Phosphor - Spaced repetition app with FSRS: cards from lectures

Hi Product Hunt, Emon from Teamz Lab here. You watch a lecture, follow all of it, and a week later most of it is gone. Hermann Ebbinghaus measured that curve in the 1880s: the loss is steep at first, and every time you pull an answer back out of memory it flattens. Phosphor is a spaced repetition app built around that: it makes the cards, then brings each one back on the day it starts to fade. What is inside: - Cards from a YouTube lecture, a topic you type, or notes you paste. A summary and notes come first, then the flashcards. Each video card links to the second it came from. - FSRS scheduling. You grade a card Again, Hard, Good or Easy; hard cards come back sooner and easy ones wait longer. - A reminder timed to when a card starts to fade, with the question on it and the four grade buttons. - Quizzes, cloze cards and concept maps, so you are not tested the same way every time. - Export any deck to Anki, so you are never locked in. What it deliberately is not: a replacement for a big Anki deck you have tuned for years. If you enjoy writing your own cards, Anki is excellent. And a summary alone is not the goal here: it is the start, and the cards are what you keep. Free to start, and Pro lifts the limits. Android is live today; the iPhone version is next, and its App Store link is already on this page. If you already use spaced repetition: what keeps you on your current app, and what would make you switch?