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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. Free tier — paste below and try it now, no signup required.

Trained on 2B+ samples Per-sentence verdicts 20+ languages auto-detected
Definitely Human Likely Human Paraphrased Likely AI Definitely AI Plagiarism — Pro
Anonymous: up to 1,000 words
Press Command Enter or Control Enter to submit detection.
Current word count:0 / 1,000 words

Plans

Free for individuals. Subscriptions for power users. Pay-as-you-go for occasional or developer use.

Free

$0 · No card required

  • • 1,000 words/doc
  • • Standard verdict
  • • Real-time analysis
  • ✗ Per-sentence verdicts
  • • 5/day anonymous · 50/day registered
Sign up free
Most popular

Pro · Advanced AI Detection

$19/mo

  • • 5,000 words/doc
  • • Full advanced detection model
  • • Per-sentence verdicts
  • • Paragraph-level breakdown
  • • 20+ languages
  • • PDF + JSON export
  • • Unlimited detections + API
Upgrade to Pro

Team

$79/mo · per seat

  • • 20,000 words/doc
  • • Unlimited dashboard usage
  • • $79 API credits/mo (PAYG-style)
  • • Top-up balance for more API
  • • Bulk upload · webhooks
  • • Priority processing (no cold starts)
Choose Team

Pay-as-you-go

No subscription

~$0.25 per detection · Top-up balance via Stripe

  • • Full advanced AI detection model
  • • Per-sentence verdicts
  • • Dashboard + API access
  • • 5,000 words/doc · 7-day retention
Buy credits →

API-only

Developers

~$0.25 per detection · API key only · No dashboard

  • • Just API endpoints — no web UI
  • • Top-up balance via Stripe
  • • Full advanced AI detection model
  • • Per-word OR per-detection billing
Get API key →

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.aiCopyleaks
Free tier 10/mo · 1,000 wordsLimitedTrial onlyTrial only
Starter price$9/mo$15/mo$14.95/mo$10.99/mo
Per-sentence verdicts All paid tiersPro tierPro tier
Trained on 2B+ samplesProprietaryProprietaryProprietary
Languages20+ auto-detectedEN, ES, FR, othersEnglish primary30+
REST API Plus tier ($39)Pro+Business+
Catches paraphrased AI Partial Partial
Text retention default24h, then deletedOpt-outAccount-boundAccount-bound
vs GPTZero in detail → vs Originality.ai → vs Copyleaks →
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?

Free tier gives you 10 detections/month with our standard pipeline. Starter ($9) and Pro ($19) add the full advanced detection model, per-sentence verdicts, and downloadable reports. Plus ($39) and Business ($99) add API access, bulk upload, and team seats. See the pricing page for the full grid.

Do you offer an API?

Yes — REST API with OpenAPI 3.1 spec, available on Plus tier and above, or as PAYG / API-only top-up. POST /v1/detect for single-shot detection, POST /v1/detect/deep for per-paragraph breakdown, webhooks for batch jobs. See the API docs →

Can I cancel anytime?

Yes. Cancel from your dashboard — access continues through the end of your current billing period. 14-day money-back guarantee on first subscription. No questions asked.

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 $9/mo — well below the $15+ starting prices of legacy detectors. See pricing for the per-tier breakdown.

Ready to detect AI text?

Free tier with no signup. Paid tiers from $9/month. Cancel anytime.

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