YouTube Study Companion: Your Ultimate Video Learning Workstation
This extension transforms YouTube into an ultra-efficient learning and note-taking workstation. It integrates intuitive playback controls (play/pause, rewind/fast-forward, visual progress bar, speed adjustment) and powerful features designed for professional learners.
Cloud Sync Across Devices
Leverage sync technology to automatically synchronize all your video library records, marked notes, and loop settings across devices using your Google account. Your learning progress and highlights seamlessly transfer to any computer.
Smart Markers & A-B Loop
Add timestamped notes at any point in the video and save multiple study profiles for the same video (e.g., Music Appreciation / Practice / Tutorial). Frame-accurate A-B loop functionality lets you repeat specific segments infinitely.
Ultimate Keyboard Shortcuts
Designed for power users who keep their hands on the keyboard, core shortcuts cover play/pause, instant marker creation, and complete A-B loop setup. Paired with an independent floating window mode for seamless multitasking control.
Interface Overview
After launching the Extension, you'll see the main interface. The sidebar is cleanly designed with three main tabs:
1
Player (Playback Controls)
The main operation area. Now includes two internal sub-tabs: Markers for note-taking and browsing timestamps; Controls for adjusting playback speed and A-B loop settings.
2
Library (Video Library)
View all saved profiles for videos in your history.
3
Favorites (My Favorites)
Quick access to profiles you've marked as starred/default.
🟢 Status Indicator: Green indicates successful connection to the current YouTube video; gray indicates no video detected or standby mode.
➗ Arrow Button: Click to pop out the window independently.
Player & Marker Features
In the Player tab, you can manage video playback and use smart marker features. This tab contains two main functional areas:
01
Core Playback Controls (Player)
At the top of the player tab, you have complete control over video playback. Video Status shows the currently detected video title; if no video is detected, click Auto Detect (🪄) to re-detect.
- Transport Controls: Restart returns to the beginning; -10s / +10s quickly rewind or fast-forward 10 seconds; large central play/pause button.
- Playback Speed: Drag the slider from 0.25x to 3.0x for fine adjustment, or use quick buttons (0.5x, 1.0x, 1.5x, 2.0x).
- A-B Loop: Set start point (A) and end point (B); when enabled, the video repeats infinitely between A and B.
02
Smart Marker System (Markers)
The marker feature lets you take notes on the video timeline and jump back anytime. Click + Add "Now" to create a marker at the current timestamp. Use the dropdown menu to select categories (e.g., Default, Study) to organize different types of notes.
Video Library & Favorites
Manage Your Learning Data
The Library tab lists all saved video profiles, letting you quickly review your past learning records. The Favorites tab displays profiles you've marked as starred, for convenient immediate access to important content.
All data automatically syncs through your Google account, ensuring seamless switching between devices and never losing your learning progress.
Export/Import All
Export/import your complete learning database
Used Storage
Display cloud sync storage space used
Import Video
Import configuration data for a single video
Powerful Keyboard Shortcuts
Supports an extensive keyboard shortcut system that lets you control playback and learning completely without lifting your hands from the keyboard. Click the keyboard icon (⌨️) in the title bar to toggle the on-screen shortcut guide.
Basic Controls
- Space / K: Play / Pause
- J / L: Rewind / Fast-forward (10 seconds)
- , / .: Frame back / forward (when paused)
- 0-9: Jump to video percentage position
Advanced Loop
- [ : Set point A
- ] : Set point B
- { (Shift+[): Jump to start point A
- } (Shift+]): Toggle A-B loop
Markers & Navigation
- A: Add marker at current time
- S: Toggle "Follow Playback" mode
- ↑ / ↓: Navigate between markers sequentially (auto-jump and disable follow mode)