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AI detection & plagiarism checks

Compare AI detectors and plagiarism checkers critically.

Current tools, access conditions and limitations in one place—with daily link checks and no detector score treated as proof.

NoteThis page provides educational orientation, not legal assessment. Current rules of the school, university or examination body are decisive.

Distinguish plagiarism, AI use and independent work

Plagiarism checks typically search for similarity with existing sources. AI detection attempts to classify statistical language patterns. These are different questions, and both approaches have limitations.

The rules of the school or university are decisive: What assistance is permitted, what must be disclosed and which work must be independent?

Why a detector score is not enough

  • short or heavily edited texts are difficult to classify
  • simple language may be incorrectly treated as suspicious
  • different detectors can return different results for the same text
  • a score does not identify the specific rule that may have been breached
A technical indication can prompt a conversation. It should not decide authorship or misconduct on its own.

A clean working process with AI

  1. Check applicable rules before beginning.
  2. Document the original question and outline.
  3. Read primary sources and cite them correctly.
  4. Record permitted AI assistance and tools.
  5. Verify every claim, number and reference.
  6. Be able to explain and defend the final work orally.

When uncertain, ask the teacher or examination office before submission.

Currently checked tools

Compare AI detectors, plagiarism checkers and writing-process evidence.

The directory includes freely accessible, account-based, paid and institutional services. Provider accuracy claims are not presented as independent proof.

Use several signals, not one verdict.Detector scores, similarity reports, drafts, sources, version history and an academic conversation answer different questions. No single display proves who wrote a text.
Freshness check

Links and access information are checked regularly.

The latest run reported notices. Published entries remain filtered by the configured safety rules.

Latest automated check2026-09-04 · 12:06
Next regular run2026-09-05 · 12:00
active entries22
reachable22
temporary notices0

Changes in the latest run: No content change in the latest run.

22active tools
11AI text detectors
10plagiarism checkers
16with a free entry point
Check type
Access
Input

22 of 22 tools

ScribbrFree · no account
automatically reachable · Link checked: 2026-09-04

Scribbr AI Detector

Free web detector for pasted text. The provider states unlimited checks with a per-submission word limit and no sign-up.

What is it useful for?

A quick additional comparison signal for English-language text.

AI text detector
Notes and metadata
  • Provider: Scribbr
  • Languages: en
  • Inputs: Text
  • Link checked: 2026-09-04

A percentage is not proof of authorship. Do not submit confidential or personal text without checking the current privacy terms.

Open tool at provider
QuillBotFree · no account
automatically reachable · Link checked: 2026-09-04

QuillBot AI Detector

Freely accessible text detector that estimates AI-generated and AI-refined passages as percentages.

What is it useful for?

Useful for comparing a second detector on the same text.

AI text detector
Notes and metadata
  • Provider: QuillBot
  • Languages: en, de, fr, es
  • Inputs: Text
  • Link checked: 2026-09-04

QuillBot itself notes that no detector is 100% reliable. Treat the result as an indicator only.

Open tool at provider
GPTZeroFree limited · account optional
automatically reachable · Link checked: 2026-09-04

GPTZero

Detector with document- and sentence-level analysis. Short scans are available directly; larger scans and extra features may require an account.

What is it useful for?

Useful for sentence highlights and, separately, writing-process evidence features.

AI text detectorWriting process/authorship
Notes and metadata
  • Provider: GPTZero
  • Languages: en
  • Inputs: Text, Document
  • Link checked: 2026-09-04

GPTZero also states that AI detection is not perfect. Flags should be checked against drafts, sources and the writing process.

Open tool at provider
CopyleaksFree limited · account optional
automatically reachable · Link checked: 2026-09-04

Copyleaks AI Detector

Multilingual AI text detector. A limited number of free checks may be available without an account; broader use is account-based.

What is it useful for?

An additional comparison for multilingual text and mixed human/AI passages.

AI text detector
Notes and metadata
  • Provider: Copyleaks
  • Languages: multilingual
  • Inputs: Text, Document
  • Link checked: 2026-09-04

Provider accuracy claims do not guarantee an individual result. Access limits and supported languages may change.

Open tool at provider
SaplingFree · no account
automatically reachable · Link checked: 2026-09-04

Sapling AI Content Detector

Public web demo with an overall probability and sentence analysis; an API is also offered.

What is it useful for?

Useful as a quick third comparison and for technically reproducible checks through an API.

AI text detectorAPI available
Notes and metadata
  • Provider: Sapling
  • Languages: en
  • Inputs: Text
  • Link checked: 2026-09-04

Do not treat probabilities as definitive classifications. API access and limits must be checked separately.

Open tool at provider
GrammarlyFree limited · account optional
automatically reachable · Link checked: 2026-09-04

Grammarly AI Detector

Free detector for a broad estimate; Grammarly also offers features for documenting how a text was created.

What is it useful for?

Useful when detector signals and verifiable writing-process evidence should be considered separately.

AI text detectorWriting process/authorship
Notes and metadata
  • Provider: Grammarly
  • Languages: en
  • Inputs: Text, Document
  • Link checked: 2026-09-04

Grammarly states that AI detectors are not 100% accurate and should not determine authorship on their own.

Open tool at provider
Originality.aiA few free checks · Premium available
automatically reachable · Link checked: 2026-09-04

Originality.ai AI Detector

Combines AI detection with plagiarism and other quality checks. The provider offers a few short free scans; full functionality is paid.

What is it useful for?

Useful when AI signals and similarity searching are to be compared in one commercial tool.

AI text detectorPlagiarism/similarity checkerFact checking
Notes and metadata
  • Provider: Originality.ai
  • Languages: multilingual
  • Inputs: Text, Document, Website
  • Link checked: 2026-09-04

Check current storage and privacy terms before pasting unpublished work.

Open tool at provider
Pangram LabsFree limited · account optional
automatically reachable · Link checked: 2026-09-04

Pangram AI Detector

AI text detector with web scanning, browser extensions and an API. Free credits or limited checks are offered.

What is it useful for?

Another independent comparison signal, especially for newer models and AI-edited text.

AI text detectorAPI available
Notes and metadata
  • Provider: Pangram Labs
  • Languages: multilingual
  • Inputs: Text, Document
  • Link checked: 2026-09-04

Accuracy figures are largely provider claims. A single result must not be used as proof.

Open tool at provider
Winston AI
automatically reachable · Link checked: 2026-09-04

Winston AI

Account-based trial for AI text, image and plagiarism checks; the provider lists a time- and credit-limited free plan.

What is it useful for?

Useful for document and image checks with a combined report.

AI text detectorAI image/video detectorPlagiarism/similarity checker
Notes and metadata
  • Provider: Winston AI
  • Languages: multilingual
  • Inputs: Text, Document, Image/video
  • Link checked: 2026-09-04

Free credits, duration and features may change. Results remain probabilistic.

Open tool at provider
ZeroGPTA few free checks · Premium available
automatically reachable · Link checked: 2026-09-04

ZeroGPT

Public tool with AI text detection plus image, video and plagiarism functions; paid plans raise the limits.

What is it useful for?

A broad feature comparison, not a sole basis for decisions.

AI text detectorAI image/video detectorAI image/video detectorPlagiarism/similarity checker
Notes and metadata
  • Provider: ZeroGPT
  • Languages: multilingual
  • Inputs: Text, Image/video
  • Link checked: 2026-09-04

The platform bundles many tools. Check privacy, advertising, limits and result quality separately for each mode.

Open tool at provider
TurnitinInstitution/licence only
automatically reachable · Link checked: 2026-09-04

Turnitin AI Writing Report

Institutional AI-writing analysis within Turnitin. Direct access normally comes through a school, university or organisation.

What is it useful for?

Relevant when the institution uses Turnitin and its official reports need to be interpreted.

AI text detectorinstitution
Notes and metadata
  • Provider: Turnitin
  • Languages: selected_languages
  • Inputs: Document
  • Link checked: 2026-09-04

Do not treat it as a public self-test. Observe language, minimum-length and file requirements as well as institutional rules.

Open tool at provider
Scribbr
automatically reachable · Link checked: 2026-09-04

Scribbr Plagiarism Checker

Paid similarity and plagiarism check for academic writing with a source report.

What is it useful for?

For finding possible text overlap and missing citations before submission.

Plagiarism/similarity checker
Notes and metadata
  • Provider: Scribbr
  • Languages: multilingual
  • Inputs: Document
  • Link checked: 2026-09-04

Similarity is not automatically plagiarism; matches require academic and citation-based review.

Open tool at provider
QuillBot
automatically reachable · Link checked: 2026-09-04

QuillBot Plagiarism Checker

Account-based plagiarism checking in the QuillBot suite; full use is typically a Premium feature.

What is it useful for?

An additional similarity search for drafts and citation review.

Plagiarism/similarity checker
Notes and metadata
  • Provider: QuillBot
  • Languages: multilingual
  • Inputs: Text, Document
  • Link checked: 2026-09-04

Check privacy and storage terms before uploading unpublished work.

Open tool at provider
CopyleaksFree limited · account optional
automatically reachable · Link checked: 2026-09-04

Copyleaks Plagiarism Checker

Multilingual similarity checking with web, account, education and API options. Free use may be limited.

What is it useful for?

Comparing source matches and institutional integrity checks.

Plagiarism/similarity checkerinstitutionAPI available
Notes and metadata
  • Provider: Copyleaks
  • Languages: multilingual
  • Inputs: Text, Document
  • Link checked: 2026-09-04

Check the current source corpus, free limits and storage rules before use.

Open tool at provider
Grammarly
automatically reachable · Link checked: 2026-09-04

Grammarly Plagiarism Checker

Plagiarism and source checking within Grammarly products; broader use is account-based or paid.

What is it useful for?

Useful for English writing when language review and source similarity are checked together.

Plagiarism/similarity checkerWriting process/authorship
Notes and metadata
  • Provider: Grammarly
  • Languages: en
  • Inputs: Text, Document
  • Link checked: 2026-09-04

Language correction, AI detection and plagiarism checking are different functions and must not be conflated.

Open tool at provider
TurnitinInstitution/licence only
automatically reachable · Link checked: 2026-09-04

Turnitin Similarity

Institutional similarity checking normally provided through a school, university or learning platform.

What is it useful for?

Interpreting an official Similarity Report from the user's institution.

Plagiarism/similarity checkerinstitution
Notes and metadata
  • Provider: Turnitin
  • Languages: multilingual
  • Inputs: Document
  • Link checked: 2026-09-04

A similarity score is not an automatic plagiarism decision; sources, citations and permitted overlap must be reviewed.

Open tool at provider
QuetextFree limited · account optional
automatically reachable · Link checked: 2026-09-04

Quetext

Web-based similarity checking with limited free use and paid upgrades.

What is it useful for?

An additional search for publicly discoverable text overlap.

Plagiarism/similarity checker
Notes and metadata
  • Provider: Quetext
  • Languages: en
  • Inputs: Text
  • Link checked: 2026-09-04

Coverage and limits differ from institutional systems; do not upload confidential text without review.

Open tool at provider
PlagAware
automatically reachable · Link checked: 2026-09-04

PlagAware

Plagiarism and similarity checking focused on German-language documents and web content; use is generally paid.

What is it useful for?

An alternative for German-language text and source reports.

Plagiarism/similarity checker
Notes and metadata
  • Provider: PlagAware
  • Languages: de, en
  • Inputs: Text, Document, Website
  • Link checked: 2026-09-04

Check pricing, trial options and data processing before uploading.

Open tool at provider
HiveFree limited · account optional
automatically reachable · Link checked: 2026-09-04

Hive Detect

Provider tool for detecting potentially AI-generated or manipulated images and videos, with technical APIs also available.

What is it useful for?

An additional media check for images, short videos or suspected deepfakes.

AI image/video detectorAI image/video detectorAPI available
Notes and metadata
  • Provider: Hive
  • Languages: interface_en
  • Inputs: Image/video, Audio, API
  • Link checked: 2026-09-04

Confidence scores are not proof of authenticity. Check rights, consent and current privacy terms before uploading media.

Open tool at provider
Sightengine
automatically reachable · Link checked: 2026-09-04

Sightengine AI Media Detection

Web and API service for checking AI-generated images and other synthetic media; free starter credits require an account.

What is it useful for?

Useful for reproducible image checks and technical tests with API output.

AI image/video detectorAI image/video detectorAPI available
Notes and metadata
  • Provider: Sightengine
  • Languages: interface_en
  • Inputs: Image/video, API
  • Link checked: 2026-09-04

Results depend on file format, editing and generator. A negative result does not rule out AI generation.

Open tool at provider
IlluminartyA few free checks · Premium available
automatically reachable · Link checked: 2026-09-04

Illuminarty

Image detector for potentially AI-generated, synthetic or manipulated images, with optional advanced functions and an API.

What is it useful for?

A quick additional comparison for image material and possible local manipulation.

AI image/video detectorAPI available
Notes and metadata
  • Provider: Illuminarty
  • Languages: interface_en
  • Inputs: Image/video, API
  • Link checked: 2026-09-04

Localisation and generator attribution are probabilistic. Do not upload confidential or personal images without reviewing the terms.

Open tool at provider
OpenAIFree · no account
automatically reachable · Link checked: 2026-09-04

OpenAI Verify

Official verification tool for provenance signals such as C2PA metadata or watermarks in supported image and audio files from OpenAI tools.

What is it useful for?

Especially useful when checking whether a file contains verifiable OpenAI provenance signals.

AI image/video detectorWriting process/authorship
Notes and metadata
  • Provider: OpenAI
  • Languages: interface_en
  • Inputs: Image/video, Audio
  • Link checked: 2026-09-04

This is not a general detector for every AI generator. Missing provenance signals do not prove that a file was human-created.

Open tool at provider
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