Question: I need a platform that allows me to create and organize custom study sets for any subject, is there one that fits the bill?

If you're looking for a full-featured platform to build and manage your own custom study sets for any subject, Quenti is a great choice. It has a range of study modes, including flashcards, games and practice quizzes, and AI tools to generate more challenging multiple-choice questions and to grade written answers. Quenti lets you organize study sets into folders and import from Quizlet, and offers a free plan for students and more premium plans for teachers and companies.

Another option is OmniSets, a full-featured flashcard system that uses AI to optimize how you learn. You can create flashcards from any source material, and it has an adaptive learning algorithm that adjusts the pace of your study based on how well you do. It also has practice quizzes, games and collaboration tools, so it's a good option for students who want a lot of flexibility and are on a budget.

Monic.ai is another all-purpose study platform that uses AI to create custom study materials like quizzes, flashcards and summaries. It can handle a broad range of subjects and different learning styles, and has flexible pricing options, including a free basic plan. The idea is to make learning easier with a collection of interactive tools that can help people with different needs.

Last, Studyable has a range of tools for homework and academic work, including immediate answers to math problems, essay grading and flashcard creation from your notes or textbook. Thousands of students and teachers at top universities use the service, and it offers a range of pricing options, including a free plan, so it's a good option for a more comprehensive study aid.