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    Elton Lin
    Directly ask for explanations about linear algebra, algorithms etc. from "youtube teachers". This combines the clarity of an in-person explanation with the efficiency of async communication, and is much cheaper - $10/month instead of hourly private tutoring.
    explanations.app
    explanations.app
    Low-cost group tutoring made possible by blackboard videos
    Elton Lin
    Besides from minimizing the effort it takes to teach, any blackboard explanation can be turned into a lightweight, fileless video with 5-200x less memory than traditional videos.
    Looking for product feedback - it's ready to use anytime.
    Explain
    Explain
    Open education with crowdsourced blackboard videos