I built something like this for iOS/macOS, Manabi Reader, specifically for Japanese: https://reader.manabi.io https://reader.manabi.io It has collections of sho

I built something like this for iOS/macOS, Manabi Reader, specifically for Japanese: https://reader.manabi.io https://reader.manabi.io It has collections of short stories and other RSS-based reading materials for different levels. The reading materials are all written by native speaker humans, not AI-generated. It's also a general purpose web browser and RSS reader. Beyond Kindle capabilities, it also tracks the words, kanji, sentences you read to show you analytics based on that, chart your progress against JLPT levels simply by reading, and uses that data (all in your own iCloud/device storage) to coordinate flashcard review. I recently added early Anki integration. Still working hard on it, bringing more languages soon and cross-plat via SwiftWASM a bit later.