ClipQuery is a web app (clipquery.com) that lets you ask questions about YouTube videos: it answers from what is actually said, shows the exact moment, and can compare what several videos say in one table. The Basic plan is free forever with no card.
Without any tool: on a computer, open the video's description or the three dots under the video, choose Show transcript, then press Ctrl+F (Cmd+F on a Mac) and search a keyword. The matching line is highlighted with its time. This works well when you remember a word they used, and less well when you only remember the idea.
A real example from our own test: a 14-minute history video and the question "Why did so many banks fail during the Great Depression?" The answer arrived with time chips, and tapping one jumped straight to that part of the video.
Answers come from the video's transcript. If a video has no captions, ClipQuery can transcribe the audio on the Pro and Beast plans, which takes longer. You sign in with Google; ClipQuery keeps only your email address.
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Yes. You ask a question in plain words, and the answer points to the moment where it is explained.
Yes. Tapping it opens the video at that point, so you can listen to the original words.
Yes. Length limits depend on the plan, and the app tells you when a video is over your plan's limit.
The Basic plan is free forever with no card. Pro is $9 a month and Beast is $45 a month, each billed once for the period with no automatic renewal.