For small sites there's a hobby deployment (https://posthog.com/docs/self-host/deploy/hobby) that costs $10/month to host (we can't get it below that at the moment), or we give a lot of free usage away on cloud for smaller sites. I'd stress we're product focussed (product analytics + session recording + feature flags + experiments), and plausible is web analytics (Google Analytics alternative), so choose accordingly!