{ "title": "Turnitin Alternatives 2027: 15 Paid, Free & Open-Source", "url": "https://zekaiwork.com/alternatives/turnitin/", "summary": "The best Turnitin alternatives in 2027 are Copyleaks (best overall, $13.99/mo billed yearly), Quetext (best free plan) and SlopTotal (best open source, MIT). Turnitin: Sold through sales contact; no public price on turnitin.com. Zekai checked these prices on vendor pages on 13 Nov 2026; 12 more are compared below, including 4 with a free plan and 6 open source.", "tool": { "name": "Turnitin", "starting_price": "Sold through sales contact; no public price on turnitin.com.", "free_plan": "No", "price_checked": "2026-11-13", "pricing_url": "https://www.turnitin.com/products/feedback-studio" }, "task": "AI content and plagiarism detector", "prices_checked": "2026-11-13", "date_modified": "2026-11-13", "alternatives": [ { "name": "Copyleaks", "type": "Paid", "starting_price": "$13.99/mo billed yearly", "free_plan_limit": "No free plan", "best_for": "Plagiarism and AI checks for individuals and schools", "difference": "Publishes self-serve prices by credit: Personal gives 100 credits a month (up to 25,000 words) and Pro $99.99 monthly for 1,000 credits; Education and Enterprise are by quote.", "price_checked": "2026-11-11", "pricing_url": "https://copyleaks.com/pricing", "website": "https://copyleaks.com", "zekai_score": 6.6, "zekai_review": "https://zekaiwork.com/ai-tools/copyleaks/" }, { "name": "GPTZero", "type": "Paid", "starting_price": "Not checked", "free_plan_limit": "No free plan", "best_for": "Sentence-level AI highlighting for teachers", "difference": "Highlights flagged sentences and lists the models it checks for; Writing Replay plays back how a document was typed, including paste activity, and a free Chrome extension covers Google Docs.", "price_checked": "2026-11-11", "pricing_url": "https://gptzero.me/pricing", "website": "https://gptzero.me", "zekai_score": 6.3, "zekai_review": "https://zekaiwork.com/ai-tools/gptzero/" }, { "name": "Originality.ai", "type": "Free plan + paid", "starting_price": "$12.95/mo billed yearly", "free_plan_limit": "10K words (100 credits), one-time", "best_for": "Publishers checking AI text and plagiarism", "difference": "Charges one credit per 100 words, so an AI plus plagiarism scan uses two; Pro includes 200K words a month and 30-day scan history, with the API on Enterprise.", "price_checked": "2026-11-11", "pricing_url": "https://originality.ai/pricing", "website": "https://originality.ai", "zekai_score": 7.7, "zekai_review": "https://zekaiwork.com/ai-tools/originality-ai/" }, { "name": "Winston AI", "type": "Free plan + paid", "starting_price": "$10/mo billed yearly", "free_plan_limit": "2,000 credits over a 14-day trial", "best_for": "AI detection with certification for websites", "difference": "Essential gives 100,000 credits a month and up to 200,000 characters per scan; its free tier is a 14-day trial, and a HUMN-1 certification is offered for website content.", "price_checked": "2026-11-11", "pricing_url": "https://gowinston.ai/pricing/", "website": "https://gowinston.ai", "zekai_score": 7.7, "zekai_review": "https://zekaiwork.com/ai-tools/winston-ai/" }, { "name": "Quetext", "type": "Free plan + paid", "starting_price": "$14.99/mo", "free_plan_limit": "1,000 words each for plagiarism and AI checks", "best_for": "Students checking essays before submission", "difference": "Essential bundles plagiarism and AI detection at 100K words a month each with an AI humanizer and AITutorMe; Professional at $29.98 doubles to 200K words and 100 bulk-upload files.", "price_checked": "2026-11-11", "pricing_url": "https://www.quetext.com/pricing", "website": "https://www.quetext.com", "zekai_score": 7.6, "zekai_review": "https://zekaiwork.com/ai-tools/quetext/" }, { "name": "Scribbr", "type": "Free", "starting_price": "Free plan; paid price not published", "free_plan_limit": "Unlimited free AI checks (word cap not stated)", "best_for": "Students checking essays before submission", "difference": "The AI detector page advertises unlimited free AI checks plus a Premium AI Detector tier with GPT-4 detection; Scribbr is built for students, not for institution-wide deployment.", "price_checked": "2026-11-11", "pricing_url": "https://www.scribbr.com/ai-detector/", "website": "https://www.scribbr.com", "zekai_score": 7.5, "zekai_review": "https://zekaiwork.com/ai-tools/scribbr/" }, { "name": "PlagiarismCheck.org", "type": "Paid", "starting_price": "Not checked", "free_plan_limit": "No free plan", "best_for": "Schools wanting quote-based plagiarism checks", "difference": "Education plans are sold by quote only; Advanced supports an English, German, French, Portuguese or Spanish interface while Pro supports any language, and there is no public price list.", "price_checked": "2026-11-11", "pricing_url": "https://plagiarismcheck.org/pricing/", "website": "https://plagiarismcheck.org", "zekai_score": 5.5, "zekai_review": "https://zekaiwork.com/ai-tools/plagiarismcheckorg/" }, { "name": "Compilatio", "type": "Free", "starting_price": "Free plan; paid price not published", "free_plan_limit": "First student analysis free, top 3 sources shown", "best_for": "European schools and universities", "difference": "Magister serves teachers and Studium lets students self-check; analysis covers more than 40 languages, and plagiarism and AI results appear in one report.", "price_checked": "2026-11-11", "pricing_url": "https://compilatio.net", "website": "https://compilatio.net", "zekai_score": 7.8, "zekai_review": "https://zekaiwork.com/ai-tools/compilatio/" }, { "name": "SlopTotal", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "MIT", "best_for": "Self-hosted multi-engine AI text detector", "difference": "Runs 23 detection engines, including Binoculars and Fast-DetectGPT, on your own CPU and returns one calibrated score with per-engine votes, file and URL scanning, and a JSON API.", "price_checked": "2026-11-13", "website": "https://sloptotal.com", "repository": "https://github.com/pablocaeg/sloptotal", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/sloptotal/", "commercial_use": "Yes (MIT).", "runs_on": "Runs on CPU; loaded models need about 8.3 GB of RAM; GPU optional.", "setup": "moderate: One docker run command; models download on first start.", "github_stars": 114, "stars_checked": "2026-11-13", "last_commit": "2026-11-03", "last_release": "2026-11-03", "zekai_score": 6.9, "zekai_review": "https://zekaiwork.com/free-open-source/sloptotal/" }, { "name": "Binoculars", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "BSD-3-Clause", "best_for": "Research-grade zero-shot AI text detection", "difference": "A zero-shot AI-text detector from an ICML 2024 paper that needs no training data; it only scores AI likelihood and does no plagiarism matching, and the repo says academic use with human supervision.", "price_checked": "2026-11-13", "website": "https://github.com/ahans30/Binoculars", "repository": "https://github.com/ahans30/Binoculars", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/binoculars/", "commercial_use": "Yes for the code (BSD-3-Clause); check the licence of the Falcon models you download.", "runs_on": "Python 3.9; two 7B models, so a GPU or large-memory machine.", "setup": "hard: Clone the repo, pip install, then download two 7B models.", "github_stars": 435, "stars_checked": "2026-11-13", "last_commit": "2024-05-14", "zekai_score": 3.5, "zekai_review": "https://zekaiwork.com/free-open-source/binoculars/" }, { "name": "Dolos", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "MIT", "best_for": "Source-code plagiarism checks in programming courses", "difference": "Detects source code plagiarism between submissions with similarity scores and a side-by-side compare view, but it checks code only and does not detect AI-written prose.", "price_checked": "2026-11-13", "website": "https://dolos.ugent.be", "repository": "https://github.com/dodona-edu/dolos", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/dolos/", "commercial_use": "Yes (MIT).", "runs_on": "Node.js 22 or newer, or Docker; a free hosted web app also exists.", "setup": "easy: npm install -g @dodona/dolos gives a CLI; web hosting needs Docker.", "github_stars": 357, "stars_checked": "2026-11-13", "last_commit": "2026-11-12", "last_release": "2026-10-19", "zekai_score": 7.1, "zekai_review": "https://zekaiwork.com/free-open-source/dolos/" }, { "name": "Fast-DetectGPT", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "MIT", "best_for": "Zero-shot detection from an ICLR 2024 paper", "difference": "ICLR 2024 zero-shot method using conditional probability curvature; the README reports 0.9887 AUROC on five-model generations and ships a local script, with no dashboard or upload.", "price_checked": "2026-11-13", "website": "https://fastdetect.net/", "repository": "https://github.com/baoguangsheng/fast-detect-gpt", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/fast-detect-gpt/", "commercial_use": "Yes (MIT).", "runs_on": "Authors ran it on an 80 GB A100; the local demo defaults to gpt-neo-2.7B.", "setup": "hard: Python 3.8 and PyTorch 1.10 environment plus model downloads.", "github_stars": 440, "stars_checked": "2026-11-13", "last_commit": "2026-02-07", "zekai_score": 5.1, "zekai_review": "https://zekaiwork.com/free-open-source/fast-detect-gpt/" }, { "name": "Open Detector", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "MIT", "best_for": "Academic-paper AI detection with a small model", "difference": "BERT-base classifier trained for academic papers; the README claims 99.57% accuracy on its own dataset and says it is stylometric only. It is a model and script, not a web app.", "price_checked": "2026-11-13", "website": "https://github.com/Imalwayshere/Open-Detector", "repository": "https://github.com/Imalwayshere/Open-Detector", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/open-detector/", "commercial_use": "Yes (MIT); the Hugging Face model card also states MIT.", "runs_on": "Python with PyTorch and Transformers; BERT-base model, 512-token input.", "setup": "moderate: pip install transformers torch, then a short Python script.", "github_stars": 254, "stars_checked": "2026-11-13", "last_commit": "2026-11-12", "zekai_score": 6.4, "zekai_review": "https://zekaiwork.com/free-open-source/open-detector/" }, { "name": "SynthID Text", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "Apache-2.0", "best_for": "Watermark detection for text you generate", "difference": "Google DeepMind reference code that detects only text carrying its SynthID watermark; the frequentist detector gives a binomial p-value for a key, so it cannot flag unwatermarked ChatGPT or Claude output.", "price_checked": "2026-11-13", "website": "https://github.com/google-deepmind/synthid-text", "repository": "https://github.com/google-deepmind/synthid-text", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/synthid-text/", "commercial_use": "Yes (Apache-2.0), but the repo calls itself a reference implementation, not for production.", "runs_on": "Any GPU such as a T4 for Gemma 3 270M; GPT-2 runs on CPU.", "setup": "moderate: Python virtual environment and a Jupyter notebook from the repo.", "github_stars": 1300, "stars_checked": "2026-11-13", "last_commit": "2026-10-26", "zekai_score": 6.3, "zekai_review": "https://zekaiwork.com/free-open-source/synthid-text/" }, { "name": "JPlag", "type": "Open source", "starting_price": "Free (self-hosted)", "free_plan_limit": "No limit (self-hosted)", "licence": "GPL-3.0", "best_for": "Source-code plagiarism checks across many languages", "difference": "Finds pairwise similarities among a set of programs and shows them in a report viewer; it compares source code in many languages and does not read essays or detect AI-written prose.", "price_checked": "2026-11-13", "website": "https://github.com/jplag/JPlag", "repository": "https://github.com/jplag/JPlag", "zekai_open_source_page": "https://zekaiwork.com/free-open-source/jplag/", "commercial_use": "Yes; GPL-3.0 means sharing source if you distribute changes.", "runs_on": "Java SE 25; runs locally, and no code or results are uploaded.", "setup": "moderate: Download a release jar and run it on Java 25.", "github_stars": 2000, "stars_checked": "2026-11-13", "last_commit": "2026-10-05", "last_release": "2025-12-11", "zekai_score": 7.3, "zekai_review": "https://zekaiwork.com/free-open-source/jplag/" } ], "faq": [ { "q": "What is the best alternative to Turnitin in 2027?", "a": "Copyleaks is the best overall Turnitin alternative on this page ($13.99/mo billed yearly). For no cost, Quetext has a free plan (1,000 words each for plagiarism and AI checks). To self-host, SlopTotal is open source (MIT)." }, { "q": "Is there a free version of Turnitin?", "a": "No. Turnitin has no free plan; paid plans start at Sold through sales contact; no public price on turnitin.com., checked on 13 Nov 2026." }, { "q": "Is there a 100% free alternative to Turnitin?", "a": "Yes. SlopTotal, Binoculars, Dolos, Fast-DetectGPT, Open Detector, SynthID Text, JPlag are open source and free to self-host. Originality.ai, Winston AI, Quetext, Scribbr, Compilatio have a free plan with limits, shown in the table." }, { "q": "How much do Turnitin alternatives cost for a team of 5?", "a": "If each of 5 people buys the entry paid plan, at the prices Zekai checked on 13 Nov 2026, the monthly cost is Winston AI $50/mo, Originality.ai $64.75/mo, Copyleaks $69.95/mo. Team and business plans can cost more per seat. The Zekai Cost Finder on this page recalculates for any team size." }, { "q": "Which is better, Copyleaks or Turnitin?", "a": "Publishes self-serve prices by credit: Personal gives 100 credits a month (up to 25,000 words) and Pro $99.99 monthly for 1,000 credits; Education and Enterprise are by quote. Choose Copyleaks if you want to buy plagiarism and AI checks yourself by monthly credits instead of negotiating an institutional contract. Stay with Turnitin if your institution already runs submissions through its LMS and needs the Similarity Report workflow educators know." }, { "q": "Why are people leaving Turnitin?", "a": "The documented reasons are: Turnitin lists no public pricing: the Feedback Studio page sends buyers to 'Speak to an expert', 'Schedule a call' or 'Contact Sales' (11 Nov 2026); Turnitin's AI writing detection is sold as the Originality add-on and, per its product page, is English only (11 Nov 2026). Each is sourced in the section above." }, { "q": "Turnitin vs GPTZero: what is the difference?", "a": "Turnitin pairs a Similarity Report with an AI writing add-on sold to institutions. GPTZero focuses on AI detection with sentence highlighting and Writing Replay, and also has plagiarism checking." } ], "publisher": "Zekai (zekaiwork.com) — independently reviewed; prices read on vendor pages on the dates shown.", "licence": "Free to quote with a link to https://zekaiwork.com/alternatives/turnitin/. Bulk copying or republishing the dataset is not permitted." }