LoopLens

A small desktop app that steps through a for loop so you can see the classic shape:

for (  start once  ;  check  ;  step  )
              int i = 0 ;  i < 3 ;  i++
         { body }

One focus at a time: the active slot lights up, squares show where i is, and a single sentence explains the moment.

• C++ — for (int i = 0; i < 3; i++)
• Python — for i in range(3) (same squares; “next” instead of i++)

flutter pub get
flutter run -d linux    # or macos / windows

Controls: ← → or A D step (pauses autoplay) · Space play/pause · R reset

MIT