Hi, I’m Vidi! Ready for one problem?
Master hard subjects — a little every day.
Hours re-reading notes, then blanking on the exam? Vidi turns each subject into interactive problems and spaced reviews, planned around your exam date.
No account, no card — runs in your browser.
Walkthrough video coming soon.
Three steps to exam-ready
Pick your subject
Choose a course and work through it chapter by chapter, lesson by lesson.
Solve, don’t re-read
Auto-graded problems that explain the why. Stuck? Graded hints nudge you to the next step.
Why it works: retrieval practice
Remember it on exam day
Your reviews are scheduled right before you’d forget — around your exam date.
Why it works: spaced repetition
What you can study today
Mathematics
Linear Algebra & Probability
10 modules · 72 lessons
Linear algebra (vectors, elimination, eigenstructure, orthogonality, SVD) and probability (foundations, random variables, expectation, the CLT, joint distributions).
Physics
Classical Mechanics
1 module · 4 lessons
Pilot course: kinematics, Newton's laws, energy and momentum.
ChemistryComing soon
Stoichiometry, atomic structure, bonding, thermochemistry and equilibrium — the next subject on its way to Vidi.
All you need to actually learn it
Learn
Theory, worked examples and visualizations.
Practice
Auto-graded problems that explain the why — mixed across chapters.
Timed exams
Mock exams against the clock, by chapter.
Study plan
A daily plan built around your exam date.
Spaced review
Flashcards that return before you forget.
Tutor
Hints toward the next step, not the answer.
Questions, answered
Do I need an account to try it?
No. The demo lesson runs in your browser and nothing is saved. You can also use the app as a guest, with no sign-up. Create a free account to carry your progress across devices.
Is Vidi free?
Right now Vidi is an open pilot: everything is free and no card is needed. Paid plans are planned — see Pricing for the intended prices.
Which subjects can I study?
Right now you can study Linear Algebra & Probability and Classical Mechanics. Chemistry is coming soon.
Does Vidi just give me the answers?
No. The tutor guides you step by step with hints, so you do the solving — that’s what sticks on exam day.
Try a lesson now — no sign-up
Create a free account when you want your progress to follow you across devices.