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IB · Academic integrity · AI writing detection

Interpret AI-writing detection correctly.

What Turnitin, GPTZero, Copyleaks and other detectors measure—with current access models, result types and clear limits for educational decisions.

IA and EE sectionAI detectionShow sections
Two separate reportsTurnitin Similarity and Turnitin AI Writing answer different questions. Their percentages must not be added or compared directly.

Distinguish Turnitin Similarity from AI Writing.

The Similarity Report finds text overlap with comparison sources. The AI Writing Report instead evaluates language patterns in qualifying prose and estimates which passages may be AI-generated or AI-revised.

A paper can therefore have low similarity and a high AI-writing indicator—or the reverse. The two displays use different data, denominators and models.

No AI detector proves authorship. A technical indication must be interpreted alongside sources, drafts, version history and an academic conversation.

The detector measures language patterns—not the actual writing process.

Providers train classification models on human and machine-generated text. Depending on the tool, predictability, sentence variation, word choice, style and other statistical features are combined.

Document value

An estimated proportion or probability for AI-like passages in the analysed text.

Passage indicators

Sentences or paragraphs the model regards as particularly conspicuous.

Categories

Depending on provider: human, AI-generated, AI-refined or mixed.

Confidence

How confident the model is in its classification; not the real amount of AI use.

Use precise languageWrite “AI proportion estimated by the tool” or “text proportion classified as AI-like”—not “actual AI proportion”.

Make a detector comparison reproducible.

  1. Identical version: enter exactly the same text in every tool without intermediate revision.
  2. Adequate length: do not infer a whole document from one sentence; follow provider minimum lengths.
  3. Record metadata: tool, full URL, date, language, word count, account type, settings and visible model version.
  4. Preserve raw results: record percentage, classification, highlighted passages and errors separately.
  5. Do not average into “truth”: range, median and disagreement describe detector variation but cannot create a real AI proportion.
  6. Use controls: where possible, compare known human, known AI-generated and mixed texts of similar length and language.
  7. Discuss errors: examine false positives, false negatives and effects of translation, editing and short text.

For IB work, documented process matters more than a detector value.

Current IB and school rules on AI use are authoritative. Permitted assistance should be documented, while external or AI-generated material should be acknowledged and referenced transparently.

Drafts, notes, source logs, data, calculations, code history and version history also help demonstrate the student's actual contribution.

Links checked daily

AI text detectors for controlled counterchecks.

The directory shows access, input types, languages, use cases, limitations and the latest automated link check. Plans and features can change.

No single value is proof.Compare several signals and always review the actual writing and research process.
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 check2026-09-07 · 12:06
Next regular run2026-09-08 · 12:00
active entries22
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Changes in the latest run: No content change in the latest run.

11active tools
11AI text detectors
3plagiarism checkers
10with a free entry point
Check type
Access
Input

11 of 11 tools

ScribbrFree · no account
automatically reachable · Link checked: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

Check current storage and privacy terms before pasting unpublished work.

Open tool at provider
Pangram LabsFree limited · account optional
automatically reachable · Link checked: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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

Open tool at provider
ZeroGPTA few free checks · Premium available
automatically reachable · Link checked: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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: 2026-09-07

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
Primary sources

Read Turnitin's own report guidance.

Understand the Similarity Score

Turnitin's matching principle, an approximation formula, calculator and suitable plagiarism or similarity services.

Open Similarity guide

All checking tools

The complete, regularly checked directory for AI text, plagiarism, media and writing-process evidence.

Open full directory

Interpret detector values—make independent work visible.

For an IA or EE, transparent sources, individual decisions and a documented process matter.

Requirements and criteriaUnderstand similarity
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