Question: I'm looking for a language learning tool that's challenging and tailored to my advanced level, can you suggest something?

If you're looking for a more challenging language learning tool geared toward serious students, Praktika is a top pick. This AI-powered service matches you with generative AI Avatar Tutors for one-on-one conversations, offers real-time feedback and has a large library of material. Its progress tracking and exercise generation are adaptive, so it can be a good fit for serious students who want to learn at their own pace. It's also significantly cheaper than traditional tutoring.

Another good option is Retention, which is geared toward reinforcing and expanding knowledge with quick drills. It uses AI to generate study materials, offer feedback and track progress. It's available in multiple languages, which makes it a good option for intermediate and advanced students who want to keep their skills fresh and improve them over time.

For a more general-purpose tool that works with more than 20 languages, LangAI offers real-time error correction and natural-sounding conversations on a range of subjects. It's got features like automatic transcription and human-sounding responses, so you can use it to practice conversations in everyday situations. You can use it for free with a daily limit or pay for unlimited use.

If you like a platform with high-end speech recognition and AI-powered conversations, Speak is another option. It offers free-form conversations and feedback on vocabulary and grammar, and it can be integrated with OpenAI's automatic speech recognition API. The app is designed to modernize language learning with new technology, so it's a good option for serious students who want to take advantage of new tools.