Hello there! Based on your needs, I would recommend ChatGPT as a suitable tool for creating a chatbot for educational purposes.

ChatGPT uses natural language processing to converse like a human, making it an excellent tool for answering student questions and providing in-depth understanding of topics. It can be accessed online, making it convenient for both you and your students.

One of the key features of ChatGPT is its ability to provide 24/7 support and guidance. This means your students can ask questions anytime they want, reducing the need for you to be constantly available. It also offers personalized recommendations based on the student's previous interactions, helping them understand what they should focus on next.

Another great feature is the gamified learning aspect. ChatGPT can turn study materials into games, keeping students engaged and interested in their learning. This tool can also help reduce your workload by taking over some teacher tasks, giving you more time for lesson planning and grading.

ChatGPT also promotes active learning and critical thinking by engaging students in conversation, requiring them to think more about their answers. It can also provide quick access to learning materials, making it easier for both you and your students to get the support you need when you need it.

In terms of pricing, ChatGPT offers a free plan with basic features and a ChatGPT Plus plan at $20/month for faster responses and additional features.

Please note that while ChatGPT is a powerful tool, it may sometimes provide incorrect or biased answers and may not always understand the context. However, its benefits in terms of accessibility, personalized help, and ease of use make it a valuable tool for educational purposes.