Amplitude vs Google Analytics 4 in 2026: Deep Product Analytics vs Free Universal Measurement
One is a behavioral analytics platform with built-in experimentation and AI Agents. The other is free, tracks every website and app on the planet, and comes with Google's ad ecosystem attached.
Amplitude
Google Analytics 4- Google Analytics 4 is free for standard use with no hit or session limits. Amplitude's free Starter tier caps at 50,000 monthly tracked users.
- Amplitude includes built-in feature experimentation and A/B testing on Growth and Enterprise plans. GA4 has no native experimentation module at all.
- GA4's BigQuery export is free on every property and removes the 14-month data retention limit. Amplitude's warehouse connectors are gated to Plus and above.
- Amplitude ships session replay linked directly to the same event timeline used for quantitative analysis. GA4 has no session replay feature of its own.
- Amplitude added an early AI visibility feature that tracks brand mentions in ChatGPT and Perplexity, something GA4 does not offer.
- GA4's native Google Ads and Search Console integrations share audience and query data bidirectionally without export friction, a strength Amplitude does not replicate.
- Neither tool includes white-label client reporting on its own; agencies delivering either data set to clients need a separate reporting layer.
Amplitude and Google Analytics 4 get compared constantly, but they solve different problems for different budgets. GA4 is free, tracks unlimited hits, and gives any website or app owner event-based measurement plus machine learning predictions and a native Google Ads connection at zero cost. Amplitude charges for its deeper capabilities: built-in A/B testing, session replay tied to behavioral events, data governance for teams enforcing clean event schemas, and AI Agents that automate recurring analysis. The real decision point is whether you need Amplitude's product-analytics depth badly enough to pay for it, or whether GA4's free ceiling already covers what your team actually does with the data.
The tools at a glance
Amplitude
AI-powered analytics platform combining behavioral data, product analytics, A/B experimentation, and session replay in a unified product intelligence suite
Amplitude is built for product teams who need behavioral event data, not just sessions and page views. The platform's data model tracks user actions across a full lifetime timeline, which supports precise funnel, path, and retention analysis that goes beyond what a general web analytics tool is built to answer.
What sets Amplitude apart from GA4 is the breadth beyond pure measurement: Amplitude Experiment is a built-in feature-flag and A/B testing system tied directly to the same behavioral data, session replay shows individual recordings linked to that same event timeline, and AI Agents can run recurring analysis and alert when metrics move. Teams that would otherwise stitch together three or four separate tools get all of it in one product.
The cost of that breadth is real. Growth and Enterprise pricing requires a sales conversation, instrumentation takes discipline to get right, and several of the headline AI features sit behind the paid tiers. Amplitude rewards teams who invest in it properly; it is not the tool to reach for if you just want a free, always-on measurement layer running in the background.
| Feature | Starter Free | Plus $49/month | Growth Contact for pricing | Enterprise Contact for pricing |
|---|---|---|---|---|
| Monthly tracked users | 50K | 1K-100K | Custom | Custom |
| Session replay | Yes | Yes | Yes | Yes |
| Feature experimentation | No | No | Yes | Yes |
| AI Agents | No | No | Yes | Yes |
| Data governance | No | Yes | Yes | Yes |
| API access | Yes | Yes | Yes | Yes |
Google Analytics 4
Free web and app analytics platform from Google with cross-platform measurement, machine learning predictions, and deep integration with Google Ads and Search Console.
GA4 is the free, mandatory replacement for Universal Analytics and the most widely deployed analytics platform in the world. Its event-based model tracks user behavior across web and app in a unified schema, and every property gets machine learning predictions for purchase probability and churn without building a model manually.
The features that make GA4 hard to justify skipping are the ones tied to the Google ecosystem: bidirectional Google Ads integration for remarketing audiences, a Search Console connection that puts organic query data next to on-site behavior, and a free daily BigQuery export that removes the standard interface's sampling and 14-month retention limit entirely.
What GA4 does not do is compete with Amplitude on product-analytics depth. There is no built-in A/B testing module, no session replay, and no data governance layer for enforcing event schemas across a growing team. Agencies also need a separate tool to turn GA4 data into client-ready white-label reports, since GA4 itself has no delivery layer of its own.
| Feature | Google Analytics 4 (Free) Free | Analytics 360 (Enterprise) Custom (enterprise contract) |
|---|---|---|
| Web and app tracking | Yes | Yes |
| Machine learning predictions | Yes | Yes |
| Google Ads integration | Yes | Yes |
| BigQuery export | Yes | Yes |
| Data retention | 14 months max | 50 months |
| Sampling | Applies on large reports | Unsampled |
Head-to-head feature comparison
| Feature | Amplitude | Google Analytics 4 |
|---|---|---|
| Free tier hit/session limit | 50,000 monthly tracked users | Unlimited |
| Built-in A/B testing | Yes (Growth and up) | No |
| Session replay | Yes (all tiers) | No |
| Data governance / schema enforcement | Yes (Plus and up) | No |
| Machine learning predictions | No | Yes |
| Native ad platform integration | No | Yes (Google Ads) |
| Data warehouse export | Yes (Plus and up) | Yes (free BigQuery export) |
| AI visibility / brand monitoring | Yes (early feature) | No |
| API access | Yes | Yes |
| BI connector | No | Yes (Looker Studio) |
| White-label reporting | No | No |
| Starting paid price | $49/month | N/A (free) |
Considering AI Peekaboo alongside Amplitude and Google Analytics 4?
Amplitude has started tracking brand mentions in ChatGPT and Perplexity as an early add-on feature, and GA4 has no equivalent at all. Neither platform was built for AI visibility monitoring, so the tracking is shallow compared to a dedicated tool. AI Peekaboo tracks brand and competitor visibility across ChatGPT, Perplexity, Gemini, and Claude specifically, with a read and write API on every plan from $50 per month and white-label reports agencies can hand straight to clients.
Read the AI Peekaboo review →Which should you choose?
Google Analytics 4AmplitudeGoogle Analytics 4AmplitudeGoogle Analytics 4AmplitudeGoogle Analytics 4GA4 wins on cost and ecosystem reach: it is free, unlimited, and plugged into Google Ads and Search Console in ways no paid tool matches. Amplitude wins on depth for teams that have outgrown page views and sessions and need experimentation, session replay, and governance built around behavioral events. The two are not really substitutes; many teams that can afford it run GA4 for marketing measurement and Amplitude for product analytics side by side.
Bottom line
Install GA4 regardless, since it costs nothing and gives every site a baseline of measurement plus Google Ads and Search Console integration. Add Amplitude once your product team needs to run controlled experiments, review session replays against behavioral funnels, or automate recurring analysis with AI Agents, and once the budget supports a Growth or Enterprise contract.
Frequently asked questions
Can Amplitude replace Google Analytics 4 entirely?
Amplitude can replace GA4 for behavioral product analytics, but it does not replicate GA4's native Google Ads and Search Console integrations or its free unlimited-scale tracking. Most teams that adopt Amplitude keep GA4 running for marketing-facing reporting and use Amplitude specifically for product experimentation and behavioral depth.
Is Amplitude worth paying for if Google Analytics 4 is free?
It depends on whether your team needs built-in A/B testing, session replay tied to behavioral data, and event schema governance. If your reporting needs stop at funnels, retention, and marketing attribution, GA4's free tier already covers that. Amplitude earns its price when a product team needs to run experiments and review qualitative session data inside the same platform as quantitative analytics.
Does GA4 have anything like Amplitude's AI Agents?
No. GA4's machine learning is limited to predictive metrics like purchase probability and churn probability, plus Proactive Insights that surface anomalies automatically. It does not have a conversational agent that can be directed to run analysis or generate recurring reports the way Amplitude's AI Agents do.
Which tool gives cleaner historical data for a data team?
GA4's free BigQuery export gives unsampled, row-level event data with no retention limit, which is a meaningful advantage over the standard 14-month cap in the GA4 interface. Amplitude's warehouse connectors are gated to the Plus tier and above, so a data team on Amplitude's free Starter plan has no equivalent export option.
Do either Amplitude or Google Analytics 4 track AI visibility for a brand?
Amplitude has an early feature that tracks how a brand appears in ChatGPT and Perplexity results, though it is newer and less developed than dedicated AI visibility tools. GA4 has no comparable feature at all. Neither is a substitute for a platform built specifically around AI answer engine monitoring.
Can agencies deliver white-label reports from GA4 or Amplitude?
Neither tool includes white-label client reporting natively. Agencies typically layer a separate reporting tool like Looker Studio, Reporting Ninja, or Octoboard on top of GA4 data. Amplitude has no built-in white-label delivery either, so the same gap exists on both sides.