This is really great! I'm building a SaaS that is similar to this, but I was feeling bummed about not releasing it as open source; but now I can just point people to this if they want to run their own. awesome!
I'm also planning and building on a flashcard app; and am facing a similar dilemma on whether to monetize (make it SaaS) or go all out open-source. At the moment my barometer seems to be leaning towards open source. I already have REST API backend done, and am working on UI.
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The only novelty on my app is that it uses an algorithm based on upvotes/downvotes (e.g. HN, Reddit, etc) to measure card performance rather than a variant based on SuperMemo and friends.
That depends on how you look at it. I'm using it, but is it ready for normal humans? I'm not sure. It's equally or more complicated than anki, and serves a larger usecase of doing the remembering for you and collaboration; and is not nearly as well documented as anki at the moment.
That said, if you're up for beta access, shoot me an email at r.letmein [a] ruru.name and i'll see about access
