Best Plagiarism Checker Software in the USA of 2026

Semrush

Semrush One is an all-in-one digital marketing platform designed to help brands win visibility across search engines, AI platforms, and emerging discovery channels. It unites traditional SEO tools with advanced AI search and GEO capabilities to measure and grow brand presence everywhere users search. The platform supports optimization across Google, ChatGPT, Perplexity, Gemini, and more from a single interface. Semrush One offers toolkits for SEO, content marketing, traffic analysis, local search, advertising, social media, AI visibility, and digital PR. Powered by one of the world’s largest AI-driven marketing databases, it delivers deep insights competitors can’t easily replicate. Enterprises and marketers use Semrush One to forecast traffic, revenue, and ROI with confidence. Trusted by millions of professionals and global brands, Semrush One acts as a central growth engine for digital visibility.

6,459 Ratings

View Software

Visit Website

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

View Software

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.

26 Ratings

Starting Price: $8 per month

View Software

StudyAgent

StudyAgent is an AI-powered academic writing assistant designed to help students, researchers, and professionals write smarter and faster. It brings everything you need for academic success—structuring, writing, checking, and refining your work—into one integrated platform. Trained on billions of scholarly papers and research studies, StudyAgent generates content that is accurate, logical, and academically sound. Its tools include an AI Writer, plagiarism checker, AI detector, and paraphraser, all built specifically for academic use. Unlike generic writing platforms, StudyAgent adapts to your tone and field of study while maintaining originality and compliance with academic standards. With core features completely free during beta, StudyAgent turns the complex writing process into a simple, guided experience.

13 Ratings

View Software

Trinka AI

Trinka AI is a privacy-focused grammar checker and writing assistant designed for academic and technical writing. Created by language and science experts, it detects and corrects various intricate writing errors such as contextual spelling mistakes and advanced grammar issues. Additionally, Trinka suggests improved vocabulary choices and offers real-time writing tips to help professionals and academics write clearly, formally, and engagingly. By adapting to different subjects, Trinka ensures that its corrections align with the specific nuances of each topic, maintaining high professional standards in writing.

10 Ratings

Starting Price: $6.67/user/month

View Software

Originality.ai

Originality.ai is a powerful AI detection and content quality platform designed to help users verify whether text is human-written or AI-generated. It accurately detects content created by models such as GPT-5, ChatGPT, Claude, and Gemini. The platform combines AI detection with plagiarism checking, grammar analysis, readability scoring, and fact checking in one suite. Originality.ai is trusted by editors, publishers, students, and marketers to maintain transparency and integrity in written content. Its AI checker highlights sentences and explains why content may be flagged as AI. The platform is backed by third-party studies showing industry-leading accuracy across multiple LLMs. Originality.ai enables users to confidently publish or submit content knowing it meets originality standards.

10 Ratings

Starting Price: $0.01 per 100 words

View Software

PlagiarismSearch.com

PlagiarismSearch.com is a leading plagiarism checking website that will provide you with an accurate report during a short timeframe. Prior to submitting your home assignments, run them through our plagiarism checker to make sure your content is authentic. Due to a new multi-layer algorithm technology in our plagiarism search engine, no one will be able to accuse you of plagiarism, whether in your academic papers (essays, research papers, coursework etc.), articles, or blog posts. Being cost-effective, PlagiarismSearch.com offers excellent online plagiarism checker for almost everyone, therefore, now you can check your papers for plagiarism at any time using your computer or gadget and internet connection. It is not merely about the plagiarism detection; it is also about saving your time now and in future. Use our professional plagiarism checker to save your time and money. Enjoy affordable accuracy with PlagiarismSearch.com.

6 Ratings

Starting Price: $7.95 per submission

View Software

ProWritingAid

Orpheus Technology

Companies using ProWritingAid produce higher quality content, comms, reports, bids and other documents with fewer mistakes, faster. ProWritingAid eliminates common error types, inconsistent terminology, contextual spelling errors, grammar mistakes, and poor writing style. A wide range of integration options, including API and on-premise solutions, supports all sizes of organization, including those with high-level security and privacy requirements.

2 Ratings

Starting Price: $79.00/year/user

View Software

QuillBot

Your words matter, and our paraphrasing tool is designed to ensure you use the right ones. With 3 free modes and 4 premium modes to choose from, QuillBot’s paraphraser can rephrase any text in a variety of different ways, guaranteeing you find the perfect language, tone, and style for any occasion. Just enter your text into the input box, and our AI will work with you to build the best paraphrase from the original piece of writing. Use the Synonyms to change more (or less) of your writing. Click on any word in your writing to find the right synonyms and get your perfect word! QuillBot integrates directly into Google Docs and Chrome Extension. No more switching windows every time you want to Paraphrase text! No matter who you are or what you do, QuillBot has writing and research tools to support you in making your work come alive.

2 Ratings

View Software

Grammica

To find grammar, spelling, punctuation, plagiarism, and syntax mistakes in your work, Grammica utilizes a highly sophisticated machine-learning algorithm. Your work is extensively examined in real-time by our English grammar checker. Our clever writing helper tool puts your content through a sophisticated algorithm that analyses the context of your writing to identify grammar mistakes. It shows a brief overview and the sort of fault it has found.

1 Rating

Starting Price: $0

View Software

Copyscape

Indigo Stream Technologies

Copyscape's professional solutions provide more powerful plagiarism detection than the free service. They are used by webmasters and content owners worldwide to check the originality of new content, prevent duplicate content, and track down copies of content on the web. Copyscape Premium is the web's most powerful plagiarism detection service, ranked #1 by independent tests. Check the originality of new content by pasting the text directly into the search box or uploading a file. Perform unlimited scans for copies of your web pages. Other advanced features include Batch Search, Private Index to check for duplication within your own content, case tracking and follow-up, team management tools and an API. Copysentry protects your site against content theft by monitoring the web daily or weekly for copies of your content and sending you email when new copies appear. Copysentry's advanced features include case tracking and follow-up and a browser for viewing previous results.

1 Rating

Starting Price: $4.95 per month

View Software

Plagly

Instantly compare your text to over 20 billion sources using our free checker tools. We've created the fastest and most accurate free plagiarism checker tool to help students, teachers, and SEO professionals easily and more efficiently detect plagiarism and duplicate content. Plagly's plagiarism checker compares your text to the entire internet and other databases by detecting plagiarized phrases and highlighting sections of content currently published online. Instantly check for grammar mistakes to improve efficiency for writing correct text and content. Eliminate structure and style mistakes by proofreading your articles or content online. Trusted by top colleges and universities the free plagiarism checker for students and teachers online allows students to scan academic papers, essays and assignments for plagiarized text. Plagly is changing the online writing world for plagiarism detection software by developing game changing detection technology.

1 Rating

View Software

Paraphraser.io

The online paraphrase tool has numerous features including, rewriting essays, fixing plagiarism, and rewording articles. Our paraphrasing tool works best as a word changer and sentence rephraser. Paraphraser.io has the art of rephrasing the text on the human level. The final output will be readable, sensible, and plagiarism free. Our free paraphrasing tool is the most advanced AI rewriter based on NLP. It can paraphrase sentences and complete articles. Unlike other online paraphrasing tools, our AI-based paraphrasing tool maintains the original meaning while changing the sentence structure. Our Paraphrase tool generates more readable and grammatically correct content. It does not ruin the quality of the content after paraphrasing. Hence, our paraphrasing tool helps to improve your writing skills and provides you a different way to express your own words.

1 Rating

Starting Price: $20 per month

View Software

StudyXY

StudyXY is an AI-powered study suite that helps students write better, learn faster, and boost grades. ✍️ AI Writer – Draft essays, research papers, and assignments with real citations. 🧮 AI Homework Helper – Step-by-step solutions for math, science, and more. 📄 Document Chat – Upload PDFs or notes and chat directly with them. 🧠 Flashcard Generator – Turn notes into smart flashcards. 📝 AI Test Prep – Create personalized quizzes and mock tests. 🔍 Plagiarism Checker and 🤖 AI Detector ensure originality and academic integrity. StudyXY is ad-free, privacy-focused, and available on Windows, Android, and Web.

1 Rating

View Software

Codequiry

Find unoriginal code and software similarity with the most advanced plagiarism detection solution. Investigate potential copied code by highlighting similarities to billions of sources on the web or from submitted peers. Check the similarity of two or more source codes and view highlighted matches. Codequiry was built around source code detection, this means the results you get are meaningful and reliable. Submissions undergo rigorous checks (more) to ensure that code submissions are original. Put a stop to code copying from peers or the web. Codequiry looks beyond the cosmetics, finding similarities in logic patterns and unique style of code. Altering variables, whitespace, function names, comments, or many other cosmetic features will not affect overall similarity results. Our algorithm is constantly self-improving.

2 Ratings

Starting Price: $35 per month

View Software

WRITER

WRITER is an end-to-end platform for building, activating, and supervising AI agents across the enterprise. It empowers IT and business teams to collaboratively build agents that automate work, improve decision making, and drive business outcomes. With WRITER, teams get a home for their AI-powered work, while builders get intuitive development tools, seamless integrations, and full oversight via approval workflows, logs, and role‑based controls. Powered by WRITER’s Palmyra LLMs and Knowledge Graph, the platform powers accurate, reliable AI agents that meet strict security and compliance standards, including SOC 2 Type II, GDPR, HIPAA, PCI, and the ISO trust triad. With WRITER’s team of AI experts, we turn AI pilots into company‑wide wins for global leaders like Vanguard, Salesforce, Prudential, Qualcomm, and more.

Starting Price: $29 per user/month

View Software

Check-Plagiarism

Check-Plagiarism provides a state-of-art plagiarism checker that helps you avoid plagiarism with robust algorithms. Our plagiarism checker checks your text against billions of web pages, Education databases, Online Resources & Online Libraries to provide accurate results. Check Plagiarism also offers an AI-based Paraphrasing Tool to strengthen your writing, a Text Summarizer, an Article Rewriter, etc.

Starting Price: $4.99 per week

View Software

CopyChecker

CopyChecker is a free, all-in-one online toolkit designed to help writers, students, educators, businesses, digital marketers, and content creators work smarter and more efficiently. Built with a mission to make world-class content tools accessible to everyone, CopyChecker offers a comprehensive suite of text, image, PDF, and video tools — all without requiring software downloads or complex setups. Everything runs directly in your browser. CopyChecker's flagship tool is a fast, accurate, and completely free online plagiarism checker. It scans content against billions of web pages, academic publications, student submissions, and online databases to detect duplicate content. CopyChecker's AI Detector analyzes written content to identify whether it was generated by AI tools like ChatGPT, Claude, Gemini, or other large language models.CopyChecker's most advanced AI Image tool uses artificial intelligence to perform deep visual similarity searches far beyond basic reverse image lookup.

Starting Price: $9.99

View Software

PlagiaShield

Find all content thefts. Get rid of them. Rank better. Content Is King, right? High-quality, unique written posts are one of your best assets. The truth is, your articles are most probably not unique anymore. You would be surprised how quickly they got copied by dozens of websites. Your blog posts lost their value when they went from original to ordinary. Google likes original posts You might be okay with having your exact content copied hundreds of times. Google is not. It takes it into account when ranking pages. After each core SERP algorithm update, the first question you should ask yourself is: "Does the content provide original information, reporting, research or analysis?" (see the full Google note). Being copied is painful enough Fighting content thefts shouldn't be Your content is precious. And so is your time. PlagiaShield is the plagiarism checker that helps you get rid of all copycats in the most efficient way. In a few minutes, find the most fraudulent domains.

Starting Price: $14.90 per user, per month

View Software

Noplag

We help education establishments deal with academic integrity students to learn how to write original papers before they submit them to Turnitin. Upload your files and check new files against them for free. We detect synonyms, character replacement and paraphrased plagiarism. Grammar and spell checker, online editor, citation assistance, human proofreading. Noplag is one of the oldest, well-known and most trusted plagiarism detection services on the internet, which was established in 2014. Since then college students around the world, graduate and undergraduate students rely on Noplag Online Plagiarism Checker every day. Plagiarism checker in students’ life is a necessity nowadays, as it not only helps students prepare for the module, exam or complete homework writing assignment but also educate students, how to write custom papers, motivates students to keep up with the Academic Integrity and not cheating by copying classmates essay or research paper.

Starting Price: $1 per paper

View Software

Quetext

We offer a complete suite of writing and integrity tools designed to support writers at every stage of the process. From identifying plagiarism with our Plagiarism Checker and evaluating content with the AI Detector, to refining ideas using AI TutorMe™ (AI Paraphraser), AI Summarizer, and Grammar Checker, our platform helps writers create clearer, more original work with confidence. Once your tools are in place, accuracy matters. That’s where our technology comes in. Using contextual analysis, intelligent word placement, and advanced algorithms, our software pairs speed with the precision of DeepSearch™ technology. Trusted by more than 5 million students, educators, and professionals, DeepSearch™ scans deeply and intelligently to surface potential issues without slowing you down. Our focus is simple: to promote ethical writing through originality and correct citation. We believe the most effective way to achieve that is by providing intuitive, writer-first technology that empower

Starting Price: $8.25 per user per month

View Software

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/month

View Software

DupliChecker.com

DupliChecker

The DupliChecker.com team comprises of experts in different fields, all with the same primary focus: helping our clients generate greater business by use of online services. We offer a great number of differing SEO services, with the most popular ones being high-quality website content, proofreading, editing of online content, and SEO optimization and website ranking. Create magical content, better performing. Get positions in Google (Position 1-3) and drive more traffic, engagement, and leads. Academic proofreading of (theses, dissertations), fiction and non-fiction), medical documents, journals, essays, website content, and more. Time to look at data to find high-quality content. Start optimizing for engagement and you'll find huge content victories. Search engine optimization gets easier with the help of our 100% free tools to work on each factor. DupliChecker.com is yet another feather in our cap, and one of our proudest and most successful productions.

Starting Price: $10 per month

View Software

WriterZen

Establish domain expertise and drive organic footfalls on your website with high-quality content metrics unearthed straight from the Google database. Demonstrate your expertise with diverse topics that connect with your audience and fill any information gaps. Identify as a knowledge hub with contextually connected articles that stimulate search engine bots to scan the complete website. Shoot up the SERP ranks with topic secrets from your competitors. User insights extracted from ‘Google Suggest’ to identify questions or ideas of interest. In the next step, choose from billions of keywords mined directly from Google Keyword & Google Suggest Database to satisfy customer intent and enhance your credibility. Depend on Zen metrics to find keywords that your users are searching for and organize them according to SEO campaign stages. Proprietary technology to leverage Allintitle data to identify keywords with high conversion rates but low competition.

Starting Price: $27

View Software

Paraphrase Tool

Your words and thoughts matter, and we’ve designed our paraphrase tool to ensure find the best words to match your expression. Just paste or start writing your text in our input box above, and our best-in-class AI will help you to generate the best paraphrases from your original writing. Who has time for writer’s block? Our Composer can help you write 10x faster by enabling you to create paragraphs from keywords instantly for articles, cover letters, essays, and more than 500 other types of writing in 100+ Languages. This way you can focus more on your final work rather than your first draft. None of us wants to accidentally plagiarize, especially when we spend so much time getting our ideas on paper and refining them. Be sure that your text is unique and 100% free of plagiarism by using our plagiarism checker for 50+ Languages.

Starting Price: $4.99 per month

View Software

Multilings

Multilings is a neural AI based machine learning service which gives the best human like output for text translation, content writing, plagiarism and voice translation etc. Best for Marketers, Content Writers, Researchers, Students and everyone. Is content writing your profession? Use our productive tools to write compelling content which is not just good for humans to read but also for search engines. If you are researching and writing on a subject, our highly useful productive tools may help you with plagiarism, good tone and mood-based writing and so on. Write effectively on any subjects, thesis, use our neural ai and machine learning based tools to help you write fresh content based on your audience, mood and level of simplicity. If you are a non-native speaker i.e. you speak a different language but work in a different language, our set of tools going to help you a lot to do your work on the other language you want.

Starting Price: $9.99 per month

View Software

PaperTyper

Our AI essay writer was solely developed for academic writing needs. So, our AI generator knows all the nuances of proper paper writing. Both grammar and plagiarism checkers provide comprehensive and detailed reports. You have a perfect chance to learn from your mistakes and edit your papers from the ground up. With our tools, you don’t need to spend several nights researching, writing several drafts, editing and checking a final text, and then citing it. Quickly find information about your topic to create a flawless academic paper of any kind. All students will agree that these useful tools will make the writing and editing process fast and as simple. No need to bother yourself with annoying homework tasks anymore – rely on the latest technologies now.

Starting Price: Free

View Software

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

View Software

PapersOwl

PapersOwl's free online plagiarism checker is an AI-powered tool designed to help students and writers ensure the originality of their work. It supports all common file formats and offers features such as deep search, real-time checking, and data safety. The tool provides a comprehensive report with a plagiarism percentage, highlighting any matched sources and offering links to the original content for easy comparison. Users can either copy and paste their text or upload files directly into the checker. The platform emphasizes the importance of proper citation to avoid plagiarism and offers additional services like rewriting, editing, and proofreading to enhance the uniqueness of the content. PapersOwl's checker is available 24/7, ensuring that users can verify their documents' originality at any time. Our simple tool makes it convenient to check any writing task without having to spend a dime. It works quickly and highly accurately, ensuring that you get the top grade you deserve.

Starting Price: $8 per page

View Software

Getsolved.ai

GetSolved.ai is an AI-powered homework-helper platform that allows students to type in questions or upload full assignments, including files or images, and receive detailed solutions, step-by-step explanations, and contextual reasoning across a wide range of subjects (from math and science to essays and economics). The system supports end-to-end workflows; you either paste a question or drag the document, the AI processes the content, and you receive annotated solutions along with optional access to live tutors for deeper review. The platform emphasizes guided learning, not just the final answer, by breaking down each task into comprehensible segments, detecting common errors, and helping users understand the process. With support for uploaded images, scanned homework, and mixed-format questions, it’s designed to save time for students, clarify difficult concepts, and improve confidence through clear explanations and hybrid AI-human support.

Starting Price: $19.99 per month

View Software

Best Plagiarism Checker Software in the USA

Compare the Top Plagiarism Checker Software in the USA as of February 2026

What is Plagiarism Checker Software in the USA?

Semrush

Grammarly

Smodin

StudyAgent

Trinka AI

Originality.ai

PlagiarismSearch.com

ProWritingAid

QuillBot

Grammica

Copyscape

Plagly

Paraphraser.io

StudyXY

Codequiry

WRITER

Check-Plagiarism

CopyChecker

PlagiaShield

Noplag

Quetext

Copyleaks

DupliChecker.com

WriterZen

Paraphrase Tool

Multilings

PaperTyper

Detecting AI

PapersOwl

Getsolved.ai

Best Plagiarism Checker Software in the USA

Compare the Top Plagiarism Checker Software in the USA as of February 2026

What is Plagiarism Checker Software in the USA?

Semrush

Grammarly

Smodin

StudyAgent

Trinka AI

Originality.ai

PlagiarismSearch.com

ProWritingAid

QuillBot

Grammica

Copyscape

Plagly

Paraphraser.io

StudyXY

Codequiry

WRITER

Check-Plagiarism

CopyChecker

PlagiaShield

Noplag

Quetext

Copyleaks

DupliChecker.com

WriterZen

Paraphrase Tool

Multilings

PaperTyper

Detecting AI

PapersOwl

Getsolved.ai

Related Categories