Description
TheChecker.AI is an AI content detector built for people who want to check their own writing before someone else does: a student before handing in an assignment, a writer before publishing, or an editor screening what came in. A user pastes text into the tool and gets back an AI probability score along with supporting perplexity and burstiness measurements, the statistical patterns the detector says distinguish human writing from AI-generated text.
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Results are broken down at the sentence and paragraph level rather than as a single number, so a user can see which specific passages read as AI-written. The company reports 93% accuracy across more than 40 AI models it tracks, including Claude, GPT-5, Gemini, Llama, and Mistral, and says it updates its detection as new models are released.
TheChecker.AI also includes an AI humanizer: text flagged as AI-generated can be rewritten to read more naturally while keeping its original meaning, with a free tier covering a paragraph and a free account unlocking 1,000 words. Beyond the web app, the product ships a Model Context Protocol server with two tools, detect_ai_content and humanize_text, so Claude or another MCP-aware client can call the detector or the humanizer without leaving the chat. A Chrome extension and a documented API are also available.
A free demo lets anyone test up to 1,000 characters without creating an account. Paid access starts at $9.90 a month, or $99 a year (about $8.25 a month), for unlimited detections, 5,000 humanizer words a month, and sentence-level analysis across the full range of tracked models. The company states that submitted content is analyzed in real time and is not permanently stored on its servers.
TheChecker.AI is currently optimized for English content; the company lists broader language support as a planned feature rather than something available today, and it is also marketed as a Turnitin, GPTZero, and Copyleaks alternative for schools and independent writers.
- CategoryAI Content Detectors
- Pricing ModelPaid
- DeploymentCloud
- PlatformsWeb, Chrome
TheChecker.AI's Core Features
Scores pasted text for the probability it was generated by an AI model, across Claude, GPT-5, Gemini, Llama, Mistral, and more than 40 models total.
Shows an overall AI probability score alongside perplexity and burstiness metrics used to make the call.
Highlights results at the sentence and paragraph level rather than a single overall score.
Includes an AI humanizer that rewrites flagged text to read more naturally while keeping the original meaning.
Offers an MCP server with detect_ai_content and humanize_text tools for Claude and other MCP clients.
Ships a Chrome extension and a documented API for building detection into another workflow.
Free demo lets anyone test up to 1,000 characters of text without an account.
States that submitted content is analyzed in real time and not permanently stored on its servers.
How to use TheChecker.AI?
Try the demo: Paste up to 1,000 characters of text into the free demo box to see an AI probability score.
Read the breakdown: Check the sentence-level highlighting and confidence score to see which parts look AI-written.
Humanize if needed: Send flagged text to the humanizer to get a rewritten version that keeps the same meaning.
Create an account: Sign up for unlimited detections and a monthly humanizer word allowance.
Connect via MCP: Add TheChecker.AI's MCP server to Claude or another MCP client to detect or humanize text directly.
TheChecker.AI's Use Cases
- Pre-submission draft check
- Editorial review
- Rewriting flagged text
