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Turn freeCodeCamp lessons into flashcards and quizzes

DeckOwl does not teach you to code, but it can turn freeCodeCamp lessons, slides and notes into flashcards and quizzes you can study with spaced repetition.

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Studying a freeCodeCamp project the smart way

Students working through a freeCodeCamp project to build a flashcard quiz app often have the lesson text open in one tab and the code in another, and the key terms slip away before the project is finished.

Turn freeCodeCamp lesson notes and PDFs into flashcards in minutes
Quiz yourself on JavaScript concepts before you code each feature
Review missed cards more often with spaced repetition
Export to Anki or CSV on the Plus plan

Example JavaScript concepts for a quiz app

What does Math.random() return?A floating-point number from 0 (inclusive) up to but not including 1.

What does JSON.parse() do?It converts a JSON string into a JavaScript value, such as an object or array.

What does localStorage.getItem('key') return when the key is missing?null, because no value has been stored under that key.

What does array.map() return?A new array of results from calling a function on each element, leaving the original array unchanged.

How do let and const differ?let allows reassignment, while const cannot be reassigned, although an object or array it holds can still be changed.

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Built from your own material

Upload a PDF, slide deck, text file or photo of a page and get flashcards and quiz questions written from that content.

Quizzes with explanations

Multiple choice, true/false and short answer questions include explanations so you learn why an answer is right.

Spaced repetition

Cards you miss come back sooner, and cards you know fade into longer review gaps.

How it works

Upload your lesson material

Add freeCodeCamp notes, a saved lesson PDF or screenshots of a page.

Generate flashcards and a quiz

DeckOwl creates cards and questions from the text it reads.

Study and review

Work through the cards in your browser and let spaced repetition set the review schedule.

DeckOwl does not write your app or replace the freeCodeCamp exercises. What it does is turn the concepts behind them, such as arrays, objects, events and storage, into cards and quizzes you can review between coding sessions.

For best results, upload the lesson notes you wrote yourself so the cards reflect how you understand the material.

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Turn PDFs, slides, notes and photos into spaced repetition flashcards. Free to start.

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Frequently asked questions

What JavaScript concepts should I review before building a quiz app?

Arrays, objects, functions, event listeners and how the DOM is updated cover most of a basic quiz app. Reviewing each one with a few short cards before you code the matching feature helps it stick.

How do I store flashcard data in a quiz app?

A common approach is an array of objects with question and answer fields, saved to localStorage so progress survives a page reload. Practicing this pattern with flashcards makes the project easier to follow.

Can I export my flashcards to Anki?

Yes, Anki and CSV export are included in the Plus plan at $39/year or $7.99/month. The free plan lets you study in the browser but does not include exports.

Is there a free plan, and do I need a credit card?

The free plan includes 3 generations per month with browser study. No credit card is needed to start, and students get 40% off with a school email.

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