AI Content Detector

AI Content Detector

Instantly analyze any text to determine if it was written by AI or a human.

0/4000 words

Select Available Detectors

Run connected checks now; more detector APIs are pending

ProofDetect
Free
ZeroGPT
1 credit
GPTZero
API pending
Originality.ai
API pending
Turnitin
Context only
Copyleaks
API pending
2 detectors selected | Cost: 1 credits

Run the detector check before your text gets judged

Turnitin
GPTZero
ZeroGPTZeroGPT
Originality.ai
Copyleaks
QuillBot
Winston AI
Turnitin
GPTZero
ZeroGPTZeroGPT
Originality.ai
Copyleaks
QuillBot
Winston AI
Turnitin
GPTZero
ZeroGPTZeroGPT
Originality.ai
Copyleaks
QuillBot
Winston AI

Detect, then rewrite — in one workflow

ProofWrite combines detection and humanization in a single workflow. Find the risky passages, send them to the humanizer, and verify the new version — all without switching tabs or copying text between tools.

ProofWrite Detector Advantages

Detection is most useful when it is connected to the rewrite workflow.

Detector-Oriented Review

Understand the risk signals your text may create across common AI detection workflows.

Sentence-Level Analysis

See exactly which sentences appear AI-generated and which read as human-written.

Built-in Humanizer

Found risky passages? Send them into the humanizer and compare the revised version.

Results stay in the workflow

Use the detector result to decide the next edit instead of treating it as a dead-end score.

AI Detectors Give Different Results — Here's Why

Detector disagreement is normal. Different tools weigh cadence, predictability, sentence length, and model fingerprints differently, so ProofWrite focuses on practical risk reduction instead of a single magic number.

Different scoring models

One detector may punish predictable word choice while another focuses on sentence structure or perplexity.

Different text lengths

Short snippets create weak signals. Longer passages usually give detectors more context and more confidence.

Different use cases

Different detectors use different thresholds, training data, and score calibration, so the same paragraph can receive different labels.

Why multi-detector matters

Different detectors weigh different signals. A text that passes one tool may fail another. ProofWrite cross-references multiple detection services so you see the full risk picture before submitting, publishing, or sending.

Use the detector to make a decision, not just read a number

A useful AI detector should reduce uncertainty. These are the moments where ProofWrite helps most.

Before submitting

Check an assignment, cover letter, or application draft before it reaches a reviewer.

Before publishing

Review blog posts, product pages, and newsletters so the copy reads edited, not generated.

Before sending important text

Check the final version in the same place you revise it, instead of copying it through several detector tabs.

Choose Your Plan

Start free with 250 words. Upgrade for higher limits and advanced features.

Standard

$19.99 /month

  • 20,000 words/month
  • 8 rewrite modes
  • Humanize 750 words/request
  • 30 free ProofDetect scans/day
  • All languages
  • 50 Credit/month Popular AI Detector
GPTZeroZeroGPTOriginality.ai
Most Popular

Pro

$34.99 /month

  • 60,000 words/month
  • 8 rewrite modes + new models
  • Humanize 1,500 words/request
  • Unlimited ProofDetect scans
  • All languages
  • 100 Credit/month Popular AI Detector
GPTZeroZeroGPTOriginality.ai

Ultra

$59.99 /month

  • Unlimited rewrite words
  • 8 rewrite modes + new models
  • Humanize 3,000 words/request
  • Unlimited ProofDetect scans
  • All languages
  • 200 Credit/month Popular AI Detector
GPTZeroZeroGPTOriginality.ai

Frequently Asked Questions







Ready to Improve Your Writing Quality?

Use ProofWrite to detect risky passages, humanize them, and compare the new version in the same workflow.