Codecell: Python & JS Tracer

Most code apps stop at "press run, read the output". Codecell starts there and then shows you what your program actually did, one line at a time. ONE LIBRARY, TWO LANGUAGES A script is Python or JavaScript, and both sit in the same library. The same tracer, the same variables inspector, the same REPL and the same assistant work on either one. There is no mode to switch and no second app to buy. REPLAY ANY RUN, WITH BREAKPOINTS Press Trace instead of Run and Codecell records the program as it executes: every line, every call and return, and the value of every variable at each step. Scrub back and forth, play it like a video, and watch a loop go wrong at the exact moment it does. Tap a line number to set a breakpoint; playback runs to it and stops, and Continue jumps to the next one. This is the pen-and-paper trace a teacher draws on a whiteboard, done by the interpreter itself. SEE THE…