Hi HN,

  I built a grade calculator that runs entirely in your browser with no sign-up or data collection.                     
                                                                                                                        
  Key features:                                                                                                         
  - Real-time weighted grade calculation with automatic normalization                                                   
  - What-If simulator: calculate what score you need on finals to hit your target grade                                 
  - Multi-course support with localStorage persistence                                                                  
  - Grade breakdown charts                                                                                              
  - Dark mode                                                                                                           
                                                                                                                        
  Tech stack: Next.js 14, TypeScript, Zustand, Recharts. Fully open source (MIT).                                       
                                                                                                                        
  Built this because existing grade calculators either require accounts, show ads, or have clunky UX. Wanted something fast and privacy-respecting.                                                                                             
                                                                                                                        
  Live: https://ezgrade.me                                                                                                                                                                                       
                                                                                                                        
  Would love feedback on the UX and any features you'd find useful!