The AI study platform
to outsmart your brain
Turn notes and imported files into cards that test you, and web topics into curated learning paths.
Your notes are the deck
Write **Vocab:** and **Def:** around a term, ten times, and the note turns into cards that look like this.
Already have something to study?
The search above is for when you do not. If you already have a class, a book, or your own notes, you can skip it entirely.
You have a class, a book, or notes
Just start studying
Skip the search. Open a note and write, paste, or upload what you are studying. Once ten **Vocab:** pairs are in it, the note becomes a deck.
Open a noteWhy it is built this way
Retrieval beats rereading
Rereading feels fluent and predicts almost nothing. Producing the answer from memory is what leaves a trace.
Roediger & Karpicke, 2006Spacing beats massing
The same minutes spread across days outperform the same minutes in one sitting, and the advantage grows with the delay.
Cepeda et al., 2006Generation beats provision
A word you generate is remembered better than the same word handed to you. Write the answer yourself and it stays; the cards you author count toward progress, the imported ones do not until you re-explain them.
How it works
Find the material
Type in the subject. Quad Encode ranks the strongest material on the open web and orders it into a path. Free resources come first, each with a plain description of what it covers and who it is actually for.
See a real pathWrite it down, or bring it in
Take notes in the editor, or upload a PDF, a Word file, or a text file. Mark a term with **Vocab:** and **Def:** on two lines, or just type Term: definition on one.
Try the editorTen pairs makes a deck
Cards do not appear one at a time. A note turns into a deck once it holds ten vocab pairs, and editing back under ten takes those cards away again. Nothing else about the app works on a threshold, so this is the part worth knowing up front.
Why tenAnswer before you are told
Five cards come due at a time, a set every 12 hours. Answer each in your head, then reveal, which happens instantly so nothing lets your eye skim ahead. Right moves a card up a box. Wrong sends it back to one day, wherever it was. Showing up daily builds a streak and points, both counted from your real reviews.
See the boxesPractice costs you nothing
Flashcards, a shuffled quiz, a sixty second run, a board where you match terms to definitions, and one that puts two answers that read alike side by side. None of them write to the schedule, so you can drill a weak patch as often as you like without moving tomorrow out of place.
The practice modesTake notes beside the video
When a step in your path is a YouTube video, open it next to the editor. Capture timestamp drops a link into the note, and clicking that link later sends the player back to the second you were on.
How that worksOne way this goes
Paste Tuesday's biology notes into a new note. Ten vocab pairs turn it into a deck. Review takes a few minutes a day on the box schedule, and by Friday the cards you got right have moved up while the ones you missed have kept coming back.
Reading feels productive.
Every other tool will happily show you the answer. That is the moment the work stops. Quad Encode puts the prompt up on its own and waits, and the answer it shows you is the one you wrote when you understood it, not a stranger's.
Five ways to practice,
none of them graded.
Graded review runs on the box schedule and writes to it. These modes do not, so you can drill a weak patch as often as you like without moving what is due tomorrow.
Keep it on your home screen.
Quad Encode installs straight from the browser, with nothing to download from an app store. It opens in its own window instead of a tab, which makes a quick set something you can do while the kettle boils.
- 1Tap Share at the bottom of the screen
- 2Choose Add to Home Screen
- 1Open the three-dot menu
- 2Choose Install app
Needs a connection, the same as the site