{ "site": "Paraphrase Pass", "url": "https://paraphrasepass.com/tools/", "generated": "2026-10-31", "description": "The tools people arrive here looking for, one click each. Grouped by what you are trying to do. Direct links to the vendor, with the directory entry beside each one for the limits and the date it was last checked.", "groups": [ { "id": "check", "title": "Check text for AI", "lede": "Classifier detectors. Free to try, instant, and fallible: run two, expect disagreement, and treat a score as a reason to ask questions rather than as proof.", "items": [ { "id": "pangram", "name": "Pangram", "org": "Pangram Labs", "url": "https://www.pangram.com/", "what": "Free checker with limits", "cost": "Free checker with limits. Paid plans and an API.", "note": "A trained classifier that explicitly targets humanized text as well as raw model output. Pangram publishes its own comparisons and reports detection above 90 percent on high-quality humanized content.", "caveat": "Those figures are vendor-reported. No independent study of the same claim had been published when this entry was checked.", "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/pangram/" }, { "id": "gptzero", "name": "GPTZero", "org": "GPTZero", "url": "https://gptzero.me/", "what": "Free checker", "cost": "Free checker. Paid plans for volume and reports.", "note": "Education-focused detector with per-sentence highlighting, document reports and a writing-replay feature for Google Docs that shows how a draft was typed.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/gptzero/" }, { "id": "scribbr-detector", "name": "Scribbr AI Detector", "org": "Scribbr", "url": "https://www.scribbr.com/ai-detector/", "what": "Free, no account", "cost": "Free, no account needed.", "note": "A free checker from the academic editing service, with a premium tier for longer documents.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/scribbr-detector/" }, { "id": "copyleaks", "name": "Copyleaks AI Detector", "org": "Copyleaks", "url": "https://copyleaks.com/", "what": "Limited free use", "cost": "Limited free use. Paid plans, LMS integrations and an API.", "note": "Enterprise and education detector that also covers source-code and plagiarism checks. Claims low false-positive rates in its own testing.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/copyleaks/" }, { "id": "originality", "name": "Originality.ai", "org": "Originality.ai", "url": "https://originality.ai/", "what": "Paid credits", "cost": "Paid credits or subscription.", "note": "Built for publishers, agencies and SEO teams. Combines AI detection with plagiarism, readability and fact-check tools, and publishes its own benchmark studies.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/originality/" }, { "id": "zerogpt", "name": "ZeroGPT", "org": "ZeroGPT", "url": "https://www.zerogpt.com/", "what": "Free", "cost": "Free. Paid plans for volume.", "note": "One of the most-visited free checkers.", "caveat": "Independent tests often report inconsistent scores on the same text, so treat it as a rough signal.", "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/zerogpt/" }, { "id": "sapling", "name": "Sapling AI Detector", "org": "Sapling", "url": "https://sapling.ai/ai-content-detector", "what": "Free checker", "cost": "Free checker. Paid API.", "note": "Highlights sentences by estimated likelihood and ships as a browser extension.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/sapling/" }, { "id": "writer-detector", "name": "Writer AI Content Detector", "org": "Writer", "url": "https://writer.com/ai-content-detector/", "what": "Free for short passages", "cost": "Free for short passages.", "note": "A quick check from the enterprise writing platform, limited to short samples.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/writer-detector/" }, { "id": "binoculars", "name": "Binoculars", "org": "Hans et al., open research code", "url": "https://arxiv.org/abs/2401.12070", "what": "Open source, run it yourself", "cost": "Free, open source.", "note": "A zero-shot method that compares how two related models score the same text, with no detector training data. Useful as an independent baseline when you do not trust a vendor's number.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/binoculars/" } ] }, { "id": "rewrite", "title": "Paraphrase or rewrite text", "lede": "General rewriting tools for clarity, tone and length. Listed for what they do, not for passing anything.", "items": [ { "id": "quillbot", "name": "QuillBot", "org": "QuillBot (Learneo)", "url": "https://quillbot.com/", "what": "Free to 125 words", "cost": "Free up to 125 words per paraphrase. Premium subscription.", "note": "The most used paraphraser. Modes for fluency, formality, simplification, expansion and shortening, plus a grammar checker, summarizer and citation generator.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/quillbot/" }, { "id": "grammarly", "name": "Grammarly", "org": "Grammarly", "url": "https://www.grammarly.com/", "what": "Free tier", "cost": "Free tier. Pro subscription.", "note": "Grammar and clarity first, with a paraphrase feature. The right choice when you want fewer changes rather than a full rewrite.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/grammarly/" }, { "id": "wordtune", "name": "Wordtune", "org": "AI21 Labs", "url": "https://www.wordtune.com/", "what": "10 free rewrites a day", "cost": "Free for 10 rewrites a day. Paid plans.", "note": "Sentence-level rewrites with casual and formal options, as a web app and browser extension.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/wordtune/" }, { "id": "deepl-write", "name": "DeepL Write", "org": "DeepL", "url": "https://www.deepl.com/write", "what": "Free with limits", "cost": "Free with limits. DeepL Pro.", "note": "Style and tone rewriting from the translation company. Strong on English and German, with alternatives offered per sentence.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/deepl-write/" }, { "id": "languagetool-paraphraser", "name": "LanguageTool Paraphraser", "org": "LanguageTool", "url": "https://languagetool.org/paraphrasing-tool", "what": "Free with limits", "cost": "Free with limits. Premium.", "note": "Paraphrasing on top of an open-core grammar checker, available in many languages.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/languagetool-paraphraser/" }, { "id": "scribbr-paraphraser", "name": "Scribbr Paraphrasing Tool", "org": "Scribbr", "url": "https://www.scribbr.com/paraphrasing-tool/", "what": "Free", "cost": "Free.", "note": "A student-oriented paraphraser that pairs with Scribbr's citation and plagiarism tools.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/scribbr-paraphraser/" }, { "id": "hemingway", "name": "Hemingway Editor", "org": "Hemingway", "url": "https://hemingwayapp.com/", "what": "Free in the browser", "cost": "Free in the browser. Paid desktop app with AI rewrites.", "note": "A readability editor rather than a paraphraser. It shows what to cut and which sentences are hard to read, which is often what a draft actually needs.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/paraphrasers/hemingway/" } ] }, { "id": "verify", "title": "Verify a watermark or provenance", "lede": "Provider marks and content credentials. Text watermark detection is by application; the Content Credentials tool is open to anyone with a file.", "items": [ { "id": "content-credentials-verify", "name": "Content Credentials verify tool", "org": "Content Authenticity Initiative", "url": "https://contentcredentials.org/", "what": "Free, any file", "cost": "Free.", "note": "Drop in an image, video or audio file and read any attached C2PA manifest, including the signing organisation and recorded edits.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/watermarks/content-credentials-verify/" }, { "id": "synthid", "name": "SynthID for text", "org": "Google DeepMind", "url": "https://deepmind.google/models/synthid/", "what": "Google portal and library", "cost": "Built into Gemini. Detector portal for images, audio and video; text detection through the open-source library.", "note": "A statistical watermark that tilts word choice while the model writes. Applied to text in the Gemini app since May 2024. The method was published in Nature in October 2024 and released as an open-source library with Hugging Face, so anyone can apply and detect a mark with their own key.", "caveat": "Detection needs the key that made the mark, so a Gemini mark can only be checked by Google or by a party Google authorises.", "verified": "2026-10-31", "page": "https://paraphrasepass.com/watermarks/synthid/" }, { "id": "synthid-text-library", "name": "synthid-text library", "org": "Google DeepMind on GitHub", "url": "https://github.com/google-deepmind/synthid-text", "what": "Open source", "cost": "Free, Apache 2.0 licence.", "note": "Reference implementation of the text watermark for Hugging Face Transformers. Useful for anyone who wants to watermark their own model's output, or to study how the signal behaves after editing.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/watermarks/synthid-text-library/" }, { "id": "claude-watermark", "name": "Claude text watermark", "org": "Anthropic", "url": "https://www.anthropic.com/news/claude-text-watermark", "what": "Detection by application", "cost": "Applied automatically. Detection API in private preview for eligible organisations.", "note": "Announced August 14, 2026 and updated September 1, 2026. A version of SynthID-Text applied globally to future Claude models, with models released before August 2, 2026 to follow over the coming months. Detection uses Anthropic's key and answers only whether Claude likely wrote part of a passage. Access is open by application to regulators, law enforcement, media, fact-checkers, researchers, educators, EU civil society groups and enterprises with EU compliance duties.", "caveat": "Anthropic's own words: light editing probably will not remove the mark completely; a complete rewrite where every word is replaced will.", "verified": "2026-10-31", "page": "https://paraphrasepass.com/watermarks/claude-watermark/" }, { "id": "textgrain", "name": "textGrain", "org": "OpenAI", "url": "https://openai.com/index/eu-text-provenance/", "what": "Detection by application", "cost": "Opt-in for API customers worldwide, off by default. Rolling out to ChatGPT and Codex output in the EU only. Detector by application.", "note": "Announced October 5, 2026. OpenAI reports that at a 1 percent false positive rate its detector found the mark in about 95 percent of 400-token passages and about 80 percent of 200-token passages, with lower rates on constrained text such as mathematics. Detector access is limited to approved researchers and expert organisations. OpenAI says it plans to open-source the technique.", "caveat": "In OpenAI's own evaluation, replacing 10 percent of words with synonyms cut detection on 400-token passages from about 92 to 66 percent, and replacing 25 percent cut it to 17 percent.", "verified": "2026-10-31", "page": "https://paraphrasepass.com/watermarks/textgrain/" } ] }, { "id": "turnitin", "title": "Turnitin, for students and teachers", "lede": "The detector most people are asking about when they search this subject, and the vendor's own explanation of what the percentage means.", "items": [ { "id": "turnitin", "name": "Turnitin AI writing detection", "org": "Turnitin", "url": "https://www.turnitin.com/solutions/topics/ai-writing/", "what": "Institutional licence", "cost": "Institutional licence, sold as an add-on to Turnitin Originality and iThenticate.", "note": "The detector most students meet. It reports a percentage of a submission that it judges likely AI-written. AI bypasser detection, announced August 27, 2025, flags text that humanizer tools may have rewritten and counts it toward the AI-generated total. Bypasser detection is trained and tested for English only.", "caveat": "Several universities have switched the AI indicator off over false-positive concerns. Turnitin's own guide says a score should start a conversation, not decide an outcome.", "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/turnitin/" }, { "id": "turnitin-model-guide", "name": "Turnitin detection model guide", "org": "Turnitin", "url": "https://guides.turnitin.com/hc/en-us/articles/28294949544717-AI-writing-detection-model", "what": "Free, read this first", "cost": "Free documentation.", "note": "Turnitin's own description of how the model is trained, what the percentage means, which languages are covered and where it says the score should not be used alone.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/detectors/turnitin-model-guide/" }, { "id": "turnitin-release-notes", "name": "Turnitin release notes", "org": "Turnitin", "url": "https://guides.turnitin.com/hc/en-us/articles/27251688507533-Turnitin-release-notes", "what": "What changed and when", "cost": "Free.", "note": "Where detector model changes and report changes are logged, often before any press release.", "caveat": null, "verified": "2026-10-31", "page": null } ] }, { "id": "evidence", "title": "Compare detectors and read the research", "lede": "The neutral scoreboard and the papers that explain why scores disagree.", "items": [ { "id": "raid", "name": "RAID benchmark", "org": "Dugan et al., 2024", "url": "https://raid-bench.xyz/", "what": "Leaderboard, open data", "cost": "Free, open data and leaderboard.", "note": "A shared benchmark of more than six million generations across models, domains, decoding settings and adversarial attacks, including paraphrasing. The public leaderboard is the closest thing to a neutral scoreboard for detectors. Paper at arXiv 2405.07940.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/research/raid/" }, { "id": "liang-2023", "name": "GPT detectors are biased against non-native English writers", "org": "Liang et al., 2023, published in Patterns", "url": "https://arxiv.org/abs/2304.02819", "what": "The false positive study", "cost": "Open access.", "note": "Seven detectors flagged essays by non-native English speakers at an average false positive rate of 61.3 percent. More than 91 percent of the essays were flagged by at least one detector. The study behind most false-accusation coverage.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/research/liang-2023/" }, { "id": "sadasivan-2023", "name": "Can AI-Generated Text be Reliably Detected?", "org": "Sadasivan et al., 2023", "url": "https://arxiv.org/abs/2303.11156", "what": "Why detection is hard", "cost": "Open access.", "note": "Argues that recursive paraphrasing defeats both classifiers and watermarks, and that detection gets harder as models get closer to human text.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/research/sadasivan-2023/" }, { "id": "nist-100-4", "name": "Reducing Risks Posed by Synthetic Content", "org": "NIST AI 100-4, 2024", "url": "https://www.nist.gov/publications/reducing-risks-posed-synthetic-content-overview-technical-approaches-digital-content", "what": "NIST overview", "cost": "Free.", "note": "The US standards body's overview of provenance, watermarking and detection techniques, with their known limits. A good neutral primer.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/research/nist-100-4/" } ] }, { "id": "law", "title": "Read the rules", "lede": "The two laws that now require marks, and the platform policies that restrict removing them.", "items": [ { "id": "eu-ai-act-50", "name": "EU AI Act, Article 50", "org": "European Union", "url": "https://artificialintelligenceact.eu/article/50/", "what": "EU, applies from Aug 2, 2026", "cost": "Free text.", "note": "Transparency obligations. Providers of generative systems must mark output in a machine-readable way; deployers must disclose deepfakes and AI-written text published on matters of public interest. Applies from August 2, 2026, with a transition period for systems already on the market.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/policy/eu-ai-act-50/" }, { "id": "california-ai-transparency", "name": "California AI Transparency Act (SB 942, amended by AB 853)", "org": "State of California", "url": "https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB853", "what": "California, platforms from 2027", "cost": "Free text.", "note": "AB 853 was signed October 13, 2025. Covered providers owe disclosures and detection tools from August 2, 2026. Large online platforms and generative AI hosting platforms are covered from January 1, 2027, including a ban on knowingly stripping provenance data. Capture device makers follow on January 1, 2028.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/policy/california-ai-transparency/" }, { "id": "anthropic-aup", "name": "Anthropic Usage Policy", "org": "Anthropic", "url": "https://www.anthropic.com/legal/aup", "what": "Anthropic usage policy", "cost": "Free text.", "note": "The rules for anyone building on Claude, including the deceptive-use section that covers passing generated text off as human work. Read it before building a rewriting tool on the API.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/policy/anthropic-aup/" }, { "id": "openai-usage-policies", "name": "OpenAI Usage Policies", "org": "OpenAI", "url": "https://openai.com/policies/usage-policies/", "what": "OpenAI usage policies", "cost": "Free text.", "note": "The equivalent rules for OpenAI models, with the same restrictions on deception and academic dishonesty.", "caveat": null, "verified": "2026-10-31", "page": "https://paraphrasepass.com/policy/openai-usage-policies/" } ] } ], "humanizers": "Humanizers, the rewriters sold on passing detectors, are listed in the paraphrasers section with their caveats and are not quick-linked here. Nothing on this site tests or ranks evasion." }