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Five free tracking debuggers, fifteen capabilities, and the rows where another tool wins. Compiled from public documentation, dated and sourced.
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| Capability | Tag Master | Tag Assistant | Omnibug | Meta Pixel Helper | Analytics Debugger |
|---|---|---|---|---|---|
| What it sees | |||||
| Platforms decoded | 52 | Google only | ~69 | Meta only | GA4, GTM, Adobe + |
| 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 | |||||
| Interface | Side panel | External site | DevTools panel | Popup | DevTools panel |
| Last updated | Aug 2026 | Active | Jan 2025 | Active | Sep 2023 |
| Price | Free | Free | Free | Free | Free |
Comparison compiled in August 2026 from each tool's public documentation and Chrome Web Store listing. Spotted something out of date? Tell us and we'll fix it.
No single debugger wins everywhere. These are the cases where another tool is the better answer — often alongside Tag Master rather than instead of it.
Only Google can explain its own container. When you need to know which trigger matched and what each variable resolved to, use Tag Assistant — Tag Master opens it for you with the container prefilled.
Broader raw vendor coverage: roughly 69 providers against our 52. 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.
The Meta helper reads its pixel from the inside — diagnostics and warnings straight from Meta. For deep single-platform troubleshooting it goes further than any third-party tool can.