CheckforAI

CheckforAi was once a free AI-based text detection tool, operated by a non-profit organization. Its purpose was to determine whether texts such as research papers or emails had been generated by models like ChatGPT. The detection algorithm combined the RoBERTa model, which OpenAI made open-source in its early stages, with a model developed independently by this team. Simply by pasting the text, the tool would provide an estimate of the likelihood that it had been generated by AI. When AI-based text detection tools first became popular in 2023, CheckforAi attracted a considerable number of users.

A notice has already been posted on the official website; the service is now officially discontinued. The team has moved on to work on new projects. On the page, only options for subscribing to the newsletter and providing a contact email are available anymore; it is no longer possible to submit text for detection.

If there are still detection needs, you can consider using tools such as GPTZero, Originality.ai, or Copyleaks, which are still being updated. For Chinese content, you might want to try the AIGC detection services provided by institutions like CNKI or VIP. However, it’s important to be aware that large language models are now producing increasingly human-like text, so any detection tool may occasionally give incorrect results. It’s best to use these findings as references rather than relying solely on the percentages they provide to make definitive conclusions.