Tag Assistant is Google’s own debugger. It runs a debug session from an external site, connects to your GTM container, and explains Google’s tags from the inside: which trigger matched, what each variable resolved to. It sees Google’s tags only.
Only in Tag Master
Only in Tag Assistant
Both
None in this comparison.
| Capability | Tag Master | Tag Assistant |
|---|---|---|
| What it sees | ||
| Platforms decoded | 63 | Google only |
| 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 |
| Last updated | Sep 2026 · v1.9.0 | Active |
| Price | Free | Free |
Tag Assistant 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 Something out of date?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.
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.
For most debugging, yes. In this comparison Tag Master does 8 things Tag Assistant does not — server-side GTM hits recognised and works on first-party endpoints among them. Tag Assistant does one thing Tag Master does not, listed above, and the section on when to use it says so plainly.
Yes, and that is the usual setup: Tag Master for every platform’s requests, consent and server-side routing, Tag Assistant when a Google trigger needs explaining. Tag Master can open Tag Assistant with the container already filled in.
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: Omnibug · Meta Pixel Helper · Analytics Debugger
Tag Master is free, needs no account, and collects no data.
Add to Chrome — Free