I love the idea behind Spaced Repetition, and especially incremental reading. Reading incrementally (https://supermemo.guru/wiki/Incremental_reading) is the best way to retain information and helps you read faster too! I didn't see any app out there that had a modern user interface with good UX (SuperMemo is notorious for it's hard to grok interface). So I made my own https://github.com/melpomenex/incrementum-tauri and demo here: https://readsync.org

How does it work?

Not his old posts, but if you're at all interested in seeing his old streams circa 2015/2016, there's an ongoing live stream here: https://www.youtube.com/watch?v=1iyknwjYbRE