AI Detector

ZeroGPT

Free AI content detection tool that highlights sentence by sentence and provides AI content ratio, supports batch files, multilingual support and report export, and also has supporting tools such as image/video detection and rewriting.

GPTZero

An AI text detection tool with over 17 million users, according to the official site. It provides overall AI probability scores and sentence-level results for ChatGPT, GPT-5, Gemini, and other models, plus writing verification, plagiarism checks, and classroom tools.

Turnitin

An academic integrity platform for educational institutions, officially claiming cooperation with more than 16,000 institutions worldwide; AI writing detection is provided as an additional feature of Similarity Report and is only visible to teachers and administrators.

Scribbr

An academic writing platform for students offers free AI detectors, plagiarism checks, citation generation, and manual proofreading and polishing. The single AI detection limit is 1,200 words. It supports four languages: English, German, French, and Spanish, and can distinguish between AI-generated content and AI-polished content.

Pangram

Pangram is an AI content detector that identifies text and images generated by ChatGPT, Gemini, Claude and other models, targeting colleges and enterprises, and emphasizes third-party verified accuracy and content transparency.

Copyleaks

A text authenticity platform for enterprises and educational institutions, offering AI detection, plagiarism check, code plagiarism, and AI video detection. Officially, it supports more than 30 languages with a false positive rate of 0.03%, and can be integrated with various LMS via API.

Undetectable AI

Place AI detection and text humanization on the same platform, with additional AI image, PDF and audio detection, Chrome extensions and APIs; the official claims support for more than 50 languages, tiered subscriptions based on word count, and compliance boundaries should be noted for rewriting functions.

Originality.ai

An AI detection tool for content teams and educational scenarios that can check AI probability, plagiarism, grammar and fact-checking in a single scan; supports Chrome extension, Moodle and API, and verifies authorship with writing playback.

AI Humanize

A rewriting tool for AI-generated text that rewrites the content produced by large language models into expressions closer to human writing, offers a variety of tones and scenario modes, allows locking keywords and citations, and provides AI detection scoring references.

Phrasly

An online tool that provides free AI detection and plagiarism check, the official website claims that its accuracy in detecting text generated by mainstream models reaches 99.8%, with no word limit, results generated in seconds, and specific sentences triggering detection will be highlighted.

AI Detector

Free AI content detection website. Its official website features unlimited word count, supports analyzing about 5,000 words in a single box, offers three entry methods: text, document and URL, and emphasizes using multiple detectors to reach a consensus and reduce false positives.

IsGen.ai

A multilingual AI content detection tool, the official claims it supports more than 80 languages and covers Chinese scenarios. It provides sentence-level and phrase-level analysis, plagiarism detection and grammar checking, along with batch scanning and report generation.

HIX.AI

A creation platform centered on the AI Agent Workbench, which can complete research, slides, documents, images and videos with just one sentence; the platform provides a HIX Bypass text rewriting entry, and supports multi-model switching and scheduled tasks.

Sapling

A language model tool platform for developers and enterprises, offering grammar checking, AI detection, auto-completion, rewriting and sentiment analysis. The official claims it identifies 60% more language quality issues than other checkers, and can be integrated via APIs and SDKs.

Winston AI

An AI content detection tool for education, publishing and SEO teams, with an official accuracy rate of 99.98%; it supports OCR recognition of scanned documents, sentence-by-sentence prediction graphs, plagiarism check and AI image detection, and can generate shareable authenticity reports.

WriteHuman

A tool that combines AI text humanization and AI detection, offering Standard and Enhanced modes, with built-in sentence-level AI probability detection, and supporting Chrome extensions and mobile applications.

Zhuque AI Detection

Tencent has launched a free AI-generated content detection tool. Trained on a variety of advanced models and millions of data points, it delivers particularly outstanding performance in Chinese detection. It supports both text and image detection and provides an API for easy integration into review processes.

Humbot

A platform positioned as a "one-stop AI learning assistant" integrates AI humanized rewriting, AI detection and plagiarism check in one place, and also provides learning tools such as math problem solving, grammar checking, summarization, ChatPDF and citation generation.

PlagiarismCheck.org

An online plagiarism check and originality detection service for teachers and students, which provides similarity percentages and traceable original text links, also offers AI detection capabilities, and supports integration with various mainstream teaching platforms.

AI or Not

An AI detection service covering images, text, music, speech and video, which can distinguish AI-generated content from deepfakes. The official website claims an accuracy rate of 98.9%. It offers a free sandbox, API and pay-as-you-go pricing, and supports on-premises deployment.

CNKI AIGC Detection

CNKI's plagiarism check and AIGC detection services for individual users adopt the adaptive multi-order semantic fingerprint detection technology, which discriminates the AI generation features of text through two links: language patterns and semantic logic, according to the official statement.

BypassGPT

A leading AI-powered humanization tool for text, officially named AI Humanizer, allows one-click rewriting and self-checks for AI detection and repetition rate. It supports multiple languages and APIs, and offers free credit for trial use.

Smodin AI Detector

The AI content detection tool under Smodin, according to its official website, can identify text generated by mainstream models, covers more than 100 languages, and supports pasting text or uploading documents for quick scanning and providing probability scores.

StealthGPT

A humanized rewriting tool for AI text content, officially claiming to handle perplexity and burstiness at the model level with built-in detector verification, supporting a Chinese interface, and stating on its website that it serves over one million users.

Studycorgi ChatGPT Detector

Free AI detection tool for essays on the StudyCorgi platform. After pasting text, it provides word-level probability analysis, marks words most likely written by AI with four colors, and supports clicking to view replacement suggestions.

Quetext

An online service that integrates plagiarism checking and AI detection into a single workspace. Its official website uses DeepSearch technology to search billions of sources, provides color-coded feedback and sentence-level AI detection, and is equipped with writing tools such as rewriting, summarization and citation generation.

Ghost Font

Ghost Font is a font experiment against AI recognition. It writes text into videos using moving dot matrices, which are readable to the human eye but, according to the official website, hard to restore by mainstream models. Screenshots cannot leak the content, and local previewing and exporting are available.

A plagiarism and AIGC detection platform for Chinese academic writing (operated by Zhishu Shuhui) offers free plagiarism check, intelligent similarity reduction, AIGC reduction, format detection and self-built database. The report supports sentence-by-sentence annotation and source traceability.

Netus AI

Put AI humanization rewriting, AI detection and multi-model chat under the same account. The official states that detection is free with unlimited times. The writing tool supports 36 languages, and there are also Chrome extensions and Google Docs plug-ins.

NetEase Yidun

A digital content risk control platform under NetEase Intelligence, providing text, image, audio, video detection and AI face anti-forgery, covering the full life cycle risk control of AIGC, business security and application security.

A veteran web plagiarism detection service that checks if content has been copied from public web pages. Its official website states that it has been used in the publishing, SEO, and education sectors for more than two decades. The Premium version offers bulk search, API access, and automatic monitoring.

PaperYY

The thesis plagiarism detection platform under Wuhan Yiciyuan provides thesis plagiarism detection, AIGC plagiarism detection and rewriting, intelligent rewriting, class team plagiarism detection and self-built library comparison, and is equipped with PDF conversion, translation and polishing tools.

Illuminarty

An AI detection service that supports both images and text. The official stated that it can provide generation probabilities, mark generated image areas and suspicious paragraphs, cover tampered images and Deepfakes, and the free tier is available for long-term use.

Deepware

An online scanning tool dedicated to deepfake video detection. You can paste video links or upload files to determine whether a video has been synthesized or tampered with. It is officially marked as still in beta, and the results are for reference only. An enterprise-level on-premises deployment solution is also provided.

Weipu AIGC Detection

The Weipu Paper Detection System provides plagiarism check, format checking, AIGC detection and intelligent evaluation services, which are distinguished by versions for college students, postgraduates, editorial departments and professional titles, and supports unified management of personal versions and institutional versions.

Daya

The document detection system under Chaoxing provides similarity detection, AIGC detection, format detection, one-click typesetting and AI intelligent evaluation. The official claims that it relies on book resources to achieve dual detection of books and periodicals.

PlagiarismSearch

PlagiarismSearch is an online plagiarism and AI detection service that outputs similarity rates and matching sources, while also providing paper analysis, readability checks, and spell checks. Its official website states that it supports APIs and instant messaging robots.

NoPlagio

NoPlagio is a plagiarism and AI detection tool for Italian-speaking users. Its official website states that it supports plagiarism check for 129 languages and their translations, and marks rewrites, citations and similar fragments with different colors.

Hehe Information

Shanghai Hecheng Information Technology Co., Ltd. is officially positioned as a leader in multimodal large model text intelligent technology. It owns Scanning Master, TextIn and Qixinbao, and has launched a multimodal trusted AI anti-counterfeiting system.

Reality Defender

Reality Defender focuses on deepfake detection, using multimodal capabilities to identify forged audio, video, images and text, and integrating into channels such as calls, conferences and logins to block fraud risks.

uPass AI

uPass AI is an AI detection and text rewriting tool for students. Officially, it claims to make rewritten text harder to detect while reducing repetition rates, and it aggregates results from multiple detectors for self-checks.

Proofig AI

Proofig AI is an image integrity review tool for scientific research publishing. It detects image tampering, repeated reuse, and AI-generated images. The official statement says it is used for self-checks before submission to reduce the risks of rejection and retraction.

Gezi Da

A workbench for academic content detection, which provides one-stop services including paper plagiarism check, format detection, format correction and AIGC detection. It supports tracking the status after uploading and unified management of detection records, serving the paper writing and self-inspection scenarios of university teachers and students.

Lettertrace

Lettertrace is an open-source AI visibility monitoring tool with a built-in proprietary key: after entering a topic, it automatically expands into dozens of questions, asks Claude, ChatGPT, and Gemini, counts mentions, rankings, emotions, and competitor voice share one by one, and can also generate trend lines at regular intervals.

AgentCloak

According to the official website, AgentCloak is InCountry's sensitive data protection solution for AI and enterprise applications: it can detect and replace sensitive data at touchpoints such as chat, CRM, and CDP, provide synthetic data, tokenization, hashing, and masking, restore data according to authorized identities, and support browser extensions, proxies, and sovereign residency.

GetReal Security

GetReal Security is a deepfake detection platform for enterprises. It real-time identifies fake identities in video calls, voice and recruitment processes, and intercepts identity fraud such as impersonating CEOs and fake candidates.

CopyFind

CopyFind is a free online plagiarism and AI content detection tool. You can paste text or upload documents to compare web page duplicates and rewrite traces. The official website states that uploaded files are not saved, and it supports comparison with target websites.

The AI-generated content detection tool jointly launched by the State Key Laboratory of People's Network, University of Science and Technology of China, and the Institute of Artificial Intelligence at Hefei Comprehensive National Science Center supports text and image detection and provides confidence levels.

Wenchao

The academic quality inspection platform launched by Wanfang Data can simultaneously complete multi-element detections such as text similarity, text AIGC, image reuse, reference risk and language specification in one submission.

RealAI

Positioned as a safe and controllable provider of artificial intelligence infrastructure, its subsidiary DeepReal specializes in generative content detection. It also offers AI security platforms, facial security firewalls, and privacy computing products, serving government and financial scenarios.

Zhongke Ruijian

The product targeting AI anti-counterfeiting scenarios is officially said to provide a full-process solution for detection, evidence collection and traceability based on multimodal forgery detection technology, covering public security, financial security and educational media security.

Xiaoxiangpi

Xiao Xiangpi AI is a de-AI-style rewriting tool that specializes in one-click humanization. According to the official statement, it can transform AI-generated articles, notes, broadcast scripts and marketing copy into expressions that are more similar to real human speech, and also provides functions such as forbidden word scanning, traffic risk prediction and platform rule intelligence reference.

Orwellix

Orwellix is an AI writing agent workbench. Agent Mode edits documents directly, while built-in grammar and style annotations, plagiarism checking, cloud storage, and multi-format export streamline the writing process. The free plan includes 25 AI credits each month.

ProofWrite Guest Post Checker

ProofWrite is a fact-checking AI writer that traces every factual claim back to its source passage. It supports batch verification of published articles and offers free tools, including a check for whether a site is being cited by AI.