@ner3y Have you tried Omnivore? I've been using it to replace Readwise and Matter, both paid solutions, exactly because I find them to be very pricey for me. Omnivore, on the other hand, is completely free, can be used from the web, from iOS or Android. And, although I haven't tried it myself, it seems that someone developed a third party app able to sync data between Omnivore and Kindle (see here and here).