I'm not aware of a passive spaced repetition, which just presents items in increasing intervals without interrogating the subject's recall.
For all intents and purposes, the normal SR that everyone uses in the form of software and that everyone refers to when they use the term SR is not orthogonal to quizzing; it's quiz-driven.
I don't think that a passive strategy could be anywhere near effective as the actual SR algorithms in use, which incorporate feedback from quizzing in order to adjust the interval for each item, so that difficult items remain on short intervals while easy items recede farther into the future.
