---
title: "Cards and decks"
description: "The card types Armin supports, and how decks hold cards and their links."
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.armincards.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Cards and decks

A **deck** is a named set of cards. Prerequisite links connect cards within
one deck, so keep cards that build on each other together.

A **card** is what you write. When you study, Armin shows you its **review
units**: a Basic card has one, a reversed card has two (one per direction), and
a cloze card has one per deletion. Each review unit is scheduled on its own.

## Card types

| Type               | What you write                                       | What you review                                          |
| ------------------ | ---------------------------------------------------- | -------------------------------------------------------- |
| Basic              | A front and a back.                                  | The front; recall the back.                              |
| Basic and reversed | A front and a back.                                  | Both directions, scheduled separately.                   |
| Cloze              | Text with hidden parts, such as `{{mitochondria}}`.  | The text with one deletion hidden at a time.             |
| Type the answer    | A prompt, an answer, and any other accepted answers. | The prompt; type the answer and Armin checks it.         |
| Image occlusion    | An image with masked regions.                        | The image with one region hidden at a time.              |
| Concept            | A brief and one worked example.                      | A new exercise from the concept each time. Requires Pro. |

## Cloze deletions

Wrap each part to hide in double braces. Every deletion becomes its own review
unit unless you number them: deletions with the same number are hidden
together.

```text
The {{1::mitochondria}} is the {{2::powerhouse}} of the {{2::cell}}.
```

This card has two review units: one hides "mitochondria", the other hides
"powerhouse" and "cell" together. Add a hint after a second `::`, as in
`{{1::mitochondria::organelle}}`.

## Concept cards

A concept card practises a skill rather than a fact. You describe the concept
and give one worked example, and Armin generates a pool of exercises from it.
Each review shows a different exercise, while the schedule tracks the concept
as one card. You can edit, flag, or delete exercises you don't want.

Concept cards need a Pro plan. See [Plans and limits](https://docs.armincards.app/reference/plans/).

## Images and audio

Cards can include images and audio. Armin shrinks images and compresses audio
in your browser before upload, and stores them privately in your library.

Source: https://docs.armincards.app/guides/cards-and-decks/index.mdx