GPTZero
Detects AI-written text from major models and checks writing quality, trusted by educators and writers.
Freemium
AI content detectors
16 tools · 13 with a free plan or free credits
AI content detectors help you figure out whether a piece of text or an image was made by a machine or a person. They are useful for teachers checking student work, writers verifying originality, and recruiters screening applications. Some tools focus on text, others on images, and a few handle both. You can also find tools that rewrite AI text to sound more human, which is a different angle on the same problem.
Among the 16 tools listed, GPTZero is a popular choice for educators, while Originality.ai combines AI detection with plagiarism checks. AI Image Detector focuses specifically on images, and Phrasly.AI offers both detection and humanization. Copyleaks covers text, video, audio, and images, making it a broad option. Each tool takes a slightly different approach, so you can pick based on your main need.
All AI content detectors
Originality.ai
It scans text for AI writing, plagiarism, and quality issues, helping writers and teachers verify originality.
Freemium
Copyleaks
Detects AI-written text, video, audio, and images while checking plagiarism across languages and code.
Freemium
Scite
Scite helps researchers search millions of papers and see whether claims are supported or contradicted.
Free trial
AI Image Detector
Analyzes any image in seconds to tell you if it was AI-generated, with a confidence score and detailed reasoning.
Free
AI or Not
Detect AI-generated text, images, videos, music, and deepfakes via API with high accuracy.
Freemium
CoverSentry
Scans your cover letter to tell if it reads as human, AI, or mixed, so you can pass recruiter screening.
Free
OmniDetect
Analyzes your text to show which passages read as AI, how strongly, and what to change before you submit.
Freemium
PreCheck.ai
Upload a face photo to find where it appears across the web, helping you monitor privacy and prevent misuse.
Paid
SafeNew AI
Creates a private AI model from your writing style to rewrite AI text into natural, human-like content.
Free trial
Corrector App
Checks your English, Tagalog, and 25+ other languages for grammar, spelling, and punctuation errors online.
Free
GhostPen
GhostPen rewrites AI-generated text to sound human and pass detection tools like Turnitin and GPTZero.
Freemium
Humantext.pro
Checks if text is AI-generated and rewrites it to sound naturally human for students and writers.
Freemium
IELTS Writing AI
It scores your IELTS essays instantly and gives detailed feedback based on official exam criteria.
Freemium
Phrasly.AI
Humanizes AI text, detects AI writing, and generates natural content for writers and students.
Freemium
Ryne AI
Rewrites AI text to pass detectors and offers study tools for students needing undetectable academic writing.
Freemium
How to choose among AI content detectors
- Text-focused: If you mainly need to check written content, GPTZero or Originality.ai are solid options. Both detect AI-written text and are trusted by educators and writers.
- Images: For AI-made images, use AI Image Detector. It gives a confidence score and reasoning, which helps when you need more than a yes/no answer.
- All-in-one: Copyleaks covers text, video, audio, and images, plus plagiarism. Choose it if you need to verify multiple content types in one place.
- Humanizing: If you want to rewrite AI text to pass detectors, GhostPen or Phrasly.AI can help. They are useful for students and writers who need natural-sounding output.
- Recruiter screening: CoverSentry is designed for cover letters. It tells you if your text reads as human, AI, or mixed, so you can adjust before applying.
AI content detectors FAQ
Which AI content detector is free?
AI Image Detector and CoverSentry are completely free. GPTZero, Copyleaks, and Originality.ai have freemium plans, so you can test them without paying. Free versions often have limits on the number of scans per day, so check the pricing details on each site.
Which tool is best for teachers checking student work?
GPTZero is trusted by educators and detects text from major AI models. Originality.ai also works well for teachers because it scans for AI writing, plagiarism, and quality issues. Both offer freemium plans, so you can try them with your own sample texts.
Can these tools detect AI images reliably?
AI Image Detector analyzes any image and gives a confidence score, which helps you judge reliability. AI or Not also detects AI-generated images, along with videos and music. No tool is 100% accurate, so use results as a guide rather than absolute proof.
Is it legal to use tools that rewrite AI text to pass detectors?
Using humanizing tools like GhostPen or Phrasly.AI is generally legal, but it may violate academic or workplace policies. If you are a student, check your school's rules on AI use. For professional writing, transparency about AI assistance is often expected. Always consider the context before using such tools.
Related categories
AI writing tools · AI tools for students · AI search engines · AI image generators · AI research tools · AI business tools