The best alternatives to Riffle are Readingstash, Booknshelf, and Shelf Joy. If these 3 options don't work for you, we've listed a few more alternatives below.
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Sigma - See the Next Generation of Analytics— AI, Data Apps, Python - Attend the launch!
MyLibretto is an app that helps any student manage their university career. Your academic transcript, your university, your career trend, your average, class schedule, fees, exams to do, questions, widget, them...