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現場ノート計測済みライブラリから

計測した動画から分かったこと

私たちはYouTube動画を、尺のどれだけが実際に価値を届けているかで評価します。これは、数がそろって初めて見えてきたパターンです。

水増しの中央値 36% 役立つ部分が始まる中央値 0:47 再計算済み 19 Oct 2026

  1. 記事2026/9/16分

    Where our numbers come from, and where they do not apply

    Nine places where the measurements on this site stop being trustworthy, written down in one page so they do not have to be rediscovered one argument at a time.

  2. データレポート2026/9/16分

    Shelf life: how long the material in a video stays true, by subject

    Measured shelf life runs from 84.8 in science to 37.9 in tech news — a 47-point gap. Runtime does not predict it and neither does difficulty. Subject does.

  3. データレポート2026/9/16分

    Does a longer video teach you more? We checked, and the answer is yes

    Measured depth rises by 31 points from the shortest videos to the longest, holds inside every subject we can test, and buys less usefulness than you would expect.

  4. 記事2026/9/14分

    Do you need an account to use Gistil? Mostly, no

    Reading a measurement we already have takes no account. Asking for a video nobody has measured yet does. Here is exactly where the line sits, and why it is there.

  5. データレポート2026/9/17分

    A chapter list tells you where things are, not which one is worth watching

    Section by section across the library. The parts a chapter list would call content vary by 34 points inside a single video, and length barely predicts which is which.

  6. 記事2026/8/265分

    How to build a watch-later list you actually finish

    The list keeps growing because saving is free and watching is not. One rule, applied at the moment you save, fixes most of it.

  7. データレポート2026/8/266分

    The shape of a YouTube video: every value curve overlaid

    Average measured value climbs fast, holds through the middle two-thirds of a video, then falls sharply near the end. Here is the curve, averaged across the library.

  8. 記事2026/8/265分

    How to tell a good tutorial from a bad one in thirty seconds

    Six signals readable from the page before you commit any time, each tied to something we can actually measure across the library rather than a hunch.

  9. 記事2026/8/266分

    How to skip to the part of a YouTube video that actually matters

    Five ways to find the useful part of a video without watching the setup, ranked from the one everybody already tries to the one that works before you press play.

  10. 記事2026/8/265分

    How to search inside a long video without watching the whole thing

    Browser search only reaches the text on the page, not what's said. Chapters, comments, and the written record of the video each cover a different gap.

  11. データレポート2026/8/266分

    Runtime is a useless filter: longer videos carry less padding, not more

    Padding falls from 45% under ten minutes to 28% over an hour, and measured value rises the same way. Picking the shorter video is, on average, backwards.

  12. 記事2026/8/265分

    Is watching at 2x speed actually helping you learn?

    Speed compresses a video uniformly, filler and substance alike. Where doubling the speed helps, where it quietly breaks comprehension, and what it does not fix.