Jojobet

Jojobet is a vocabulary learning app that uses spaced repetition to combat the forgetting curve, the natural decay of memory over time, by re-exposing you to cards at strategic intervals calibrated to their knowledge levels. The core insight of spaced repetition is that re-studying a word just before you're likely to forget it is far more effective than re-studying it immediately after learning it. Jojobet's 0–5 system approximates this by reviewing lower-level cards more frequently and spacing out higher-level ones. Without spaced repetition, vocabulary learners typically study a word once, feel they know it, and then discover weeks later that it's completely gone from memory. Jojobet's system prevents this by scheduling the review sessions that memory science says are needed. The practical effect is that words you've genuinely learned in Jojobet tend to stick longer than words you've reviewed in simple sequential-order apps or random-shuffle systems, because the review timing was designed around your memory's actual needs rather than convenience. Spaced repetition in Jojobet is invisible in the sense that it requires no user setup: you just study, and the system automatically ensures you're reviewing the right cards at the right frequency to maximize long-term retention.