Blockbuilder is changing
Almost 5 years after the kickstarter made Blockbuilder real, it's time to make a hard choice. Within the next couple of months Blockbuilder will become a searchable archive of blocks rather a live app where you can create them.
2020 is a lot different from 2015... to say the least. In-browser IDEs and code sharing tools are way better and Observable is taking its rightful place as the standard tool for the #d3js community.
Back in 2015 there was no easy way to quickly share or tweak an existing d3 example, so almost 200 people backed the kickstarter, and in the 5 years since more than 5,000 people have used blockbuilder to create, fork and share d3 examples. In that same time period 400,000 people have visited Blockbuilder over 2 million times. The vast majority of those visits are to those very examples created by the community.