Flashcard repetition system, web-based, 2 WEEKS, REALLY SIMPLE, open source similar

Hello there! There's an open source software named Anki which implements a flashcard system with a spaced repetition algorithm (SRA or SRS). Please, give it a look and watch any 10 minute youtube video to understand how it works. I would like something similar, but way more simple. Web-based, preferentially as a web progressive app. Python for desktop is ok, but... web based would be better. Caveat: *it needs to be done in two to three weeks* The good side is that I want something really, really minimalist. Only a way to create and edit simple flashcards (html) plus a spacing algorithm (can be as simple as a geometric progression). NO need for a pretty design.