TheChecker.AI detects AI-written text across 40+ models and includes a humanizer. Free demo; paid plans start at $9.90/month.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
TheChecker.AI is a web-based AI content detector from Girema Holdings Limited. It scores a piece of writing for the likelihood that an AI model produced it, and the company says it recognizes more than 40 models, including GPT-4, GPT-5, Claude 3 and 3.5, Gemini Ultra, Llama and Mistral.
The product is framed around checking your own work first. The site describes students checking a draft before handing it in, professionals making sure their writing does not read as machine-written, and editors reviewing submissions. A separate humanizer tool rewrites AI-sounding text, and an MCP server connects both tools to Claude.
A user pastes or types text into the detector and runs the analysis. The site says the system compares the text against signatures from 40+ models and examines perplexity, burstiness and 14+ statistical language markers. Results are said to arrive in about 2.3 seconds.
The output is an overall AI probability score plus a paragraph-by-paragraph breakdown, with yellow shading for passages scoring 60 to 80 percent and darker yellow above 80 percent. The free demo box accepts up to 1,000 characters. Paid plans add sentence-level highlighting and PDF and document upload.
Detection covers an overall score, paragraph-level analysis and, on paid plans, sentence-level highlighting. The company publishes a 93% accuracy figure and a 2.1% false positive rate. Both are the vendor's own claims, and the sources do not describe how they were measured.
Beyond detection, the AI Humanizer rewrites machine-sounding text while keeping meaning, figures and names. The MCP server exposes detect_ai_content and humanize_text as tools in Claude or any MCP client, using self-serve OAuth. The site also lists API docs and a Chrome extension, though the sources give no details on either.
TheChecker.AI is a web-based AI content detector and humanizer from Girema Holdings Limited. It scores text for the likelihood that it was AI-generated and says it covers 40+ models, including GPT-5, Claude and Gemini. It also rewrites machine-sounding text with its humanizer.
The detector plan costs $9.90 per month or $99.00 per year, which is $8.25 per month. Both include unlimited AI detections and 5,000 humanizer words a month. Humanizer credit packs cost $5, $15 or $35 as one-time purchases, and Enterprise pricing is custom.
Yes, it offers free detector and humanizer demos that need no account. The detector demo box accepts up to 1,000 characters. A free account adds 1,000 humanizer words, and unlimited detection requires a paid plan.
The company states 93% accuracy across 40+ models and a published 2.1% false positive rate. These are the vendor's own figures, and the sources do not describe the testing method. Testing the free demo on your own text is a sensible check.
Yes. The company offers a Model Context Protocol server at api.thechecker.ai/mcp that exposes detect_ai_content and humanize_text as tools in Claude or any MCP client. Setup uses self-serve OAuth, and the same account and limits apply.
Text checked in the free detector demo is analyzed in real time and not saved. Scans run from an account are saved to it, and subscribers can reopen them from their history. Humanizer runs are always saved, and the company says it never sells content.
Not yet. The company says the tool is currently optimized for English, which gives its highest detection accuracy. Multi-language support is described as being on the roadmap.
It is best for students, writers, professionals and editors who want to read a draft the way a school or editor might before it counts. Institutions can use the Enterprise tier, which covers API integration, bulk user management and analytics.