Nightspar is a vocabulary app for people who meet new words in real reading and want to keep them. Select a word or a whole phrase and save it. Nightspar keeps the sentence around it and builds a complete flashcard for the meaning used there. Each card has translations, pronunciation, example sentences and audio, and you never make one by hand.
Reviews are scheduled with FSRS, the same modern algorithm Anki uses. It takes a few minutes a day. Each word comes back right before you would forget it, and on the back of the card a short animated scene acts the word out.
There are several ways to add words. The browser extension for Chrome and Firefox saves a phrase from any page without leaving it. The web app works on phones too and can be added to the home screen. A built-in MCP server lets ChatGPT, Claude and other assistants save words to your library in the middle of a conversation. AI import takes a pasted list or a whole article and picks the words worth learning.
Smart collections group your phrases from a plain description such as "work vocabulary" and keep themselves updated as your library grows. Nightspar supports 34 languages, and you can learn several at once, each with its own library and review schedule.
Free during the beta. Your phrases can be exported as a CSV file at any time, on every plan.
Nightspar 
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