Question: Do you know of a study aid that uses natural-sounding voices to read out flashcard content, ideal for learning on-the-go?

NaturalReader is a full-featured text-to-speech tool that can handle lots of file formats, including PDF and Word documents. It's got AI technology, natural-sounding voices, support for more than 50 languages and a range of voices. With web, mobile and a Chrome extension, you can download MP3 files for offline listening and use OCR to scan physical documents. It's good for personal, educational and business use, so it's a good general-purpose tool for studying anywhere.

Another good option is the StudyCards App, which uses AI-powered information retrieval to create customizable talking flashcards. It's got a built-in text-to-speech engine for accessibility and supports multiple languages. You can swipe through flashcards and repeat them for better learning, and it integrates with Apple Watch and Android Wear devices for on-the-go learning. The app is easy to use and doesn't require sign-up, so it's a good tool for anyone who wants to improve their learning.

If you're looking for a more general-purpose text-to-speech tool, Narration Box offers high-quality, natural-sounding voiceovers in more than 140 languages and accents. It's got a user-friendly block-based interface, a large library of AI narrators, and advanced features like context awareness and emotive styles. With plans starting with a free tier and flexible pricing options, it's good for a variety of educational uses, including e-learning and audiobooks.