What are some alternatives?
When comparing Raindrop.io and Refind, you can also consider the following products
Pocket - When you find something you want to view later, put it in Pocket.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Instapaper - Instapaper is a simple tool to save web pages for reading later.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
Nuzzel - Nuzzel is the super-easy way to see news from your friends.