AI Detector Comparison — Side by Side

AI Detector Tools Compared (2026)

Accuracy figures based on our testing with 50 text samples (20 human, 20 GPT-4o, 10 Claude). Your results may vary.

Feature Comparison

Not all detectors are created equal. Here’s what separates them beyond raw accuracy:

How We Test

We use a standardized test set of 50 texts:

• 20 human-written (blog posts, essays, emails from diverse authors)
• 20 generated by ChatGPT-4o (with default settings, no system prompt)
• 10 generated by Claude 3.5 Sonnet

Each tool is tested blind on the same inputs. We measure:

• True positive rate — AI text correctly identified as AI
• False positive rate — Human text incorrectly flagged as AI
• Speed — Time from paste to result

All texts are between 150-500 words. We test each tool 3 times per text and use the median score to reduce variance.

Key Takeaways

Best accuracy: GPTZero and Copyleaks lead in raw detection accuracy, but both require payment for meaningful use.

Best free option: AI Detector and ZeroGPT both offer unlimited free checks. AI Detector adds word-level heatmap and rewrite suggestions that ZeroGPT doesn’t have.

Best for agencies: Originality.ai offers batch processing and team features, but at the highest price point ($15/month with no free tier).

Best for students: If you’re checking your own writing to avoid false positives, AI Detector’s word-level highlighting is the most useful — you can see exactly what to change.

What Accuracy Actually Means

An “89% accuracy” claim sounds impressive. But what does it mean in practice?

• On clear AI text (unedited ChatGPT output), most tools score 85%+ correctly
• On edited AI text (human-revised ChatGPT drafts), accuracy drops to 50-70%
• On formal human writing (academic, legal, technical), false positive rates climb to 10-20%

The takeaway: no detector is reliable enough to use as definitive proof. Use them as screening tools, not verdict machines.

Read more: AI Detector Accuracy: The Full Picture

Full Reviews

• 7 Best AI Detectors in 2026 — Full Comparison
• 5 Best Free AI Detectors (No Sign-Up)
• Why AI Detectors Keep Getting It Wrong
• AI Detector False Positives Explained
• Try AI Detector Free →

Detailed Comparisons

Looking for a specific matchup? Read our in-depth comparisons:

• GPTZero vs Originality.ai — The two biggest paid detectors, head to head
• ZeroGPT vs GPTZero — Free vs paid: is the upgrade worth it?
• Copyleaks vs Originality.ai — Education vs agency focus

Looking for a Free Alternative?

• Best GPTZero Alternative — Free word-level detection
• Best Originality.ai Alternative — Stop paying $15/month

Detect by AI Model

Not sure which AI wrote the text? Check model-specific detection:

• Detect ChatGPT Text — GPT-3.5, GPT-4, GPT-4o
• Detect Claude Text — Anthropic Claude 3, 3.5, 4
• Detect Gemini Text — Google Gemini Pro & Ultra
• Detect DeepSeek Text — DeepSeek V3, R1
• Detect LLaMA Text — Meta LLaMA 3, 3.1
• Detect GPT-4 Text — OpenAI GPT-4 specifically
• Detect GPT-4o Text — ChatGPT’s default model

Best AI Detector by Use Case

• For Students — Check essays before submitting
• For Teachers — Review student work with evidence
• For Bloggers — Ensure content authenticity
• For SEO — Content quality for search rankings
• For Copywriters — Verify client deliverables
• For Publishers — Manuscript screening
• For Hiring — Check resumes and cover letters
• For Freelancers — Prove your work is original