Feder and Pirsch: keep Pirsch, check the numbers you run on.
No, Feder is not a replacement for Pirsch. Keep Pirsch. Feder does a different job beside it: it reads what your connected apps recorded and compares each number with your own history, so you know when one cannot be trusted.
Why would I need this?
Because the question is not what the number is. It is whether you can trust it.
Is Feder an alternative to Pirsch?
No. Pirsch is a privacy-friendly, open-source website analytics tool offered as an alternative to Google Analytics. Feder does a different job: it watches the numbers your tools record and says when one cannot be trusted. Nothing here asks you to switch.
Do I need Feder if I have Pirsch?
They do different jobs, so one does not stand in for the other. Keep Pirsch for the job it does. Feder's job is to say when a number your tools record has gone quiet or moved outside your own history.
What does Pirsch do better?
Pirsch counts visits without cookies.
In Pirsch Analytics's words:
We do not use cookies
Privacy | Pirsch Documentation, read 2026-11-12.Pirsch can track visits from a site's server with an API request, without relying on a script in the browser.
In Pirsch Analytics's words:
Instead of relying on JavaScript, you'll make a HTTP API request to track traffic.
Server-side Integration | Pirsch Documentation, read 2026-11-12.Pirsch funnels follow visitors step by step until they complete a conversion.
In Pirsch Analytics's words:
Multi-step marketing funnels allow you to track your visitors' journey until they complete a conversion.
Multi-Step Marketing Funnels | Pirsch Documentation, read 2026-11-12.
What can go wrong with Pirsch's numbers?
In rare cases Pirsch's bot filter can block real page views, so a few visits can go uncounted.
In Pirsch Analytics's words:
In rare cases, your page views might be blocked by our bot filter.
Troubleshooting | Pirsch Documentation, read 2026-11-12.Ad or script blockers can block the Pirsch script, so visits can go uncounted unless the site proxies it or uses server-side tracking, as Pirsch suggests.
In Pirsch Analytics's words:
Requests to pirsch.io are proxied through your server, preventing them from being blocked by ad or script blockers.
Proxying the Scripts | Pirsch Documentation, read 2026-11-12.On single-page apps the Pirsch script can load before the page has finished rendering, which Pirsch's troubleshooting guide covers, so some page views can be missed until the setup is adjusted.
In Pirsch Analytics's words:
the script may be loaded before the SPA has finished rendering the HTML of your web application.
Troubleshooting | Pirsch Documentation, read 2026-11-12.
How does Feder work with Pirsch?
- Feder has no connection to Pirsch today, so it reads nothing from it.
- The two can run side by side: Pirsch keeps doing its job, and Feder checks the numbers your other tools record against your own history.
- Feder only reads. It never changes anything in a connected app.
What should I ask about my Pirsch setup?
- Which numbers on my dashboard are counted at the source, and which are modeled or estimated?
- If this number stopped counting tomorrow, who would notice, and when?
- What does a normal week look like for this number, in my own history?
Questions owners ask
- Does Feder replace Pirsch?
- No. Keep Pirsch. Feder sits beside it.
- Does Feder send data into Pirsch?
- No. Feder only reads.
- How accurate is Feder?
- We do not publish an accuracy number yet. When there is a measured one, it will be here with how it was measured.
Where do these claims come from?
Every quoted statement about Pirsch on this page comes from Pirsch Analytics's own pages, quoted above with the date we read them. We read them again by 2027-05-11. If one changes, this page changes or comes down.