Google Analytics
Free GA4 web and app analytics
Limits: Data retention and quota limits on standard properties
Free Analytics & Monitoring tools
FeaturedYour tool here: Sponsor this spot, $19/mo (first month free)
Plausible (self-hosted)
Plausible Community Edition: free, self-hosted, AGPL-licensed
Limits: You run and maintain the server; the managed cloud is paid
PostHog
Free tier for product analytics and session replay
Limits: 1M events and 5K recordings/month
Sentry
Developer plan for error monitoring
Limits: 1 user, 5K errors/month