Paste any YouTube playlist. Recall watches every minute, checks you after each part, and shows exactly what didn’t stick. Watching is always free.
Research keeps finding the same thing: a short test while you learn beats watching it again.
90% vs 68%
Final test scores when an online lecture was broken up by short tests, versus students who weren’t tested. Mind-wandering roughly halved (19% vs 41%) and tested students took about 3× the notes (24% vs 7% of slides). Re-studying the material instead of being tested didn’t help.
Harvard lab study, 80 students · Szpunar, Khan & Schacter · PNAS · 2013
Learned more, felt less
Harvard physics students taught actively scored higher — but felt they had learned less. Actual learning and the feeling of learning were anticorrelated.
149 students · Deslauriers et al. · PNAS · 2019
Confident ≠ learned
A fluent, confident instructor video made students more confident they’d learned — but they didn’t learn any more.
Instructor fluency experiment · Carpenter et al. · Psychonomic Bulletin & Review · 2013
≈ ½ SD
Classroom quizzing raised achievement by about half a standard deviation — from elementary school to university, across 18+ subjects. Bigger with feedback and repeated quizzes.
Meta-analysis: 222 studies, 48,478 students · Yang et al. · Psychological Bulletin · 2021
55× more rewinds
74% of learners attempted in-video quizzes — more than the 66% who finished the videos. Rewinds were 55× more frequent right after a quiz, and 76.5% of wrong answers were corrected within 30 minutes.
96,195 Coursera learners · Kovacs · ACM Learning @ Scale · 2016
Video itself isn’t the problem: grade 5–6 students remembered more a week later from video than from illustrated text — weaker readers most of all. (Haavisto, Lepola & Jaakkola · Learning and Instruction · 2025)
YouTube shows what you watched. Recall shows what you learned.
From a YouTube link to knowing exactly what didn’t stick — in five steps.
Drop in any public YouTube playlist or single video. No link handy? Pick from popular topics — CBSE, JEE, NEET, Python, guitar, Excel and more.
It watches each lecture end to end and places checkpoints where the topic actually changes — not at random timestamps. Your first lesson opens the moment it’s ready.
Long lectures become a clear list of parts, each with its own time range and checkpoint. Click a part to jump straight to it.
Four questions on what you just watched, graded in seconds — with an explanation for every answer you got wrong. Fix it now, not in the exam hall.
Every checkpoint and final test you’ve taken, grouped by video, with your score. Open one to see where you went wrong — one tap takes you back to that part of the lecture.
Paste a playlist, take a checkpoint, and revise from My tests — the whole flow, start to finish.
Revise what you missed — not everything. Paste the lectures you studied from, take the checkpoints, and let My tests show you exactly which parts to rewatch.
Watch anything. Remember it. Whatever you’re teaching yourself, a quick checkpoint after each part makes it stick.
Paste a playlist and take your first checkpoint in minutes.
