AI detection hub

AI detectors score patterns in a draft. Many of them only evaluate a few languages, and they can flag human writing, especially from non-native writers. This page lists the detectors SupWriter tracks, what each one measures, and the pages we still publish. A score is not a verdict, and no tool can guarantee one.

AI detectors, how they read a draft, and whether SupWriter still publishes a page for each one
Detector	Type	How it reads a draft	Language coverage	Page
AI Detector	General	AI Detector represents the generic class of checkers that measure perplexity, burstiness, and related statistical features against LLM baselines.	as a category, offers reliable coverage almost exclusively in English, whatever individual tools advertise.	On this hub
BrandWell	Marketing	BrandWell applies proprietary ML that examines sentence structure, rhythm, and word patterns learned from its three-engine content generator.	serves English-language brand and SEO content, consistent with its US-market agency clientele.	On this hub
Copyleaks	Enterprise	Copyleaks combines AI-text classification with plagiarism matching in a single enterprise scan, flagging statistical fingerprints of LLM output at the passage level.	officially supports AI detection in 30+ languages, among the broadest coverage of any enterprise detector.	On this hub
Crossplag	Academic	Crossplag runs RoBERTa-based models. Treat accuracy figures as the vendor's claim..	lists 50+ languages for its combined AI and plagiarism checks.	On this hub
GPTZero	General	GPTZero scores perplexity, burstiness, and five other proprietary signals to produce sentence-level AI probability highlights.	officially supports five languages, with English as its primary benchmark target.	On this hub
Grammarly	Writing Tool	Grammarly checks whether prose follows word-sequence patterns typical of large language models, layered on top of its grammar-analysis engine.	is English-only for AI detection, despite Grammarly's broader multilingual editing ambitions.	Read the page
Grubby AI	General	Grubby AI runs transformation passes intended to strip machine-typical phrasing, with effectiveness that shifts from one detector to the next.	documents little about language coverage and appears tuned for English input.	On this hub
Humbot	Writing Tool	Humbot bundles a basic AI checker alongside its thesaurus-style rewriting modes, flagging text that retains obvious machine phrasing.	markets 50+ language support across its toolset, though this describes rewriting reach more than validated detection coverage.	On this hub
Isgen.ai	General	Isgen.ai classifies text against pattern signatures of ChatGPT, Claude, and other mainstream models.	markets broad model coverage but keeps its language support vague beyond English.	On this hub
JustDone	Marketing	JustDone offers detection as one tool in a writing suite, using generalized classification rather than a purpose-built forensic model.	is oriented toward English marketing copy, with templates rather than languages as its axis of variety.	On this hub
Merlin	Writing Tool	Merlin includes an AI detector among its browser-extension tools, wrapping general-purpose classification around whatever text you highlight.	rides on multilingual foundation models like GPT-4 and Claude but documents no dedicated per-language detection support.	On this hub
Monica	Writing Tool	Monica is primarily a generation assistant, and text it produces with GPT-5 or Claude 4.5 carries exactly the patterns dedicated detectors are trained to catch.	emphasizes bilingual translation features rather than any formal AI-detection language list.	On this hub
NoteGPT	Writing Tool	NoteGPT is a summarization assistant rather than a forensic detector — the risk is that its AI-generated study notes are themselves detectable when submitted.	transcribes and summarizes in 50+ languages.	On this hub
Originality.ai	Marketing	Originality.ai runs multiple trained models (Lite, Turbo, and Academic) over word-pattern and paraphrase signals to catch even reworded AI output.	focuses on English content, with multilingual detection offered only as a secondary, less-documented capability.	On this hub
Phrasly	General	Phrasly compares submissions against proprietary models trained on more than 1 million human-written articles (Phrasly site, as of Sept 2026) instead of GPT-family baselines.	centers on English, with its human-article training corpus overwhelmingly drawn from English web writing.	On this hub
QuillBot	Writing Tool	QuillBot leans on the same language models behind its paraphraser to estimate how AI-like a passage reads.	supports AI detection in six languages: English, French, Spanish, German, Dutch, and Portuguese.	Read the page
Rewritify	Writing Tool	Rewritify performs surface-level rewriting checks typical of free humanizer tools, without a documented detection methodology.	publishes no formal language list and behaves as an English-first free tool.	On this hub
RyRob	Marketing	RyRob is a blogging resource hub whose AI-content tooling checks drafts for the generic phrasing patterns readers and search engines penalize.	is an English-only platform serving primarily US blogging audiences.	On this hub
Sapling AI Detector	Enterprise	Sapling AI Detector screens customer-facing messages in real time, scoring how strongly replies resemble LLM-drafted support boilerplate.	concentrates on English customer-support and sales communication, where its enterprise clients operate.	On this hub
SciSpace	Academic	SciSpace focuses on parsing and explaining scientific papers, so the detection risk lies in journals scanning the summaries and paraphrases it helps produce.	works with research literature in multiple languages, though scientific English dominates its corpus.	On this hub
Scribbr	Academic	Scribbr uses proprietary classification software, backed by Turnitin-powered plagiarism matching, to gauge whether academic prose reads as ChatGPT-style output.	runs AI detection in English, Spanish, German, French, and Dutch, while its plagiarism checker stretches to 20 languages.	On this hub
Smodin	Writing Tool	Smodin pairs multilingual pattern analysis with sentence-level scoring.	advertises support for 50+ languages across its writing suite, unusual breadth for a budget tool.	On this hub
Stealthwriter	Writing Tool	Stealthwriter ships a built-in checker that mirrors the patterns its Ghost Mini and Ghost Pro rewriting models target.	handles only English, Spanish, and French — one of the narrowest language ranges in this space.	Read the page
Surfer SEO	Marketing	Surfer SEO estimates AI likelihood as a sidecar to its SEO content editor.	optimizes content in multiple European languages for SEO, but its AI detector is calibrated for English publishing workflows.	On this hub
SurgeGraph	Marketing	SurgeGraph screens generated drafts for machine-like phrasing as part of its content-production pipeline rather than as a standalone forensic tool.	targets English-language SEO content, with no published multilingual detection capability.	On this hub
Turnitin	Academic	Turnitin analyzes sentence structure, perplexity, and linguistic features across a submission and assigns a document-level AI percentage tuned for conservative flagging.	runs AI detection in English plus a small set of additional languages such as Spanish and Japanese, a fraction of its plagiarism-check coverage.	On this hub
Undetectable AI	General	Undetectable AI aggregates verdicts from several third-party detectors into a single composite score rather than running one proprietary model.	claims essay support in 20 languages and translation into 36, though those numbers describe its writing tools more than its detection.	On this hub
Walter Writes AI	Writing Tool	Walter Writes AI rewrites AI text with a free-tier humanization pass.	operates as an English-first free tool with a limited, undocumented language range.	Read the page
Winston AI	Enterprise	Winston AI feeds text through a classifier trained on GPT-4- and Claude-era output, returning a human score alongside plagiarism and readability metrics.	officially covers six languages, a narrower footprint than enterprise rivals like Copyleaks.	On this hub
Writer	Enterprise	Writer checks whether text follows word patterns typical of large language models, a lightweight method the company retired in December 2025.	was built for English enterprise content, matching the English-first focus of its Palmyra model lineup.	On this hub
YouScan	Marketing	YouScan analyzes social-media content at scale for brand monitoring, surfacing inauthentic or machine-generated posts as part of its listening pipeline.	monitors social conversations in multiple languages as social listening demands, though AI-content analysis is not benchmarked per language.	On this hub
ZeroGPT	General	ZeroGPT applies its DeepAnalyse™ classifier to highlight suspect sentences in yellow, orange, or red based on how machine-like their patterns look.	claims to work in all languages without publishing per-language accuracy data.	On this hub

SafeAssign has its own page: SafeAssign.

How we talk about detector scores

Scores come from SupWriter's own AI detector, a pre-check based on one scoring model, not the detector your school or client uses. Results vary between runs, and no tool can guarantee a result. Read how we test AI detectors.

SupWriter is an AI humanizer: it rewrites AI-assisted drafts so they read more naturally in the writer's own voice, including for non-native writers who want to check a draft before they submit. Checking a draft and chasing a detector score are different jobs.

SupWriter's AI detector and the AI humanizer are the tools behind that workflow.