Duolingo
FreeThe world's most popular language-learning app. Daily lessons in 40+ languages with gamified exercises. Installable as a PWA with full offline lesson access.
How to install Duolingo as a PWA
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YouTube slow-downer for musicians. Paste a YouTube URL, loop any section, and adjust playback speed without pitch shift. Essential for learning songs by ear.
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Free world-class education in Math, Science, and Humanities. Thousands of lessons, exercises, and videos. A genuine replacement for expensive tutoring, installable as a PWA.