Guides, architecture deep dives, and learning science.
Switching the theme was louder than finishing the daily. We measured 35 sound effects, found off-key beeps, square waves, clicks and late timing, and rebuilt them all on plain Web Audio. Play every before and after.
A dead tap on /globe exposed what instant shells miss: one-shot dynamic imports, content that trails the shell, and medians that hide the tail. The fixes, with code.
How we dropped blocking server loads, idle-prefetch route chunks, pre-warm flag images, and lock instant navigations with a Playwright helper.
The algorithm that powers Learn mode: Again / Good / Easy, the real interval ladder, session mix, and how it differs from Anki's SM-2.