Firstly, the Roam toolkit isn't sustainable when topics become to complex. And secondly, the Neuracache app costs money (pro version). If I really spent 7,50$ (two Starbucks coffees) per month for Roam, I don't want to pay 2,90$ (one more Starbucks coffee) per month to use a flashcard app connected to Roam. NeuraCache (for Evernote, OneNote, Roam Research) Flashcards and Spaced Repetition for Evernote, Roam Research, Obsidian md by Marcin Czech. 10+ Thousand Downloads PREMIUM. Est. downloads PREMIUM. Recent d/loads 4.32 305 Rating Unranked Ranking 32 Libraries 6.0+ Android version 7/10/21.