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Uxie offers multiple specialized reading modes designed to improve your reading experience. Each mode is optimized for different reading goals and preferences.

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Available Reading Modes

Bionic Reading

Enhanced text readability with bold emphasis on key word parts

RSVP Reader

Speed reading with word-by-word display at adjustable speeds

Read-Along

Sentence-by-sentence highlighting with text-to-speech

Speak-Along

Practice pronunciation with voice recognition and mic input

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Bionic Reading Mode

Bionic reading enhances text readability by bolding the first few characters of each word, helping your eyes guide through text more efficiently.

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How to Enable

  1. Click the Settings icon in the PDF toolbar (bottom of screen)
  2. Toggle Bionic reading (BETA)
  3. The effect applies immediately to all text in the PDF
If the bionic text overlaps with regular text, try increasing the zoom level using the zoom controls in the toolbar.

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When to Use

  • Reading long documents or research papers
  • When you need to maintain focus for extended periods
  • Processing dense technical content
  • Reducing eye strain during long reading sessions
Bionic reading works best at zoom levels of 125% or higher. Experiment to find your optimal reading size.

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RSVP (Rapid Serial Visual Presentation)

RSVP mode displays one word at a time in the center of your screen, allowing you to read at speeds up to 500 words per minute.

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Activation

1

Open Settings

Click the Settings icon in the PDF toolbar
2

Enable Speed Read

Toggle the “Speed Read” option
3

Start Reading

Press Play or hit Space to begin

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Controls

The RSVP reader uses Optimal Recognition Point (ORP) technology, which highlights the key letter in each word for faster recognition.
ActionShortcut
Play / PauseSpace
Previous word←
Next word→
Increase speed↑
Decrease speed↓
Follow alongF
CloseEsc

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Follow-Along Feature

Enable Follow along to have the PDF automatically scroll to show the current word’s context in the document. This helps maintain spatial awareness while speed reading. 
// Example: ORP (Optimal Recognition Point) calculation
const ORP_TABLE = [0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3];

export function getOrpIndex(word: string): number {
  const len = word.length;
  if (len > 13) return 4;
  return ORP_TABLE[len] ?? 0;
}

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When to Use RSVP

  • Reviewing familiar material quickly
  • Getting through large volumes of text
  • Improving reading speed over time
  • Focus training exercises
RSVP mode is not recommended for complex technical material that requires frequent re-reading or deep comprehension.

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Read-Along Mode

Read-along mode combines visual highlighting with text-to-speech, reading the document aloud while highlighting the current sentence.

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Starting Read-Along

  1. Click the Play button in the bottom toolbar
  2. Choose your preferred reading speed (0.5x - 2.0x)
  3. The document will begin reading automatically

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Text-to-Speech Options

Uxie supports multiple TTS engines with different voice options:
Fast, lower qualityUses your browser’s built-in text-to-speech engine. Works offline and starts instantly.Available voices vary by browser and operating system.

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Reading Controls

  • Play/Pause - Space bar or toolbar button
  • Stop - Stops reading and returns to start
  • Skip Forward - Right arrow (→) to skip to next sentence
  • Skip Back - Left arrow (←) to go to previous sentence
  • Speed - Click speed button to cycle through speeds
When enabled, the PDF automatically scrolls to keep the currently read sentence visible.Toggle by clicking the eye icon or pressing F.

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Selecting Text to Read

You can start reading from any point in the document:
  1. Select text with your mouse
  2. Right-click and choose “Read from here”
  3. Or use the read-along context menu

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When to Use Read-Along

  • Learning new material while multitasking
  • Improving pronunciation of technical terms
  • Reducing eye strain during long study sessions
  • Accessibility support
  • Language learning

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Speak-Along Mode (Beta)

Speak-along mode helps you practice pronunciation by reading along with your microphone. The app listens to your voice and advances when you correctly say each word.

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Getting Started

1

Enable Microphone

Open Settings and toggle “Speak along (BETA)”
2

Grant Permissions

Allow microphone access when prompted by your browser
3

Start Speaking

Press the microphone button and start reading aloud

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Features

Voice Recognition

Automatically detects when you say each word correctly

Word Definitions

Click the info icon to see definitions and pronunciation

Hear Pronunciation

Press Enter to hear the correct pronunciation

Manual Navigation

Skip forward/back if recognition is inaccurate

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Keyboard Shortcuts

ActionShortcut
Toggle microphoneSpace
Previous word←
Next word→
Hear pronunciationEnter
StopEsc

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Transcript History

Speak-along shows a transcript of recently recognized words, helping you track your progress and verify accurate recognition.
speak-along.tsx
// Speak-along uses browser's Speech Recognition API
const SPEAK_ALONG_STATUS = {
  IDLE: "Not active",
  LISTENING: "Actively listening",
  PAUSED: "Paused",
  UNSUPPORTED: "Browser doesn't support speech recognition",
  ERROR: "Error occurred"
};

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When to Use Speak-Along

  • Language learning and pronunciation practice
  • Reading comprehension exercises
  • Speech therapy or accent reduction
  • Engaging with material actively rather than passively
  • Building reading fluency
Speak-along requires a quiet environment for best results. Background noise may affect word recognition accuracy.

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Switching Between Modes

All reading modes can be accessed from the Settings menu in the PDF toolbar. You can switch modes at any time without losing your place in the document.

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Best Practices

Speed Reading: Start with RSVP mode at 200 WPM and gradually increase as you get comfortable.Comprehension: Use read-along mode with follow-along enabled for complex material.Focus: Bionic reading helps maintain attention during long documents.Practice: Speak-along is ideal for pronunciation practice and active engagement.

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Reading Mode Comparison

ModeSpeedComprehensionActive EngagementBest For
Bionic ReadingNormalHighLowLong-form reading
RSVPVery HighMediumLowQuick review
Read-AlongAdjustableHighLowMultitasking
Speak-AlongSlowVery HighVery HighLanguage learning

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Troubleshooting

The text display uses a monospace font for optimal alignment. Try adjusting your browser zoom (Ctrl/Cmd + Plus/Minus) for clearer rendering.
If using Kokoro or Supertonic voices:
  1. Wait 30 seconds for the model to download on first use
  2. Check your internet connection
  3. Try switching to Browser TTS as a fallback
  • Ensure your microphone is working and has browser permissions
  • Speak clearly and at a moderate pace
  • Use the manual controls (arrow keys) to skip problematic words
  • Try in a quieter environment
This is normal - the feature ensures the highlighted text stays visible. You can disable follow-along by pressing F or clicking the eye icon.

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