introduce bugs or unexpected errors. Codespy integrates seamlessly with common development environments like Visual Studio Code and is available as a ChatGPT plugin. Its technology enables teams to create processes and guardrails around AI code usage to reduce risk and improve code quality. With simple pricing plans and no credit card required for the free tier, Codespy is accessible to individuals and businesses of all sizes.

Starting Price: $27.98/month

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Avoid.so

Avoid.so is a powerful AI humanizer platform that transforms AI-generated text into human-like writing designed to bypass major AI detection systems such as GPTZero, Turnitin, Originality.AI, Copyleaks, and others, with a reported 99.8% success rate. It supports content in 50+ languages, preserving the original message, tone, and intent while adapting AI patterns into more natural expression. The platform delivers lightning-fast processing capable of humanizing thousands of words in seconds, powered by enterprise-grade infrastructure with SOC 2 compliance and 99.99% uptime. Functioning on a credit-based system, users receive 600 free word credits to start, with various paid tiers offering monthly word quotas and request limits tailored to usage needs. High-volume users and businesses benefit from premium AI detection avoidance, priority processing, API access, custom integrations, and dedicated account management on advanced plans.

Starting Price: $4.99 per month

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OpenAI Output Detector

Hugging Face

This is an online demo of the GPT-2 output detector model, based on the 🤗/Transformers implementation of RoBERTa. Enter some text in the text box; the predicted probabilities will be displayed below. The results start to get reliable after around 50 tokens.

Starting Price: Free

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ZeroGPT

ZeroGPT is the most accurate and reliable tool to detect AI written content, like ChatGPT generated content.

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Enago Reports

Enago Reports represents an extensive collection of reports that harness the capabilities of advanced artificial intelligence. These reports play a crucial role in assessing and enhancing the quality, integrity, and impact of multiple categories of documents in a fast, accurate, and detailed manner. Leveraging the extensive expertise accrued by Enago over 17 years, it efficiently enhances any document to ensure it achieves its maximum potential impact. It is tightly integrated with Trinka.ai, an AI-powered complete writing assistant. Together, it creates a tech ecosystem in which one can seamlessly work with Enago Reports and Trinka to maximize productivity in writing and evaluating manuscripts. Enago is a part of the Crimson Group which has been a trusted name in author services including top-notch English editing, localization, translation, transcription, and much more since 2005. Enago has supported 2 million+ authors in 125+ countries, enhancing their research communication f

Starting Price: $12 per month

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ZeroGPT Plus

MegaByte

ZeroGPT Plus is a free AI Content Plagiarism Checker that doesn't require a login. It's designed to spot content created by AI tools like ChatGPT, Gemini, Claude, and Copilot. Using advanced technology, it checks texts against a large database to find signs that content might have been generated by AI. Plus, this tool can also make AI-written content sound more human and natural. You can even choose from different languages and styles to suit your needs.

Starting Price: $0

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X Detector

X Detector is an advanced tool that supports more than a dozen major languages, including Chinese, English, and French, effectively covering all widely spoken languages around the world. No matter which language you speak, X Detector can accurately identify with amazing precision. Leveraging advanced AI algorithms, X Detector stands out in detecting AI-generated content with outstanding accuracy. This ensures that users can rely on the tool to provide reliable results for all their detection needs. The tool's advanced technology enables it to quickly analyze input text, provide feedback within seconds, and significantly improve the efficiency of AI content detection. X Detector's user-friendly interface makes it extremely easy to use. Whether you are a professional looking for reliable detection capabilities or an individual looking for a simple yet effective solution, X Detector can meet your needs, ensuring that you get accurate and efficient results every time.

Starting Price: Free

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Advacheck

Advacheck is a comprehensive solution for originality verification and plagiarism detection, designed for academic institutions, research organizations, and corporations. Key features include: Text Analysis: AI-powered algorithms verify originality by comparing text with an extensive database of academic publications and web content. Cross-Language Detection: Identifies plagiarism across different languages. AI Content Detection: Detects AI-generated text to support academic integrity. Image Verification: Compares visual content against a growing database of images from articles and user collections. LMS Integration: Seamlessly integrates with Moodle, allowing assignment checks directly within the learning platform. Reports & Customization: Generates detailed reports with sources and allows for tailored detection settings. Advacheck ensures high standards of data security and privacy, compliant with international regulations.

Starting Price: $9

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Undetectable Content

Undetectable Content - AI Humanizer & Detector. Our Undetectable AI Content humanizer converts your text into human-like, grammatically accurate, plagiarism-free content that remains undetectable by AI detectors. Features: AI Humanizer, AI Detector, AI Writer, Bypass AI Detectors, Plagiarism-free content, Grammatically accurate Instantly identify and humanize AI-generated content. Improve authenticity, enhance readability, and ensure your content bypasses all major AI detectors with just one click.

Starting Price: $0

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GLTR

The aim of GLTR is to take the same models that are used to generated fake text as a tool for detection. GLTR has access to the GPT-2 117M language model from OpenAI, one of the largest publicly available models. It can use any textual input and analyze what GPT-2 would have predicted at each position. Since the output is a ranking of all of the words that the model knows, we can compute how the observed following word ranks. We use this positional information to overlay a colored mask over the text that corresponds to the position in the ranking. A word that ranks within the most likely words is highlighted in green (top 10), yellow (top 100), red (top 1,000), and the rest of the words in purple. Thus, we can get a direct visual indication of how likely each word was under the model.

Starting Price: Free

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Detect GPT

thomas.io

Find out if the pages you browse contain AI-generated content. Detect GPT scans the content of the webpage you are viewing and analyzes it to identify if any of the content has been generated using the GPT language model.

Starting Price: Free

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SEOByAI

SEOBy.ai helps you kickstart your marketing efforts and rank higher on search engines without spending a dime. Get organic traffic to your website/landing page and sell more of your products. SEO is so important, especially for startups with little marketing budget. You can beat your competition if you follow SEO best practices, rank higher than them and get free organic traffic (aka eyes 👀) on your website and landing page. ✅ 100% free, forever. ✅ Follows best practices ✅ Find out relevant keywords with our AI SEO Keyword tool. ✅ Find out if content was generated by AI or by a human with our AI Content Detector. ✅ AI generated topic clusters based on relevant keywords ✅ AI title generator ✅ AI paragraph generator / paragraph rewriter ✅ AI product description generator ✅ AI sentence rewriter ✅ AI paraphrase tool ✅ AI spellcheck & lots more to come. I'll be adding more free SEO tools to SEOBy.ai over this year, alongside the other projects I'm working on

Starting Price: $0

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Detector Pro

Detector Pro is your ultimate weapon against the AI invasion. Cut through synthetic content with razor-sharp accuracy, exposing fake text and images in an instant. For publishers, marketers, and defenders of authenticity, Detector Pro doesn’t just detect AI—it destroys it. In a world flooded with fakes, only the real gets through.

Starting Price: $25/month

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Rewritify

Rewritify is an AI-powered tool designed to rewrite your text, ensuring it's free from plagiarism and easy to read. It enhances the uniqueness and engagement of your content while optimizing it for search engines, making your writing stand out. Use Cases: - Enhance Readability: Smooth transitions and improve clarity. - Generate Unique Content: Create original, plagiarism-free text. - Optimize for SEO: Incorporate keywords for better search rankings. - Repurpose Content: Update and adapt old materials for new uses. Ideal for: - Content Writers: Freshen up articles and blog posts. - Marketing Copywriters: Create varied marketing materials. - Content Marketers: Repurpose existing content efficiently. - Students: Ensure originality in essays and assignments.

Starting Price: $9/month

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Best Free AI Content Detection Tools

Compare the Top Free AI Content Detection Tools as of September 2025

What are Free AI Content Detection Tools?

Grammarly

Krater.ai

Zhuque AI Detection Assistant

Smodin

Content at Scale

Leap AI

Sapling AI Writing Assistant

Copyleaks

GPTZero

Kazan

Illuminarty

SciSpace AI Detector

AI Detector Pro (AIDP)

Nuanced

AI or Not

Detecting AI

Codespy

Avoid.so

OpenAI Output Detector

ZeroGPT

Enago Reports

ZeroGPT Plus

X Detector

Advacheck

Undetectable Content

GLTR

Detect GPT

SEOByAI

Detector Pro

Rewritify

Best Free AI Content Detection Tools

Compare the Top Free AI Content Detection Tools as of September 2025

What are Free AI Content Detection Tools?

Grammarly

Krater.ai

Zhuque AI Detection Assistant

Smodin

Content at Scale

Leap AI

Sapling AI Writing Assistant

Copyleaks

GPTZero

Kazan

Illuminarty

SciSpace AI Detector

AI Detector Pro (AIDP)

Nuanced

AI or Not

Detecting AI

Codespy

Avoid.so

OpenAI Output Detector

ZeroGPT

Enago Reports

ZeroGPT Plus

X Detector

Advacheck

Undetectable Content

GLTR

Detect GPT

SEOByAI

Detector Pro

Rewritify

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