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A flashcard practice app built from your own study material

Upload a PDF, a slide deck, typed notes or a photo of a page. DeckOwl makes flashcards you can review in spaced repetition sessions.

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How a flashcard practice app should fit your study routine

A flashcard practice app is only useful if the cards match what your course actually covers.

  • Free plan: 3 generations per month, studying in the browser
  • Plus ($39/year or $7.99/month): unlimited generations and PDF, DOCX, Anki and CSV export
  • Pro ($14.99/month): stronger AI model, bulk upload, QTI 2.1 and Moodle XML export
  • Students get 40% off with a school email, and no credit card is needed to start
Example renewable energy flashcards
What is the main energy source for solar photovoltaic panels?Sunlight. Photovoltaic cells convert photons directly into electricity using semiconductor materials.
How does a hydroelectric dam generate electricity?Falling water turns turbines connected to generators, so the height of stored water and the flow rate set the output.
Why is wind power intermittent?Wind speed changes by hour and season, so turbine output rises and falls unless storage or other sources cover the gaps.
What is geothermal energy?Heat drawn from the Earth's interior, used directly for heating or to drive turbines where hot rock or water is near the surface.
What does biomass energy use as fuel?Organic material such as wood, crop residue or waste, which is burned or converted into biogas or biofuel.
Generate the full set

Any source you already have

Upload PDF, DOCX, PPTX, plain text notes, or photos of pages. Photos are read with text recognition.

Spaced repetition

Cards you miss come back sooner, and cards you know move further apart.

Quizzes and mind maps too

Switch to multiple choice, true/false or short answer quizzes with explanations when flipping cards gets stale.

How it works

Upload your material

Drop in a PDF, slides, notes or an image.

Generate your cards

DeckOwl builds flashcards from the text it finds.

Practice on a schedule

Review each day and let spaced repetition set the next pass.

Most people make cards by hand, which takes time they would rather spend reviewing. Here the cards come from the lecture slides or chapter PDF you already have, so practice starts sooner.

Spaced repetition handles the scheduling. Cards you get wrong return within a session or two, while cards you know are pushed out to longer gaps.

Explore related topics

Frequently asked questions

How many flashcards should I make for a renewable energy unit?

Keep each set to one lecture or chapter, and focus on definitions, how each source works and its main trade-offs. Add more cards only after you see which terms you keep missing.

How should I study renewable energy terms with flashcards?

Write the term on the front and a plain explanation on the back, then say the answer aloud before flipping. Mix in questions that ask why a technology suits certain locations, not just what it is called.

Does DeckOwl work with my school's files?

DeckOwl accepts PDF, DOCX, PPTX, plain text and images of pages. Exporting cards to PDF, Anki or CSV requires the Plus plan.

Is there a free version?

Yes. The free plan includes 3 generations per month and studying in the browser. Exports require the Plus or Pro plan.

Generate free flashcards

Keep exploring the topic

Review the main ideas visually or practice recalling them.