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Test a flashcard maker on your own notes, free

Upload a PDF, slides, notes or a photo of a page and judge the flashcards yourself before you commit. No credit card needed to start.

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Drop files here or browsePDF, DOCX, PPTX, text or photos of your notes · several files with Plus

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What to check when you test a flashcard maker

Testing a flashcard maker usually comes down to one question: does it pull the right facts out of my own material? Probability basics is a good test case because the definitions, complement rule and addition rule are short enough to check against your textbook in a few minutes.

Check that each card's answer matches your textbook or lecture notes.
Look for terms the generator may have split, merged or misread from slides.
Confirm that formulas and symbols came through correctly in the cards.
Study a few cards for a day to see whether the review schedule feels useful.

Example probability basics flashcards

What is the probability of an event in a situation with equally likely outcomes?The number of favorable outcomes divided by the total number of equally likely outcomes, a value from 0 to 1.

What is the complement rule?P(not A) = 1 - P(A), so the chance that an event does not occur is one minus the chance that it does.

When are two events independent?When P(A and B) = P(A) x P(B), meaning knowing one event occurred does not change the chance of the other.

What is the addition rule for two events that can both occur?P(A or B) = P(A) + P(B) - P(A and B), because subtracting the overlap avoids counting it twice.

What does a probability of 0 mean?The event is impossible. Probabilities range from 0 (impossible) to 1 (certain).

Generate the full set

Works with your material

Upload PDFs, DOCX and PPTX files, plain text notes, or photos of pages read with text recognition.

Spaced repetition built in

Flashcards are scheduled for review over time, so you see weak cards more often and strong ones less.

Study in the browser

The free plan lets you review cards right away in the browser, with no install and no exports needed to test it.

How it works

Upload a chapter or set of notes

Add a PDF, slide deck, text file or a photo of a page from the material you are actually studying.

Review the generated cards

Read through the flashcards and check whether the questions, terms and answers match what your course covers.

Decide whether to keep going

If the cards look accurate, study them with spaced repetition or move to Plus for unlimited generations and exports.

DeckOwl reads PDFs, DOCX and PPTX files, plain text notes, and photos of pages through text recognition. Upload one chapter, review the cards it produces, and edit anything that looks off before you start studying with spaced repetition.

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Frequently asked questions

How many flashcards should I make for probability basics?

Start with one card per definition and rule, plus a few cards for worked problems, then add more as topics get harder. Short decks you review every day tend to stick better than long decks you review rarely.

What is the difference between independent and mutually exclusive events?

Independent events do not change each other's probabilities, while mutually exclusive events cannot both happen at once. If both events have nonzero probability, they cannot be independent and mutually exclusive at the same time.

Can I export my flashcards to Anki?

Yes, but export is a paid feature: Plus includes PDF, DOCX, Anki and CSV export. The free plan lets you study in the browser without exports.

Does it work with photos of my notes?

Yes, photos of pages are read with text recognition, so you can upload a picture of printed or handwritten pages alongside your PDFs and slides.

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Keep exploring the topic

Review the main ideas visually or practice recalling them.