Save & review highlights from Kindle & Web pages

Booxia helps with learning and remembering, by using science-proven methods: spaced repetition, active recalls & cloze deletion tests. You can easily clip paragraphs or entire pages from the web using a browser extension, or import your Kindle highlights.
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I've built after having this need myself -- forgetting what I discovered in books & articles. While building I also learned about 2 more projects doing this, but without any free tier. Would love to hear your feedback!