Question: Do you know of a language learning platform that provides professional feedback on essays and supports multiple topics like vocabulary and grammar?

If you're looking for a language learning platform that offers professional essay feedback and supports multiple subjects, LangLabAI could be the way to go. It offers custom workbooks, contextual translations and real-world examples to help learners improve their language skills. Plus, it lets you submit essays for professional assessment and feedback, covering vocabulary, grammar, reading and writing.

Another good option is Speakable, which focuses on auto-graded speaking exercises in more than 100 languages. It offers cards for pronunciation, listening comprehension, writing and reading. Speakable offers instant AI-powered feedback on pronunciation, vocabulary and grammar, so it's good for language proficiency exam prep and unburdening teachers of grading work.

For more personalized and conversational language learning, check out Speak. The app uses sophisticated speech recognition and AI to offer feedback on vocabulary, grammar and other skills. It also integrates with OpenAI's automatic speech recognition API for better accuracy and response time, for a more immersive language learning experience.

Last, Studyable offers an AI-powered platform that includes an Essay Grader feature for immediate, personalized feedback on essays. It also offers tools for creating study sets and solving math problems, so it's a good option for language learners who want to improve their academic work.