Unverified50% confidenceFactExact time
After its release in 2006, Anki adopted an improved version of SM-2 and became the world's most popular spaced repetition tool.
1
Sources
50%
Confidence
Long-term
Relevance
8/9/2026
First Seen
Sources
Vocab Top：AI驱动的单词记忆留存工具深度解析
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