Upload a lecture and get a 15-minute spoken Lesson on it, built on your own slides and notes.
Sodium-potassium pump · Cell Biology
12:24 left
End Lesson
2 of 4 · Why the pump costs energy
Your turn
That is exactly it. One ATP every cycle, three sodium out for two potassium in. Your Lecture 4 slides have the ratio on page 19.
YouSo the inside ends up negative.
Good. That difference is the membrane potential. Say that back to me.
1
Slides, a PDF, a Word file, Markdown notes, a YouTube video or a web page, up to 50 MB.
2
It finds the topics in it and keeps every page, section and timestamp. Most lectures are ready in a minute or two; a whole textbook takes longer.
3
Fifteen minutes, spoken, on one topic. Ask questions out loud, and ask for a drawing when a picture would help.
Every part of it works from the files and links you add.
The tutor builds each idea up from the basics and ties it back to what your slides and notes say. Interrupt any time, or ask it to explain something a different way.
More about Voice LessonsFirst-pass metabolism · Pharmacology
12:07 left
End
3 of 5 · Why the oral dose is larger
Listening
A tablet has to go through the gut wall and then straight through the liver before any of it reaches the rest of you. The liver takes a cut on the way past, and what is left is the bioavailable fraction.
YouSo an injection skips all of that?
It does. Straight into the blood, nothing taken off, which is why the oral dose of the same drug is the larger of the two.
When a curve or a diagram explains a concept faster than words, the tutor draws it beside the conversation, usually within a minute. Some drawings you can move and change, and they stay with the Lesson for when you come back.
More about Voice LessonsStandard deviation · Research Methods
8:41 left
End
Two classes can sit the same paper, average the same mark, and feel nothing alike. Widen the spread and watch what stays inside the band.
Same average, different spread
Drag the spread. About 68% of the class is always inside one deviation.
Pick a quiz type (multiple choice, fill in the blank, true or false, or mixed) and answer 5, 10 or 15 questions from your own slides and notes.
More about Quick QuizQuestion 4 of 10
Quick Quiz
Leave
A firm in perfect competition is producing where marginal cost is above marginal revenue. What should it do?
aRaise its priceYou
It cannot. A price taker sells at the market price or sells nothing.
bReduce output
Each extra unit is costing more than it earns, so the last ones are losing money.
cLeave the market
Profit is at its highest where marginal cost equals marginal revenue. Above it, cutting output raises profit.
Today picks a few concepts and says why each one is there: a review is due, you got it wrong twice recently, or your exam is close. It's spaced repetition without a timetable to keep.
More about TodayToday · Biochemistry
3 worth a look
Krebs cycle regulation
LearningThis one has caught you out a few times recently.
Enzyme inhibition
Review dueIt's been 12 days since you last worked with this.
Glycolysis: the rate-limiting steps
NewNew. Nothing worked through on it yet.
Today says what deserves attention. You choose Lesson, Quiz, Flashcards or Sources.
I’m the founder of SymbioLearn.
It started as my final-year university project in 2023. The first version was basically: upload a PDF and talk to it.
A lot has changed since then, but the problem I’ve kept coming back to is the same one: getting an answer is easy. Being able to explain the idea, remember it later and use it when the question changes is harder.
That’s what SymbioLearn is built around now.
One plan. The first 3 days are free.
Pro
$19 / month
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First 3 days free, then $19
You add a card at the start. The trial has 30 Lesson minutes; cancel before it ends and you pay nothing.
Your study material, whether that is a PDF, a Word or PowerPoint file, Markdown notes, a web page or a YouTube video. Past papers go in too, to practise on. A file can be up to 50 MB and 1000 pages or slides, a video up to 4 hours, and you can add up to 20 an hour. Each one keeps its page numbers, slides, headings or timestamps, so a quiz answer or a flashcard can be traced back to where it came from.
It starts from what you put in. Quiz questions, flashcards and corrections are written from passages in your own material and show which passage, so you can open it and check. In a Lesson the tutor explains in its own words and brings in examples, then ties each idea back to your pages.
Pro starts with 3 days free. You add a card when you start, and nothing is charged until the trial ends; cancel before then from your account and you pay nothing. The trial has every part of Pro and 30 Voice Lesson minutes, which is two full Lessons, and you get an email the day before the first payment.
Minutes count by the second while the conversation is connected. When they run out, Lessons stop starting; concepts, quizzes, flashcards and Today carry on. Top-ups are 60 minutes for $5 or 180 for $12, they do not expire, and included minutes are spent first.
Yes, from your account, whenever you want. Pro runs to the end of the period you paid for. After that your modules, sources and history stay where they are, and studying with them needs Pro again.
They go into private storage only your account can reach, and stay there to open as Sources or download as the file you uploaded. SymbioLearn extracts the text to find the concepts in it. Your material is not used to train models, and it is not used to answer anyone else's question. Deleting a Source removes the file and its text; deleting a module removes everything in it.
Most lectures are ready for a Lesson in a minute or two.
3-day free trial, then $19 a month · Cancel anytime
