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Preview

Desktop and mobile · LaTeX math support · Learning analytics · Custom study sessions

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Why Lemma?

Most spaced repetition tools require leaving your knowledge base, exporting notes, and managing a secondary database. Lemma embeds spaced repetition directly in Markdown.

Notes are decks. Add #flashcards to any note, write cards in plain Markdown, and let FSRS handle scheduling.

Feature	Lemma	Anki	Standard SR Plugins
Native Markdown workflow	Yes	No	Yes
FSRS scheduling	Yes	Yes (addon)	Partial
Mobile support	Yes	Yes	Varies
LaTeX / rich Markdown	Yes	Yes	Varies
Cross-device sync (CouchDB)	Yes	Yes	No
Custom study sessions	Yes	Yes	No
Zero file clutter	Yes	N/A	Varies
Open source	Yes	Yes	Yes

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Features

FSRS Scheduling

Lemma uses FSRS (Free Spaced Repetition Scheduler), a modern scheduling algorithm developed from cognitive science research. It models memory stability and retrievability based on your individual recall patterns.

Cards Live in Notes

Write flashcards directly in any Markdown note without imports or app switching.

---card--- ^fsrs-abc123
What is the powerhouse of the cell?
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**Mitochondria** — produces ATP through cellular respiration.

Cloze Deletions

The ==c1::mitochondria== is the powerhouse of the ==c2::cell==.

Each cloze deletion is scheduled independently.

Dashboard View

View all decks in a single overview with due counts, new cards, and total reviewed.

Custom Study Sessions

Filter review queues by tag, card state (new, learning, due), or configure a card limit for targeted study and exam preparation.

Review Statistics

Analyze learning progress with retention curves, card maturity distribution, interval histograms, 30-day activity, and 7-day forecast charts.

Mobile Support

Responsive review interface designed for desktop and mobile, with safe-area insets and touch-optimized navigation.

Optional CouchDB Sync

Connect to self-hosted CouchDB or Cloudant instances to sync review history seamlessly across devices.

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Quick Start

1. Install from Community Plugins: search for Lemma.
2. Add #flashcards to any note's frontmatter or inline:

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tags: [flashcards]
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3. Write a card:

---card--- ^my-first-card
What is spaced repetition?
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A learning technique that schedules reviews at increasing intervals to maximize long-term retention.

4. Open the Lemma dashboard from the status bar or Command Palette (Open dashboard).

Full syntax documentation: FLASHCARD_GUIDE.md

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Card Formats

Basic Cards

---card--- ^unique-id
Front content (question)
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Back content (answer with **Markdown**, $LaTeX$, and images)

Single-Line Cards

Question::Answer ^single-001
Reversed Question:::Reversed Answer ^rev-001

Cloze Deletion Cards

The ==c1::Ebbinghaus== forgetting curve shows memory decays without ==c2::repetition==.

[!TIP] Add a ^block-id to any card so review history persists across content edits.

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Keyboard Shortcuts

Key	Action
Space / Enter	Reveal answer
1	Again
2	Hard
3	Good
4	Easy
Esc	Exit session

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Commands

Command	Description
Add a new flashcard	Insert a card template with a pre-generated block ID
Add a single-line card	Insert a single-line card template
Add a reversed card	Insert a bidirectional card template
Add a cloze card	Insert a cloze deletion template
Create cloze from selection	Wrap selected text in cloze syntax
Open dashboard	Open the Lemma deck overview
Sync now	Trigger a manual CouchDB sync
Check sync status	View sync connection status
Review due notes	Start whole-note review session
Reset all card progress	Reset all scheduling data

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Settings

Setting	Description
Deck tag	Tag identifying deck files (default: flashcards)
Max new cards/day	Daily limit on new card introductions
Max reviews/day	Daily limit on review cards
Review font size	Font size in the review modal
FSRS parameters	Algorithm weights and retention target configuration
PouchDB storage	IndexedDB storage engine for collections
Sync	CouchDB connection and credential settings

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Installation

Community Plugin Directory

1. Open Settings → Community plugins
2. Click Browse and search for Lemma
3. Select Install, then Enable

Manual Installation

1. Download main.js, manifest.json, and styles.css from the latest release
2. Copy the files into:

   <vault>/.obsidian/plugins/lemma-flashcards/
   

3. Reload Obsidian and enable the plugin under Settings → Community plugins

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Contributing

Contributions, bug reports, and feature requests are welcome.

• Issue tracker: GitHub issues
• Pull requests: Open a pull request against main

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License

ISC License — see LICENSE for details.