Implementer's comparison
Amplitude vs GA4: different jobs, different tools
GA4 is a marketing-analytics tool that speaks some product analytics; Amplitude is a product-analytics tool that doesn't pretend to do ads attribution. Most teams comparing them actually need to split the job.
The verdict up front
Keep GA4 for what it is genuinely good at - acquisition reporting and the ads ecosystem - and adopt Amplitude when product questions (retention, feature adoption, funnels your PMs self-serve) become decisions rather than curiosities. The teams unhappiest with GA4 are the ones asking it product questions; the answer is rarely 'configure GA4 harder.'
How do Amplitude and Google Analytics 4 compare?
| Dimension | Amplitude | Google Analytics 4 |
|---|---|---|
| Built for | Product behavior: retention, funnels, cohorts | Marketing: acquisition, attribution, ads integration |
| Sampling | Unsampled analysis | Sampling on complex explorations at volume |
| Data retention | Plan-based (2yr on Plus; longer on upper tiers) | User-level explorations capped at 2-14 months on standard properties (GA360 extends to 50); aggregates longer |
| Self-serve for PMs | Core design goal | Explorations exist; adoption outside analysts is notoriously low |
| Ads ecosystem | Not the job | Native, unmatched (Google Ads, Search Console) |
| Price | Free to 2M events/mo, then tiered | Free (GA360 for enterprise contracts) |
Qualitative comparison from our implementation practice. Pricing specifics change - verify against both vendors’ pricing pages the week you negotiate, and see our Amplitude pricing guide for the current snapshot.
When is Amplitude the right call?
- Product decisions ride on retention, funnels, and feature adoption
- PMs should self-serve answers without an analyst queue
- Sampling or retention limits have burned you in a real meeting
When is Google Analytics 4 the right call?
- Acquisition and campaign reporting is the whole job
- The ads ecosystem integration is non-negotiable
- Budget is zero and the questions are marketing-shaped
Choosing Amplitude? Start with the implementation sprint or, if an instance already exists, the free audit. Choosing Google Analytics 4? We’ll say so plainly and hand you the fit rationale - the consult is genuinely neutral.
Frequently asked questions
Should I replace GA4 with Amplitude?+
Usually 'add', not 'replace': GA4 keeps acquisition and ads reporting, Amplitude takes product analytics. Fully replacing GA4 makes sense mainly when you don't run meaningful paid acquisition. Define which questions live in which tool - the failure mode is two tools competing to answer the same metric differently.
Why do product teams leave GA4?+
Four reasons we hear on repeat: sampling on the analyses that matter, user-level retention limits that delete history, an Explorations UX that PMs won't self-serve in, and thresholding that hides small segments. These are structural to GA4's design center - marketing analytics - not configuration mistakes.
Is Amplitude harder to set up than GA4?+
It is more deliberate. GA4's auto-collection gets numbers flowing instantly; Amplitude expects a designed event taxonomy. That upfront design is precisely why Amplitude data stays trustworthy - and if you skip it, you recreate GA4-grade chaos in a more expensive tool. Our GA4-to-Amplitude migration page covers the path, including what to do with your history.
We win either way - that's the point
Our business is making analytics stacks trustworthy - Amplitude, Segment, Adobe, GA4 among them - not selling any one license. That's what makes the recommendation worth having: it's the one page in these search results with no side to take.
Get the neutral recommendation