This chart shows the top 100 instances by user size, colorized to make larger instances darker. This data is refreshed approximately once per hour. Currently, it's showing only Mastodon instances - in future, it will show the top 100 across multiple software platforms, and will be colorized to indicate the platform.
The data is gathered directly from the /about/more pages on each available instance. Since it currently uses primitive XPath scraping, any change to the UI may result in the data here changing.