Last updated 08-30-2026
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Pangram Labs
Pangram Labs checks whether text and images were created by AI. Paste or upload writing in PDF, DOCX, or RTF, drop in JPG, PNG, or WebP images, or run checks through browser extensions and LMS plugins to get prediction scores, segment-level highlights, and optional plagiarism matches.
Most classroom detectors lean on perplexity and burstiness, which flag polished human writing as often as they catch ChatGPT. Pangram trains proprietary classifiers on millions of human and AI documents instead, and its Pangram 4 release benchmarks 26 frontier models with a stated 99.7% hit rate. The dashboard also splits each document into AI-generated, AI-assisted, and human-written fractions rather than returning one opaque percentage.
Universities, publishers, content moderators, and developers use Pangram for assignment review, originality screening, and API-driven moderation queues. The free tier grants 2,000 words and 3 image scans per day, paid plans add plagiarism checks and higher word caps, and a Python SDK plus REST API let teams embed the same models in their own products.
Pangram 4 benchmarks 26 models including GPT-5.6, Claude Opus 5, Gemini 3, and Grok 4.3 with a stated 99.7% accuracy rate
Free plan includes 2,000 words and 3 image scans per day with no payment method required
Segment analysis reports the fraction of text that is AI-generated, AI-assisted, or human-written
Individual plan ($20/month) covers 300,000 words and 100 image scans monthly with plagiarism on every scan
Realtime API on Pangram 4 bills at $0.05 per 100 words with a 5 QPS limit; bulk jobs receive a 20% discount
LMS integrations for Canvas, Moodle, Google Classroom, Brightspace, Blackboard, and Schoology via LTI 1.3
Multilingual text detection across 20+ languages including English, Arabic, Chinese, Hindi, and Japanese
University of Chicago and University of Maryland evaluations report lower false positive rates than GPTZero and Originality.ai across multiple document types.
Segment-level scoring shows AI-generated, AI-assisted, and human-written fractions instead of a single opaque label.
Free tier grants 2,000 words and 3 image scans per day without requiring a payment method.
Image detection for JPG, PNG, and WebP uploads sits alongside text checks in the same dashboard.
SOC 2 Type 2 certification with optional zero data retention for enterprise API customers.
Plagiarism detection requires a paid Individual plan or higher and is not included on the free tier.
Pangram 4 API billing at $0.05 per 100 words costs ten times more per word than the legacy Pangram 3 endpoint.
Enterprise and institutional licenses require contacting sales rather than self-serve checkout.
Is Pangram Labs free to use?
Yes. Pangram Labs offers a free plan with up to 2,000 words and 3 image detection scans per day, plus AI assistance detection, file upload, OCR, browser extension access, and Google Docs integration. Paid plans add higher word limits, more image scans, and plagiarism detection on every scan.
How accurate is Pangram Labs?
Pangram Labs states over 99% accuracy and a false positive rate of 1 in 10,000 on aggregate public datasets. Independent researchers at the University of Chicago Booth School of Business and the University of Maryland have published evaluations comparing Pangram favorably to GPTZero and Originality.ai.
Which AI models does Pangram Labs detect?
Pangram Labs detects output from GPT-5.6, Claude Opus 5, Claude Sonnet 5, Gemini 3, Grok 4.3, DeepSeek, Llama, Mistral, and other frontier models. Its Pangram 4 model card lists 26 benchmarked models with per-model accuracy scores published on pangram.com.
Does Pangram Labs check for plagiarism?
Yes, on paid Individual, Professional, and Team plans. Pangram Labs compares submitted text against billions of webpages, academic journals, books, and news sources and can run AI detection and plagiarism checks in a single scan from the dashboard.
Does Pangram Labs offer an API?
Yes. Pangram Labs sells prepaid developer API credits from $25 to $2,000. The Pangram 4 realtime endpoint costs $0.05 per 100 words at 5 QPS, bulk document jobs receive a 20% discount, and a Python SDK is available alongside the REST API.
What languages does Pangram Labs support?
Pangram Labs detects AI writing in English, Arabic, Chinese, Czech, Dutch, French, German, Greek, Hindi, Hungarian, Italian, Japanese, Korean, Persian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish, Ukrainian, Urdu, and Vietnamese.
How do schools integrate Pangram Labs?
Pangram Labs connects to Canvas, Moodle, Blackboard, Brightspace, Schoology, and Google Classroom through LTI 1.3 integrations. Institutional licenses include unlimited AI and plagiarism checks inside the LMS, usage analytics, and compliance controls for student data.