Turn YouTube lectures into flashcards you'll remember

Quick answer

You watched the whole lecture and took notes. A week later it's gone. Flashcards with spaced review are how a lot of students make video lessons stick.

What 125x is: 125x is a web app at 125x.app. You connect your YouTube subscriptions, and it gives you a feed of the latest videos from the channels you follow, each with a summary: a verdict, the 5 key takeaways, and the spoiler, plus Actionable and Lessons tabs with more tips. You read that and decide what's actually worth opening.

Open 125x

Start with the key points

Read the chapters, transcript or a summary to find the main ideas.
Note the timestamps of the parts worth a card. See YouTube transcript summary.

Write good cards

One idea per card.
Ask a question in your own words, so you're recalling instead of recognizing.
Add the timestamp so you can rewatch the explanation.
For diagrams, screenshot the frame and hide the labels.
Fewer, better cards. Skip anything you won't need.

Review daily

A few minutes every day beats a cram.
Delete or rewrite cards you keep missing because they're vague.
Make new cards the same day you watch.

How 125x fits

For channels you follow, 125x gives each video 5 takeaways and a Lessons tab. Those are a ready list of what to turn into cards. Write each one as a question and you're done in minutes.

FAQ: questions people ask

How do I make flashcards from a YouTube video?

Pull the key ideas from the transcript, chapters or summary, then write one question per idea in your own words.

How many flashcards should I make per video?

Only as many as the ideas you need to remember. Fewer, clear cards are easier to keep up with.

Should I add timestamps to flashcards?

Yes. A timestamp lets you jump back to the explanation when a card is hard.