Discontinued and broken AI detectors

Name: Discontinued and broken AI detectors
Creator: Human-Only
License: https://creativecommons.org/licenses/by/4.0/

Tools tracked: 11
Withdrawn: 3
Offline: 3
Redirected: 3
Broken: 1
Moved: 1
Last automated check: 22 Oct 2026

Discontinued, broken and redirected AI detectors
Tool	Status	Stopped working at the original URL	Original URL and what it does now	Last working copy	Sources
AI Content DetectorContent at ScaleCompany tool	Redirected	Unknown	`contentatscale.ai/ai-content-detector/`Redirects (301 → 301 → 200)Ends at `moxby.com/marketplace/ai-content-detector`Checked 22 Oct 2026	26 Aug 2024 (Wayback Machine capture of AI Content Detector)	Sources (4) for AI Content Detector, Content at Scale Wayback Machine capture, 26 Jan 2023 (page title: Free AI Detector - AI Content Detection for GPT-3 + ChatGPT) Wayback Machine capture, 26 Aug 2024 (last capture with HTTP 200) Wayback Machine capture, 27 Aug 2024 (HTTP 301 to brandwell.ai/ai-content-detector/) Weber-Wulff et al. (2023), Testing of detection tools for AI-generated text. International Journal for Educational Integrity 19, 26
AI Content DetectorCrossplagCompany tool	Offline	Unknown	`crossplag.com/ai-content-detector/`HTTP 404 after redirect (301 → 301 → 404)Ends at `inspera.com/ai-content-detector/`Checked 22 Oct 2026	14 Mar 2023 (Wayback Machine capture of AI Content Detector)	Sources (5) for AI Content Detector, Crossplag Wayback Machine capture, 14 Mar 2023 (page title: AI Content Detector - Crossplag) Wayback Machine capture, 12 Jan 2026 (page title: AI Content Detector) Wayback Machine capture, 3 Feb 2026 (HTTP 301) Liang et al. (2023), GPT detectors are biased against non-native English writers. Patterns 4(7) Perkins et al. (2024), Simple techniques to bypass GenAI text detectors. International Journal of Educational Technology in Higher Education 21, 53
AI Content DetectorWriterCompany tool	Withdrawn	22 Dec 2025	`writer.com/ai-content-detector/`Redirects (301 → 200)Ends at `writer.com/#ai-detector`Checked 22 Oct 2026	9 Dec 2025 (Wayback Machine capture of AI Content Detector)	Sources (2) for AI Content Detector, Writer Wayback Machine capture, 9 Dec 2025 (page title: AI content detector \| ChatGPT detector & AI checker for GPT-4 - WRITER) Wayback Machine capture, 24 Dec 2025 (HTTP 301 to writer.com/#ai-detector)
AI Text ClassifierOpenAICompany tool	Withdrawn	20 Jul 2023	`platform.openai.com/ai-text-classifier`HTTP 403Checked 22 Oct 2026	None confirmed	Sources (1) for AI Text Classifier, OpenAI OpenAI: New AI classifier for indicating AI-written text
AI Writing CheckQuill.org and CommonLitNon-profit tool	Withdrawn	Aug 2023	`aiwritingcheck.org/`HTTP 200Checked 22 Oct 2026	17 Jul 2023 (Wayback Machine capture of AI Writing Check)	Sources (4) for AI Writing Check, Quill.org and CommonLit AI Writing Check: August 2023 Update - AI Writing Check is no longer available Wayback Machine capture, 17 Jul 2023 (the working tool) Wayback Machine capture, 12 Sep 2023 (the shutdown notice) Liang et al. (2023), GPT detectors are biased against non-native English writers. Patterns 4(7)
AICheatCheckThe Checker AICompany tool	Redirected	Unknown	`aicheatcheck.com/`Redirects (301 → 200)Ends at `thechecker.ai/`Checked 22 Oct 2026	11 Jun 2026 (Wayback Machine capture of AICheatCheck)	Sources (2) for AICheatCheck, The Checker AI Wayback Machine capture, 16 Jan 2023 (page title: Demo - AICheatCheck) Wayback Machine capture, 23 Sep 2023 (page title: Demo - The Checker AI)
DetectGPT (demo)Mitchell et al., authors of the DetectGPT paperResearch demo	Offline	20 Aug 2023 – 26 Nov 2023Between archive captures	`detectgpt.ericmitchell.ai/`HTTP 404Checked 22 Oct 2026	20 Aug 2023 (Wayback Machine capture of DetectGPT (demo))	Sources (3) for DetectGPT (demo), Mitchell et al., authors of the DetectGPT paper Mitchell et al. (2023), DetectGPT: Zero-Shot Machine-Generated Text Detection using Probability Curvature (arXiv:2301.11305) Wayback Machine capture, 20 Aug 2023 (page title: DetectGPT: a GPT-2 Detector) Wayback Machine capture, 26 Nov 2023 (HTTP 404)
GLTR (demo)MIT-IBM Watson AI Lab and Harvard NLPResearch demo	Moved	24 Jul 2023 – 27 Nov 2023Between archive captures	`gltr.io/dist/index.html`HTTP 404Checked 22 Oct 2026 `gltr.io/dist/`HTTP 404Checked 22 Oct 2026 Still answers at `demo.gltr.io/client/index.html`HTTP 200Checked 22 Oct 2026	21 Jul 2023 (Wayback Machine capture of GLTR (demo))	Sources (4) for GLTR (demo), MIT-IBM Watson AI Lab and Harvard NLP Gehrmann, Strobelt & Rush (2019), GLTR: Statistical Detection and Visualization of Generated Text (arXiv:1906.04043) Wayback Machine capture, 21 Jul 2023 (page title: GLTR (glitter) v0.5) Wayback Machine capture, 27 Nov 2023 (HTTP 404) Catching Unicorns with GLTR (project page on gltr.io)
GPT-2 Output Detector (demo)OpenAI, hosted on Hugging FaceResearch demo	Offline	8 Mar 2026 – 31 Mar 2026Between archive captures	`huggingface.co/openai-detector`HTTP 503 after redirect (308 → 503)Ends at `openai-openai-detector.hf.space/`Checked 22 Oct 2026 `openai-openai-detector.hf.space/`HTTP 503Checked 22 Oct 2026 Hugging Face Space: PausedChecked 22 Oct 2026	8 Mar 2026 (Wayback Machine capture of GPT-2 Output Detector (demo))	Sources (5) for GPT-2 Output Detector (demo), OpenAI, hosted on Hugging Face Wayback Machine capture, 8 Mar 2026 (page title: GPT-2 Output Detector) Wayback Machine capture, 31 Mar 2026 (HTTP 503) Hugging Face Spaces API: openai/openai-detector Liang et al. (2023), GPT detectors are biased against non-native English writers. Patterns 4(7) Weber-Wulff et al. (2023), Testing of detection tools for AI-generated text. International Journal for Educational Integrity 19, 26
GPTRadarNeuraltextCompany tool	Redirected	12 Jul 2026 – 14 Aug 2026Between archive captures	`gptradar.com/`Redirects (301 → 200)Ends at `neuraltext.com/`Checked 22 Oct 2026	12 Jul 2026 (Wayback Machine capture of GPTRadar)	Sources (3) for GPTRadar, Neuraltext Wayback Machine capture, 1 Mar 2025 (page title: GPT Radar \| AI text detector app; footer: GPT Radar is a Neuraltext experiment) Wayback Machine capture, 12 Jul 2026 (page title: GPT Radar \| AI text detector app) Wayback Machine capture, 14 Aug 2026 (HTTP 301 to neuraltext.com)
HC3 ChatGPT Detector (single-text Space)Hello-SimpleAI (HC3 project)Research demo	Broken	Unknown	`huggingface.co/spaces/Hello-SimpleAI/chatgpt-detector-single`HTTP 200Checked 22 Oct 2026 Hugging Face Space: Runtime errorChecked 22 Oct 2026	None confirmed	Sources (2) for HC3 ChatGPT Detector (single-text Space), Hello-SimpleAI (HC3 project) Hugging Face Spaces API: Hello-SimpleAI/chatgpt-detector-single Guo et al. (2023), How Close is ChatGPT to Human Experts? Comparison Corpus, Evaluation, and Detection (arXiv:2301.07597)

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