Feder and Google Tag Manager: keep Google Tag Manager, check its numbers.
No, Feder is not a replacement for Google Tag Manager. Keep Google Tag Manager. Feder sits beside it and checks whether the numbers it shows can be trusted, by reading what happened at the source and comparing it with your own history.
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 Google Tag Manager?
No. Google Tag Manager is a free tag management system that lets a business add and update its own website tags without editing code. 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 Google Tag Manager?
They do different jobs, so one does not stand in for the other. Keep Google Tag Manager 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 Google Tag Manager do better?
Tag Manager's preview mode lets a business check which tags fired on its site, and in what order, before a change goes live.
In Google's words:
Your previewed site is connected to Tag Assistant so that you can inspect which tags fired and in which order.
Preview and debug containers - Tag Manager Help, read 2026-11-12.Tag Manager keeps a snapshot of each version of a container, so a business can see what its setup looked like at an earlier time and go back to it.
In Google's words:
A version is a snapshot of a container configuration at a particular time.
Publishing, versions, and approvals - Tag Manager Help, read 2026-11-12.
What can go wrong with Google Tag Manager's numbers?
Google explains that changes in Tag Manager need to be published before they work on the site, so a change that looks finished can still be missing from the live site.
In Google's words:
you will need to publish those changes to make those changes operational on your website or mobile app.
Publishing, versions, and approvals - Tag Manager Help, read 2026-11-12.Google notes that consent tools can block Google tags, so a tag that is set up correctly can still not run for some visitors.
In Google's words:
Consent management tools may block Google tags.
Troubleshoot with Tag Assistant - Tag Manager Help, read 2026-11-12.Google notes that ad blockers in a browser can stop the Google tag from running, so some visits can go unmeasured.
In Google's words:
Ad blockers installed in your web browser may prevent the Google tag from running.
Troubleshoot with Tag Assistant - Tag Manager Help, read 2026-11-12.
How does Feder work with Google Tag Manager?
- Feder reads the tags published in your live Google Tag Manager container and feeds the Roots signal.
- A change saved only as a draft does not count until you publish it.
- A day Google Tag Manager did not report shows as Not read. It is never shown as zero.
- Feder only reads. It never changes anything in Google Tag Manager.
What should I ask about my Google Tag Manager 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 Google Tag Manager?
- No. Keep Google Tag Manager. Feder sits beside it.
- Does Feder send data into Google Tag Manager?
- 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 Google Tag Manager on this page comes from Google'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.