What are some alternatives?
When comparing Raindrop and Raindrop.io, you can also consider the following products
Atavi - Your bookmarks are always close at hand!
Pocket - When you find something you want to view later, put it in Pocket.
Cumulus - A SoundCloud player that lives in your menubar.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Diigo - Diigo is a powerful research tool and a knowledge-sharing community