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Deep AI Detector
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Trained on 2 billion+ text samples

The AI detector that catches what others miss.

Industry-leading accuracy on ChatGPT, Claude, Gemini, and paraphrased AI. Per-sentence verdicts you can act on. Same advanced detection model across every plan — paste below to try one free detection, no signup required.

Trained on 2B+ samples Per-sentence verdicts 20+ languages auto-detected
Definitely Human Likely Human Paraphrased Likely AI Definitely AI Plagiarism — Paid
Anonymous: up to 1,000 words
Press Command Enter or Control Enter to submit detection.
Current word count:0 / 1,000 words
Run detection · 1 credit Deep Scan · 2 credits (double — Starter $14.99 and up) Plagiarism · 1 extra credit

Plans & pricing

Every plan runs the same advanced detection model trained on 2 billion+ text samples — monthly quota, per-document word limit, and feature gating are the only differences. One-time word packs from $5 (credits never expire) stack with any plan, including Free.

From $6.66 per million words. Industry-leading AI detection at industry-leading per-word pricing — see the full pricing grid for every tier and one-time word pack.

Subscriptions — monthly quotas

Free

$0 · No card required

$0/month

$0 per million words

  • • 5 detections/month registered · 1 anonymous
  • • 1,000 words per document
  • • Same advanced detection model paid plans use
  • • 7-day detection history (registered)
  • ✗ Per-sentence verdicts
  • ✗ Deep Scan and Plagiarism
Sign up free
Most popular

Pro

For freelancers & small teams

$34.99/month

$20 per million words

  • • 500 detections/month
  • • 3,500 words per document
  • • Per-sentence verdicts
  • • Deep Scan + Plagiarism scanning
  • • PDF + JSON export
  • • REST API access (coming soon)
  • • Strictness toggle (lenient / balanced / strict)
  • • Forever detection history
Choose Pro

Business

For agencies & publishers

$179.99/month

$10 per million words

  • • 1,800 detections/month
  • • 10,000 words per document
  • • Everything in Pro
  • • 7 team seats
  • • Bulk upload + batch processing
  • • Priority processing
  • • Counterfactual analysis
  • • Email support
Choose Business

Enterprise

For SLA-bound institutions

$999/month

$6.66 per million words · Our lowest rate

  • • 5,000 detections/month
  • • 30,000 words per document
  • • Everything in Business
  • • 25 team seats
  • • Unused detections roll over for 12 months
  • • Webhooks (coming soon)
  • • Dedicated customer success manager
  • • Onboarding & training
  • • SLA + dedicated support
Choose Enterprise

One-time word packs — credits never expire

Starter Pack

One-time

For occasional checks

$5· 50,000 words

$100 per million words

  • • Stack with Free or any subscription
  • • Credits never expire while account is open
  • • Same advanced detection model
  • • Per-sentence verdicts enabled
  • • Unused balance refundable on request
Buy Starter Pack

Business Pack

One-time

For sustained editorial review

$100· 1.75M words

$57 per million words

  • • ~35× the words-per-dollar of Starter Pack
  • • Stack with any subscription
  • • Credits never expire
  • • Per-sentence verdicts + Deep Scan
  • • Unused balance refundable on request
Buy Business Pack

Enterprise Pack

One-time

For institutional workloads

$500· 12M words

$42 per million words

  • • ~120× the words-per-dollar of Starter Pack
  • • Stack with any subscription
  • • Credits never expire
  • • Per-sentence verdicts + Deep Scan + Plagiarism
  • • Unused balance refundable on request
Buy Enterprise Pack
Best value

Titan Pack

One-time

For platforms & data pipelines

$5,000· 175M words

$28.57 per million words · Cheapest one-time pack

  • • Built for bulk-classification workloads
  • • Credits never expire
  • • Per-sentence verdicts + Deep Scan + Plagiarism
  • • Unused balance refundable on request
Buy Titan Pack

Need a different shape? Browse all 8 subscription tiers and 8 word packs on the pricing page, including Starter ($14.99), Studio ($99.99), Scale ($499), Premier ($749), and the intermediate $20/$50/$250/$1,000 word packs. Or compare pay-as-you-go and API-only for non-subscription workflows.

Industry-leading AI content detection. Trusted by educators, editors, and platforms worldwide.

What sets us apart

Built for accuracy, not marketing claims

Deep AI Detector is trained on 2 billion+ text samples covering every major LLM, every major content category, and every common evasion technique. The result is per-sentence verdicts you can act on.

Per-sentence verdicts

Colour-graded sentence-level analysis shows exactly which lines look AI-generated. Defensible in academic, editorial, and HR contexts.

Trained on 2B+ samples

Our advanced AI detection model is trained on a balanced corpus of human writing and output from every major LLM family. Industry-leading accuracy on flagship models.

Catches paraphrased AI

Catches humanized AI rewrites that other detectors classify as 97%+ human. Designed to spot evasion attempts that fool single-signal detectors.

Updated weekly

20+ languages, auto-detected

Native support for English, Spanish, French, German, Hindi, Portuguese, and more. Paste text in any supported language — accuracy stays intact.

REST API + webhooks

OpenAPI 3.1 spec, idempotent endpoints, pricing quote on every response. Bring your own webhook for batch jobs.

Real-time analysis

Sub-second verdicts on most documents. No queues, no waiting rooms. Run hundreds of detections back-to-back from the dashboard or API.

Who is this for

Built for people who act on the result

If a verdict will inform a decision, you need a detector that earns confidence — not just a score in a vacuum.

Teachers + academic integrity offices

Screen student submissions with per-sentence verdicts that hold up in disciplinary hearings. Catch heavily edited AI essays that fool legacy detectors.

Editors + publishers

Verify freelance copy and submitted manuscripts. Spot undisclosed AI co-authorship before it ships under your masthead.

Content marketing teams

Audit freelance writers against AI-disclosure contracts. Confirm that the human-written deliverable in your brief is actually human-written.

Recruiters + HR

Screen candidate writing samples, statements of purpose, and cover letters. Identify AI-assisted applications without flagging legitimate writing.

Platforms + UGC moderators

Detect AI-generated reviews, comments, and submissions at scale through the REST API. Webhook-driven for bulk pipelines.

Developers + product teams

Add AI detection to your own app in a single API call. Pricing quotes returned on every response. JavaScript and Python SDKs ready to drop in.

How we compare

Detection that's straightforward about what it does

We respect the competition. We just price differently and catch more paraphrased AI.

Deep AI DetectorGPTZeroOriginality.aiCopyleaksTurnitinWinston AIZeroGPT
Free tier 5/mo registered · 1,000 wordsLimitedTrial onlyTrial onlyInstitution-only2K-word trialAd-supported
Starter price$14.99/mo$15/mo$14.95/mo$10.99/mo~$3-10K/yr seat$12/mo$9.99/mo
Cost per 1M words (cheapest tier)$37/M$99.93/M$74.75/M$99.90/M~$30-60/M$150/M$99.90/M
Cost per 1M words (best tier)$6.66/M (Enterprise)$47.98/M$49.92/M~$50/M~$30/M$160/M$66.63/M
One-time word packs$28.57/M (Titan Pack)——————
Per-sentence verdicts All paid tiersPro tierPro tier
Trained on 2B+ samplesProprietaryProprietaryProprietaryProprietaryProprietaryPerplexity-based
Languages20+ auto-detectedEN, ES, FR, othersEnglish primary30+English-firstBroad coverageMultiple, EN-tuned
REST API Pro ($34.99) — coming soonPro+Business+InstitutionalAdvanced+Max tier
Catches paraphrased AI Partial Partial Variable
Self-serve sign-up Institution-only
Text retention default24h, then deletedOpt-outAccount-boundAccount-boundSimilarity indexAccount-boundAccount-bound
Deep AI Detector vs GPTZero → Deep AI Detector vs Originality.ai → Deep AI Detector vs Copyleaks → Deep AI Detector vs Turnitin → Deep AI Detector vs Winston AI → Deep AI Detector vs ZeroGPT →
How it helps

From paste to actionable verdict in seconds

Deep AI Detector reads your text the way an experienced editor would, then returns a structured verdict you can show, share, or store. No black-box scores. No mystery percentages. Every result comes with per-sentence highlights so reviewers can see exactly which lines drove the decision.

AI detection is probabilistic and we say so plainly. When a piece of text sits in the gray zone — heavily edited AI, AI-assisted human writing, very short snippets — we surface the uncertainty rather than guessing. The "Paraphrased" band exists for precisely those cases, so reviewers know when to read closer.

The verdict ships with a confidence band, a domain classification, and (on paid tiers) a downloadable report. Drop it into a case file, an academic appeal, an HR record, or a customer-facing dispute — the explainability is built to defend a decision, not hide behind a number.

Read the research → See the API →

01
Paste any text
Up to 5,000 words per detection on paid tiers. 20+ languages auto-detected.
02
Real-time analysis
Industry-leading accuracy on every major LLM. Sub-second response on most documents.
03
Per-sentence verdicts
Colour-graded breakdown shows exactly which lines look AI-generated and which don't.
04
Confidence band
We tell you how confident the result is — and when it falls in the gray zone.
05
Downloadable report
PDF + JSON export on paid tiers. Drop it straight into a case file or appeal.
06
Privacy by default
Submitted text deleted within 24 hours. No training on your data without explicit opt-in.
What makes it different

The accuracy you'd expect. The transparency you wouldn't.

Most AI detectors give you a number and a vibe. Deep AI Detector gives you a verdict you can defend.

Trained on 2 billion+ samples

Our advanced AI detection model has seen more LLM output than any production detector. Coverage spans every major model family released in the last three years.

Catches what other detectors miss

Paraphrased AI, humanized rewrites, AI-with-light-edits — content that legacy detectors flag as 97%+ human. We catch the evasion attempts, not just the obvious cases.

Per-sentence, not per-document

A document-level score tells you almost nothing. Per-sentence verdicts tell you which paragraphs to re-read, which sources to verify, and which lines to ask the writer about.

Honest about edge cases

When the model isn't confident, we say so. The "Paraphrased" band exists precisely so reviewers don't act on a number that's really a coin flip.

Built for reviewers

Downloadable reports, shareable links, case-file-ready PDFs. Designed for people whose verdicts have consequences.

Privacy that's actually private

Submitted text deleted within 24 hours. No training on your data. No selling to advertisers. Hash-based caching means even our cache never sees your text in plaintext.

Questions, answered

FAQ

How accurate is Deep AI Detector?

Industry-leading accuracy on flagship LLMs including ChatGPT, Claude, Gemini, Llama, Mixtral, DeepSeek, Qwen, and GLM. Our advanced AI detection model is trained on 2 billion+ text samples covering both clean AI output and modern evasion techniques. Edge cases — heavily edited AI, AI-assisted human writing, very short text — are surfaced with explicit "Paraphrased" or low-confidence bands rather than guessed at.

Can it detect every AI model?

It generalizes well to most modern instruct-tuned LLMs because our training corpus spans every major model family, plus paraphrased and humanized AI text. New model releases are added to the corpus and the model is updated regularly. AI text that has been heavily rewritten by hand will be harder to detect — no honest detector should claim otherwise.

What about paraphrased or humanized AI text?

This is where Deep AI Detector pulls ahead of legacy detectors. Most detectors rely on a single signal that paraphrasing tools are specifically designed to defeat. Our model is trained on humanized AI output, paraphrased rewrites, and AI-with-light-edits — so it catches evasion attempts that other detectors classify as 97%+ human.

Is my text stored?

Not by default. Submitted text is deleted from logs and cache within 24 hours unless you explicitly opt in to detection history. We never train models on your text without per-product opt-in. Our cache stores hash + result only, never plaintext.

Can I use this for academic decisions?

You can use it as one piece of evidence in a larger review process — never as the sole basis for an academic, employment, or legal consequence. AI detection is probabilistic. We publish our confidence bands and known failure modes precisely so reviewers can use the tool responsibly.

What's the difference between tiers?

Every tier — free included — runs on the same advanced detection model trained on 2 billion+ samples. Anonymous gets 1 detection/month, registered free gets 5/month, both up to 1,000 words. Starter ($14.99) and Pro ($34.99) add higher monthly quotas, per-sentence verdicts, downloadable reports, Deep Scan, and plagiarism scanning. Studio ($99.99), Business ($179.99), Scale ($499), Premier ($749), and Enterprise ($999) layer on team seats, bulk upload, dedicated support, and higher per-document limits. See the pricing page for the full grid.

Do you offer an API?

REST API access is launching soon on Pro ($34.99/mo) and above, plus PAYG / API-only top-up. POST /v1/detect for single-shot detection, POST /v1/detect/deep for per-paragraph breakdown, webhooks for batch jobs. Preview the API docs →

Can I cancel anytime?

Yes. Cancellation is self-service from your billing dashboard — there's no penalty and no retention call. Access continues through the end of your current billing period. New subscriptions are refundable within 7 days of the original charge if no detections have been run; once any detection has been performed, the charge is non-refundable. Prepaid credits are refundable on service issues. See the refund policy for the full terms.

Do you support multilingual detection?

Yes — 20+ languages auto-detected. Native support for English, Spanish, French, German, Hindi, and Portuguese, with additional language coverage through our advanced detection model. Paste text in any supported language — the verdict you get is for the original.

How is this priced compared to GPTZero / Originality?

We undercut incumbents at every volume tier without sacrificing accuracy. The full advanced detection model is available from $14.99/mo — competitive with or below the starting prices of legacy detectors. See pricing for the per-tier breakdown.

Ready to detect AI text?

Paid plans from $14.99/month. Free tier available. Cancel any time, no penalty.

Get Starter — $14.99/month Sign up free

What is Deep AI Detector?

Deep AI Detector is an AI content detection tool that reads any text passage — essays, manuscripts, articles, emails, reviews, marketing copy — and returns a per-sentence verdict on whether each line was written by a person or generated by an AI. The advanced detection model is trained on 2 billion+ samples covering every major LLM family released in the last three years (ChatGPT, Claude, Gemini, Llama, Mixtral, DeepSeek, Qwen, GLM) and the paraphrased and humanized variants that legacy AI detectors typically misclassify as human. The same model runs on every tier — only quota, word limit, and feature gating differ.

How does Deep AI Detector compare to other AI detectors?

The two questions that decide an AI detector evaluation in 2026 are paraphrased AI catching and per-sentence explainability. Deep AI Detector is tuned for both. Paraphrased AI — text run through tools like QuillBot or Undetectable.ai — is the standard failure mode for legacy detectors, which often classify these rewrites as 97%+ human. Our model is calibrated against thousands of paraphrased samples and returns a defensible verdict with sentence-level highlights. See our comparisons against GPTZero, Originality.ai, Copyleaks, Turnitin, Winston AI, and ZeroGPT for side-by-side detail.

How does AI content detection actually work?

Most public detectors lean on a single signal — perplexity, a fine-tuned classifier, or a watermark probe. Deep AI Detector combines six independent layers of evidence and reports them transparently rather than hiding behind a single number:

  • Distributional rhythm. Sentence-length variance (burstiness), lexical diversity (hapax ratio), and paragraph-block uniformity. LLMs cannot easily fake these without explicit prompting, and the signal survives paraphrasing.
  • Token-level probability. An ensemble of probability and rank-based signals that flag spans where token choices are suspiciously typical of generated text.
  • Vocabulary & phrase patterns. A corpus of 1,200+ patterns characteristic of LLM output — function-word collocations, hedging templates, and the connective phrases that survive most rewriting tools.
  • Domain-aware calibration. 26 content domain classifiers (academic essay, news brief, marketing copy, product description, and more) calibrate the verdict to the baseline of that domain, so a polished press release isn't auto-flagged as AI just because it reads cleanly.
  • Multilingual analysis. 20+ languages supported natively with per-language calibration so verdicts are honest regardless of source language.
  • Confidence band. Every result ships with a confidence band so reviewers know whether to act, double-check, or escalate.

A determined attacker has to defeat rhythm, token probability, vocabulary, domain calibration, and confidence aggregation simultaneously — not just one of them. That is why Deep AI Detector reliably catches paraphrased ChatGPT output, humanized GPT-4 essays, Claude rewrites, and Gemini summaries that single-signal detectors classify as human.

Who uses Deep AI Detector?

Teachers and academic integrity offices use Deep AI Detector to screen suspected AI-assisted student submissions and to defend the result in an academic appeal. Editors, publishers, and content marketing teams use it to verify freelance copy against AI-disclosure clauses. Recruiters and HR teams use it on candidate writing samples and statements of purpose. Platforms and UGC moderators use it to catch AI-generated reviews, comments, and spam submissions at scale. Developers (Pro tier and above, REST API launching soon) embed the detector into their own products.

Is there a free AI detector with no signup?

Yes. The Deep AI Detector home page accepts one detection per month per IP with no signup, up to 1,000 words per document, on the same advanced detection model paid plans use. Create a free account and you get 5 detections per month plus 7-day history. Paid plans starting at $14.99/month lift the quota and add per-sentence highlighting, PDF + JSON export, multilingual support across 20+ languages, and (from Pro tier upward) REST API access.

How accurate is Deep AI Detector?

Accuracy depends on the text. Long-form unedited AI prose (300+ words) is the easiest case and the detector flags it with high confidence. Paraphrased AI — text run through a rewriter — is the hardest case in the field and where the 2 billion+ sample training corpus pays off. Short text (under 150 words) is genuinely ambiguous for any detector, so we return a lower-confidence band rather than overclaiming. We don't claim 100% accuracy. AI detection is probabilistic, and treating it as deterministic is how a real person gets harmed by a wrong verdict. Use the per-sentence breakdown as evidence, not as a single number to point at.

Does Deep AI Detector work in languages other than English?

Yes, with 20+ supported languages including Spanish, French, German, Portuguese, Hindi, Italian, Dutch, Polish, Indonesian, Vietnamese, Turkish, Arabic, Japanese, Korean, and Chinese. Paste text in any supported language and the detector returns a verdict on the original text. Multilingual coverage is available on every paid tier.

How does Deep AI Detector handle my data?

Submitted text is deleted from logs and cache within 24 hours unless you explicitly opt into detection history. The result cache stores hashed verdicts, not plaintext, so identical text returns a cached result without either copy ever being stored in plain text. We never train on customer submissions without per-product opt-in. Read the full privacy policy for the complete breakdown.