What are some alternatives?
When comparing Raindrop.io and Pinboard, 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.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
start.me - A Modern-day bookmark manager. A place for your favorites. A news feed (RSS) reader. A browser startpage. A portal for your team.
Google Bookmarks - With Google Bookmarks, you can save shortcuts to your favorite webpages and navigate to them in seconds from anywhere.
Papaly - Papaly is a simple social bookmarking tool to manage all your links.