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Tag Master vs Omnibug

Omnibug is a long-standing open-source decoder that lists tracking requests in a DevTools panel, covering roughly 69 providers. It matches requests by hostname, so traffic sent through a first-party or server-side endpoint does not look like the vendor it belongs to.

Only in Tag Master

  • Server-side GTM hits recognised
  • Works on first-party endpoints
  • dataLayer monitor
  • Consent Mode V2 state
  • Flags vendors firing without consent
  • Block a vendor’s hits
  • Force GA4 DebugView
  • Inject a GTM container
  • Element picker to GTM trigger

Only in Omnibug

None in this comparison.

Both

  • Export captured hits

Side by side

CapabilityTag MasterOmnibug
What it sees
Platforms decoded63~69
Server-side GTM hits recognised✓–
Works on first-party endpoints✓–
How deep it goes
Explains why a GTM trigger fired––
dataLayer monitor✓–
Consent Mode V2 state✓–
Flags vendors firing without consent✓–
What you can do with it
Block a vendor’s hits✓–
Force GA4 DebugView✓–
Inject a GTM container✓–
Element picker to GTM trigger✓–
Export captured hits✓✓
Practicalities
InterfaceSide panelDevTools panel
Last updatedSep 2026 · v1.9.0Jan 2025
PriceFreeFree

Omnibug was compared in August 2026 from its public documentation and Chrome Web Store listing; the Tag Master column is current as of version 1.9.0. Something out of date? Tell us and we’ll fix it.

When Omnibug is the better choice

Broader raw vendor coverage: roughly 69 providers against our 63. If you work with a long tail of niche ad platforms and do not need server-side or consent auditing, it may cover more of your list. It is also open source, which Tag Master is not.

Questions

Is Tag Master a replacement for Omnibug?

For most debugging, yes. In this comparison Tag Master does 9 things Omnibug does not — server-side GTM hits recognised and works on first-party endpoints among them. Omnibug still has its place, and the section on when to use it says so plainly.

Can I use Tag Master and Omnibug together?

Yes. They read the same requests from different places — Omnibug in DevTools, Tag Master in the side panel — and nothing stops both being installed.

Is Tag Master free?

Yes — every feature, with no account and no paid tier, including for commercial work.

All five tools in one table: the full comparison. Other comparisons: Tag Assistant · Meta Pixel Helper · Analytics Debugger

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Tag Master is free, needs no account, and collects no data.

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