Umami

Umami is a TypeScript analytics server that runs on any Node.js host — Vercel, Railway, a bare VPS — with PostgreSQL or MySQL as the backing store. Point a 2 KB tracking script at as many sites as you like from a single install, and all the raw data stays in your database. No third-party servers receive the events, no cookies are set, and the MIT license means the self-hosted version is completely free with no feature gates or pageview caps.

The dashboard is deliberately minimal: sessions, bounce rate, page views, top referrers, countries, and devices, plotted over a time window you choose. Custom events accept arbitrary key-value properties, so you can track signups, button clicks, or checkout completions alongside standard pageviews without a separate tool. Multi-site support under one login makes Umami practical for developers managing several projects or agencies reporting to multiple clients.

The honest constraints are scope and ecosystem maturity. Umami does not provide funnels, session replay, A/B testing, or retention analysis. The cloud offering at umami.is includes a free tier for smaller sites, but the integration library, community plugins, and documentation depth lag behind older tools like Plausible. For pure privacy-first traffic reporting at zero recurring cost — especially for indie developers or open-source projects — Umami's combination of MIT licensing and one-click Vercel deployment is difficult to match.