Black PWA
FreeThe simplest Progressive Web App ever? It's just a black window / screen, but it can be used to test PWA support on any browser and platform. Other uses?
How to install Black PWA as a PWA
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Spaced repetition flashcard app that works offline. Create decks with Markdown support, use the SuperMemo SM-2 algorithm for optimal memory retention. Data stored locally.
Open-source grammar and style checker for 20+ languages. The privacy-respecting Grammarly alternative with a browser extension and web app. Your text isn't used for AI training.
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.
Advanced word finder and anagram solver. Find words by pattern, letters, length, and crossword constraints. Used by Scrabble players and crossword enthusiasts.
Convert text to International Phonetic Alphabet (IPA) transcription. Supports English, French, German, Spanish. Essential for language learners and linguistics students.
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.