Formatting Cards back to the top

Flashcards by c13u supports LaTeX, Markdown and syntax highlighting.

You type: After saving the card, you'll see:
\(y = \frac{x^2}{\sqrt{2}} \) \(y = \frac{x^2}{\sqrt{2}}\)
* Asterisks denote bullets. ~~Strikethrough~~, **bold**, *italics*
  • Asterisks denote bullets. Strikethrough, bold, italics
  •                                         ```python
    def hello_world():
    print("Hello, World!")
                                            def hello_world():
    print("Hello, World!")
                                            What happens under the hood when a C 
    program is being compiled?

    * The C code is translated to assembly.
    * The compiler checks that calls of functions
    match the declarations that were inserted in the
    pre-processing stage.
    Effect: The content that appears after the [spoiler] tag will be covered by a gray box. If you hover over or click on the gray box, the hidden text will appear. This is useful for quizzing yourself.

    To insert images, I suggest using Markdown. Specify the size of your image so that it renders well on the card. For now, Flashcards by c13u doesn't host any images. Use image hosting sites such as Imgur and then paste the hyperlink to your flashcard. For example,

    ![bayes]( =60%x80%)

    renders this image (the dimensions have the format WIDTH x HEIGHT):


    The Tagging and Urgency System back to the top

    Flashcards by c13u categorizes the cards using the tags provided. When displaying a set of cards, the cards with higher urgency values are shown first.

    Tags are case-sensitive. When adding tags to a card, Flashcards by c13u offers an auto-complete feature in order to reduce the number of near-duplicate tags like [sorting_algorithms, sorting-algorithms, Sorting Algorithms].

    The importance of a tag is the sum of all the urgencies of the cards that bear that tag. For instance, suppose we have this set of cards:

    Card IDUrgencyTags
    card_12.0a, b
    card_26.0b, c

    Tag 'b' will have an importance of 2.0 + 6.0 = 8.0. It will therefore appear first in the list of tags as #b (2). The 2 means that you have 2 cards that have 'b' as one of their tags. The hashtag is prepended because it's the conventional way of writing a tag.

    Urgency Bars back to the top

    The 4 urgency bars give you an idea of where the urgencies of the selected cards lie. Suppose you've chosen to review cards that have the tags #medium_programming_challenges and/or #dynamic_programming.

    Suppose there are 12 such cards and their urgencies are [3, 3, 3, 4, 6, 6, 7, 8, 8, 8, 8, 9]. The urgencies of the 3rd, 6th, 9th and 12th cards are 3, 6, 8 and 9 respectively. The urgency bars will therefore be:

    The bars also show you how you're using the provided range. For instance, if the urgency bars are like this...

    ... a few conclusions can be made:
    • The most urgent card in this set has an urgency value of about 4.0
    • There's not much separation in the urgency values of the upper half of the cards

    The urgency bars should guide you when setting the urgency of any given card. If the bars are cramped together, you might want to space out the urgency values of those cards.

    Review Mode back to the top

    Normally, reviewing a set of cards works like this:

    1. Adjust the urgency of a card based on how confident you feel about its contents
    2. Click on the 'Save' button to store the changes
    3. Click on 'Next' to load the next card from the queue
    If review mode is active, Flashcards by c13u makes the review process more convenient by pressing the 'Save' and 'Next' buttons on your behalf.

    Public vs. Private Cards back to the top

    A private flashcard is only visible to you. It will not appear in the search results at

    In contrast, a public card will appear in the search results as a read-only card. Any user that wishes to add the card to their own collection will get a separate copy of the card.

    By default, your cards are private. provides an option for setting the default from that point in time onwards.

    Please share your cards in order to benefit other users. Each card has a shareable link that you can send to others. Note that if the card is set to 'private', the link won't work.

    As a general guideline, the cards should have relevant titles and clear language. Where possible, credit your sources. If any of the cards in are inappropriate or duplicates, please flag them as so.