Feder and RudderStack: keep RudderStack, check the numbers you run on.
No, Feder is not a replacement for RudderStack. Keep RudderStack. 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 RudderStack?
No. RudderStack is a customer data platform that collects and governs real-time customer data and builds unified customer profiles in your own warehouse. 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 RudderStack?
They do different jobs, so one does not stand in for the other. Keep RudderStack 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 RudderStack do better?
RudderStack's JavaScript SDK can mark pages where an ad blocker is active, which helps show how many visitor sessions ad blockers affect.
In RudderStack Inc.'s words:
Thus, it is a good way to identify how many user sessions have active ad blockers.
Detect Ad-blocked Pages | RudderStack Docs, read 2026-11-12.When a data warehouse is down, RudderStack holds the pending data as staging files and tries again once the warehouse is back up.
In RudderStack Inc.'s words:
RudderStack stores the syncs as staging files and retries sending them at a later time when the cluster is up again.
Warehouse destinations FAQ | RudderStack Docs, read 2026-11-12.If a browser loses its link to RudderStack's server, the JavaScript SDK keeps a set number of recent events and keeps trying them again.
In RudderStack Inc.'s words:
While still disconnected from the dataplane, the JS SDK will try to resend the stored events to the Rudder Server.
RudderStack SDK FAQ | RudderStack Docs, read 2026-11-12.
What can go wrong with RudderStack's numbers?
RudderStack retries for a set window when a warehouse is down. Past that window the pending loads can be marked as aborted, and that data can be missing from the warehouse.
In RudderStack Inc.'s words:
After retrying for up to 3 hours, RudderStack marks the syncs as aborted.
Warehouse destinations FAQ | RudderStack Docs, read 2026-11-12.RudderStack explains that with default settings, an SDK can drop an event that still could not get through after retrying for a few hours.
In RudderStack Inc.'s words:
With the defaults, the SDK retries an event for about 3 hours before dropping it.
RudderStack SDK FAQ | RudderStack Docs, read 2026-11-12.RudderStack notes that ad blockers can stop its JavaScript SDK from loading, so visits on those pages can go unrecorded.
In RudderStack Inc.'s words:
This feature will not work if the JavaScript SDK itself is unable to load successfully due to ad blockers.
Detect Ad-blocked Pages | RudderStack Docs, read 2026-11-12.
How does Feder work with RudderStack?
- Feder has no connection to RudderStack today, so it reads nothing from it.
- The two can run side by side: RudderStack 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 RudderStack 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 RudderStack?
- No. Keep RudderStack. Feder sits beside it.
- Does Feder send data into RudderStack?
- 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 RudderStack on this page comes from RudderStack Inc.'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.