Spaced Repetition
Readwise-style daily review for highlight retention
Spaced Repetition
Review your highlights daily with scientifically-proven spaced repetition algorithms. Never forget what you read.
Overview
Naidis includes a complete spaced repetition system inspired by Readwise's Daily Review. It supports:
- Highlight Review: Revisit your book/article highlights at optimal intervals
- Mastery Cards: Create Q&A and cloze deletion flashcards from highlights
- Streak Tracking: Build a daily review habit with streak stats
- Two Algorithms: Choose between SM-2 (SuperMemo) and Half-life Decay
Quick Start
- Open the Command Palette with
Cmd+Shift+P - Select "Daily Review" or press
Cmd+Shift+R - Review your highlights and mastery cards
- Build your streak!
Daily Review Flow
Highlight Actions
When reviewing a highlight, you can:
| Action | Shortcut | Effect |
|---|---|---|
| Keep | Enter | Mark as reviewed, schedule next review |
| Discard | D | Remove from future reviews |
| Master | M | Create a Q&A or Cloze card |
| Add Note | N | Add a personal note |
| Add Tag | T | Tag the highlight |
Mastery Card Actions
For Q&A and Cloze cards:
| Action | Shortcut | Effect |
|---|---|---|
| Show Answer | Space | Reveal the answer |
| Soon | 1 | Review again soon (forgot) |
| Later | 2 | Review later (remembered with effort) |
| Someday | 3 | Review much later (easy recall) |
| Never | 0 | Remove from reviews |
Navigation
←Previous item→Next item
Algorithms
SM-2 (SuperMemo)
The classic spaced repetition algorithm used by Anki and SuperMemo. Proven effective over decades.
- Predictable intervals: 1 day → 6 days → 15 days → etc.
- Adjusts based on recall quality
- Best for: Consistent, predictable review schedules
Half-life Decay
A newer, adaptive algorithm that models memory as exponential decay.
- Calculates recall probability in real-time
- Adapts faster to individual learning patterns
- Best for: Adaptive scheduling, variable study patterns
Mastery Cards
Turn highlights into flashcards for deeper retention.
Q&A Cards
Create question-answer pairs from your highlights:
Highlight: "The mitochondria is the powerhouse of the cell"
Question: What is the powerhouse of the cell?
Answer: The mitochondriaCloze Deletions
Hide parts of text to test recall:
Original: The mitochondria is the powerhouse of the cell
Cloze: The {{mitochondria}} is the powerhouse of the cell
During review: The [...] is the powerhouse of the cellUse {{...}} syntax to mark hidden text.
Statistics
View your review statistics:
- Current Streak: Consecutive days reviewed
- Longest Streak: Your personal best
- Today/Week/Total: Review counts
- Streak Recovery: Miss a day? You can recover within 24 hours
Access stats via Command Palette → "View Statistics"
Settings
Configure in Settings → Review tab:
| Setting | Default | Description |
|---|---|---|
| Algorithm | SM-2 | Choose SM-2 or Half-life Decay |
| Highlights per day | 15 | Max highlights to review daily |
| Mastery cards per day | 10 | Max cards to review daily |
Frequency Tuning
Adjust review frequency per document or source type:
- Documents: Review some books more/less frequently
- Source Types: Prioritize articles over tweets, etc.
Frequency multiplier: 0.5x (half as often) to 2.0x (twice as often)
Comparison with Readwise
| Feature | Readwise | Naidis |
|---|---|---|
| Daily Review | ✅ | ✅ |
| Highlight Surfacing | ✅ | ✅ |
| Mastery Cards (Q&A) | ✅ | ✅ |
| Cloze Deletions | ✅ | ✅ |
| Streak Tracking | ✅ | ✅ |
| Algorithm Choice | ❌ (proprietary) | ✅ (SM-2 or Half-life) |
| Frequency Tuning | ✅ | ✅ |
| Local-first | ❌ (cloud) | ✅ |
| One-time Payment | ❌ ($9.99/mo) | ✅ ($29) |
Tips
- Start small: Begin with 10-15 highlights per day
- Be consistent: Short daily sessions beat long irregular ones
- Use Mastery for key facts: Not every highlight needs a flashcard
- Discard liberally: Remove highlights that no longer matter
- Check stats weekly: Celebrate your streak!