A free MIT library that counts usage on an ETS hot path (no DB on the write path), gates features by plan with an atomic with_quota/4, and renders live usage in LiveView over PubSub, Syncs with Stripe. Discussion on the forum: https://forum.elixirforum.com/t/aurora-meter-real-time-usage-metering-and-plan-entitlements-for-phoenix/76602

Link: https://github.com/liamkillingback/aurora-meter