Compare Pirsch alternatives for privacy-first analytics

Verified facts

• Flowsery publishes a sub-10KB tracking script and positions the product around cookieless analytics.

• The product includes goals, funnel analysis, privacy-safe visitor journey tracking, UTM campaign reporting, and revenue attribution.

• Flowsery lists GDPR, CCPA, and PECR compliance for its default privacy-first tracking model.

Watch for

• Flowsery is a hosted product, so it is not the right fit if self-hosting is mandatory.

• Very broad product analytics suites can offer deeper experimentation or replay workflows than Flowsery focuses on.

Verified facts

• Plausible publishes its script as 2.5KB gzipped.

• Plausible includes goals and custom events on Starter; Business adds custom properties, Stats API access, ecommerce revenue attribution, and funnels.

• Plausible Community Edition is available for self-hosting under the AGPL license.

Watch for

• Some capabilities, including the Stats API, depend on plan level.

• Teams that want built-in revenue-first journeys may still prefer a product centered on attribution.

Verified facts

• Fathom says its script is just 2KB in source code.

• Fathom includes custom events, ecommerce event value tracking, and API access.

• Fathom is hosted only; its official FAQ says local hosting is not available.

Watch for

• Fathom does not publish a permanent free plan on its pricing page.

• Public official pages checked did not show a funnel analysis feature comparable to dedicated funnel tools.

Verified facts

• Simple Analytics publishes latest.js at about 3.7KB gzip and light.js at about 1.9KB gzip.

• It supports events, automated events, Goals, Stats API, Export API, and Admin API.

• Dedicated revenue tracking was not found in the official pages checked; payment conversions can be tracked as events.

Watch for

• It is hosted SaaS; self-hosting was not found in official docs checked.

• Revenue attribution is less central than in products built specifically around revenue analytics.

Verified facts

• Umami publishes its script as under 2KB.

• Umami supports custom events with properties, goals, funnels, revenue reports, and API access, with Hobby API access marked as limited on pricing.

• Umami is open source and self-hostable, with Umami Cloud as the managed version.

Watch for

• Self-hosting means your team owns updates, scaling, and operations.

• Some advanced managed-cloud needs may depend on paid plan limits.

Verified facts

• Swetrix publishes its tracking script as under 5KB.

• Swetrix supports goals, funnels, Statistics API, Events API, and revenue tracking through Stripe, Paddle, or backend API.

• Swetrix is open source and self-hostable with Docker.

Watch for

• Cloud pricing does not show a permanent free plan in the official pricing checked.

• The broader feature set can be more than teams need if they only want basic traffic analytics.

Verified facts

• Seline publishes its script as about 2KB.

• Seline supports client and server custom events, data attributes, form events, public API access, and ingest APIs.

• Seline supports revenue tracking through Stripe sync and direct revenue events with currency and amount.

Watch for

• No permanent free plan is listed in the official pricing checked.

• Public funnel docs were not found, although funnel setup is mentioned in pricing and done-for-you material.

Verified facts

• Visitors publishes its tracking script as under 1KB.

• Visitors supports custom events, data attributes, funnel analysis, Account API, and Project API.

• Revenue attribution supports Stripe, Dodo Payments, and RevenueCat, but attribution requires persist mode and EU consent.

Watch for

• Self-hosting or open-source deployment was not found in official sources checked.

• Some revenue attribution modes require explicit consent for EU users.

Verified facts

• DataFast publishes its script as 517 bytes and under 1KB gzipped.

• DataFast supports custom goals, conversion funnels, API endpoints, and payment integrations for providers such as Stripe and LemonSqueezy.

• DataFast says it is self-hostable with Docker Compose on its homepage.

Watch for

• The default script is cookie-based unless teams choose the cookieless script.

• Open-source status was not found in the official accessible pages checked; self-hosting is described as Docker Compose on DataFast homepage.

Verified facts

• Matomo offers Cloud SaaS and open-source On-Premise deployment.

• Matomo includes goals, event tracking, ecommerce tracking, HTTP Tracking API, and HTTP Analytics API.

• Funnels are included on Cloud and available as a paid plugin for On-Premise.

Watch for

• Matomo is more feature-rich and can require more setup than simpler analytics tools.

• An official tracking script-size number was not found in the sources checked.

Verified facts

• PostHog Cloud includes product analytics, replay, feature flags, experiments, surveys, error tracking, and more.

• PostHog can be self-hosted for free with Docker Compose under MIT licensing, while many paid-plan features are cloud-only.

• PostHog supports funnels, trends, paths, retention, SQL, API access, custom events, identify, and groups.

Watch for

• It is broader and more complex than a focused web analytics product.

• PostHog includes revenue and data-stack workflows, but teams should expect a broader product analytics setup rather than a focused website revenue attribution dashboard.