If you're looking for another TheChecker.AI alternative, Turnitin is a top contender. It has AI writing detection technology that spots AI-generated text and flags plagiarism, and it's a powerful tool for maintaining academic integrity. Turnitin caters to a range of education markets with products like Feedback Studio, Gradescope and iThenticate, so it's a broad tool for teachers.
Another option is Copyleaks, which spots AI-generated content but also offers a range of tools to improve writing quality and protect original work. Copyleaks supports more than 30 languages and can be integrated with Learning Management Systems, and it's a good option for schools and businesses.
Last, you could try Winston AI, which says it can spot AI content 99.98% of the time. It can handle multiple languages, and it's got a plagiarism checker and an AI image detector, too, so it's good for education and content creation.