VocaSub

About

Learn languages while watching anime — the natural way.                                                                                                                                                                                  
                                                                                                                                                                                                                                           
  VocaSub adds a second subtitle track to the video player on anizium.co, so you can read both the original language and your native language at the same time. No flashcards, no textbooks — just watch and absorb.                       
                                                                                                                                                                                                                                           
  How it works                                                                                                                                                                                                                             
  Pick any two available subtitle languages. The primary subtitle plays normally on top; VocaSub places your secondary subtitle just below it, perfectly synced frame-by-frame.
                                                                                                                                                                                                                                           
  Blur Mode — Active Recall While Watching                                                                                                                                                                                                 
  The secondary subtitle appears blurred by default. Try to understand the sentence from the primary language first, then reveal the translation by hovering over it or pressing E. Each new subtitle line re-blurs automatically, keeping 
  you engaged without pausing the video.                                                                                                                                                                                                   
                                                            
  Focus Mode (F)                                                                                                                                                                                                                           
  Enter a distraction-free fullscreen experience. All player controls disappear. The cursor auto-hides after 3 seconds of inactivity. Just you, the anime, and the subtitles.
                                                                                                                                                                                                                                           
  Tablet Mode
  Designed for touch devices. On-screen buttons replace keyboard shortcuts:                                                                                                                                                                
  - Tap A / D to jump to the previous or next subtitle                                                                                                                                                                                     
  - Tap S to repeat the current line                                                                                                                                                                                                       
  - Tap E to reveal the blurred subtitle                                                                                                                                                                                                   
  - Long-press the left half of the screen to slow down to 0.5x speed                                                                                                                                                                      
  - Long-press the right half to speed up to 2.0x                                                                                                                                                                                          
  - Release to return to normal speed instantly  
  - Button placement is configurable (left or right side)                                                                                                                                                                                  
                                                            
  Keyboard Shortcuts                                                                                                                                                                                                                       
  - E — Reveal blurred subtitle                             
  - A — Jump to previous subtitle                                                                                                                                                                                                          
  - S — Repeat current subtitle                             
  - D — Jump to next subtitle  
  - F — Enter Focus Mode                                                                                                                                                                                                                   
  - L — Toggle extension on/off
  - Space — Play/Pause (in Focus & Tablet modes)                                                                                                                                                                                           
                                                            
  Subtitle Navigation                                                                                                                                                                                                                      
  Jump between subtitle cues with A/S/D keys. The video seeks directly to the start of each subtitle line — perfect for replaying a sentence you didn't catch.
                                                                                                                                                                                                                                           
  Privacy First                                             
  VocaSub collects zero user data. No analytics, no tracking, no external servers. Your language preferences are saved locally in your browser and never leave your device.                                                                
                                                                                                                                                                                                                                           
  Features at a glance:
  - Dual subtitle display with frame-perfect sync                                                                                                                                                                                          
  - Blur mode for active language recall                                                                                                                                                                                                   
  - Focus mode for immersive, distraction-free viewing
  - Tablet mode with on-screen controls and touch speed gestures                                                                                                                                                                           
  - Keyboard shortcuts for fast subtitle navigation             
  - Works exclusively on anizium.co for now                                                                                                                                                                                                        
  - Lightweight, fast, and privacy-focused