Measured by GitHub stars, which is a good proxy:
https://star-history.t9t.io/#digitallyinduced/ihp&yesodweb/y...
We also have a very active community, e.g. over 100 people in Slack, over 180 in Gitter, over 100 weekly active projects (https://ihp-telemetry.digitallyinduced.com/admin/Events <- here's some telemetry)