GPTKit

GPTKit is an AI-generated text detection tool. It uses several detection models to judge whether a piece of text was written by a human or produced by an AI such as ChatGPT, and it reports an accuracy rate of up to 93 percent. You can use it for free, with each check limited to 2048 characters, and registered users get a higher character limit. It combines six distinct detection methods into a single verdict. The tool is aimed at people who need a quick second opinion on text authenticity.

- Check whether text appears to be AI-generated or human-written

- Run detection with six different methods combined

- Use it free of charge up to 2048 characters per check

- Raise the character limit by registering an account

- Educators and reviewers checking whether submissions look AI-written

- Editors and moderators verifying content authenticity

- Anyone who needs a quick second opinion on a piece of text

Detection is not definitive. No tool can prove authorship with certainty, and a 93 percent accuracy claim still leaves room for error, so results should never be the sole basis for academic discipline, hiring, or publishing decisions. The free tier caps each check at 2048 characters, which is short for long documents. Detection methods also lag behind fast-changing AI models, so expect occasional misses on newer output, and treat any result as one input among several. For team use, agree on naming and editing conventions in advance to avoid version conflicts or duplicated work. Name and archive exported files consistently so you can find and reuse them, and keep a backup copy of key data.