Google Analytics 4 vs Heap in 2026: Free traffic measurement vs autocapture product analytics
One is the free default for measuring where visitors come from and what they do once they arrive. The other autocaptures every click inside your product and lets you define events after the fact, at a price that only shows up after a sales call.
Google Analytics 4
Heap- Google Analytics 4 is free with no hit or session caps. Heap's free tier caps at 10,000 monthly sessions and only 6 months of data history, which is thin for a production app.
- Heap autocaptures every interaction from a single snippet and lets you define events retroactively. GA4 requires events to be configured, either automatically for standard interactions or manually through Google Tag Manager.
- GA4's machine learning is built for marketing: predictive audiences, purchase probability, and churn probability sync straight into Google Ads. Heap Illuminate is built for product teams: it surfaces which in-app behaviors correlate with conversion or retention.
- Heap's paid tiers (Growth, Pro, Premier) are all contact-sales only, with no public pricing anywhere. GA4's only paid tier, Analytics 360, is also enterprise-only, but the free tier covers the overwhelming majority of real use cases.
- GA4 includes a free, unsampled BigQuery export on every property. Heap's equivalent, Heap Connect, is an add-on on Pro and only included outright on Premier.
- Neither tool has anything resembling a live A/B testing engine or a way to tell you if your brand is being cited inside an AI-generated answer; both only measure activity that already happened on a page or in a session.
Google Analytics 4 and Heap get compared more often than they should be, because they solve different halves of the same problem. GA4 is free, unlimited on standard use, and built to tell you where traffic comes from and how it converts, with machine learning layered on top for predictive audiences and Google Ads targeting. Heap is a product analytics tool built around autocapture: a single snippet records every click, scroll, and form submission from day one, so you can define an event retroactively instead of waiting on a developer ticket. GA4 wins on cost and marketing-channel depth. Heap wins on catching the data you did not know you needed until six months later. The two are often run side by side rather than picked as a single winner, but if you can only run one, the decision comes down to whether your bigger blind spot is acquisition or in-product behavior.
The tools at a glance
Google Analytics 4
Free web and app analytics with machine learning predictions and native Google Ads integration
GA4 is Google's event-based analytics platform, and it has been the mandatory version of Google Analytics since Universal Analytics was shut down in July 2023. Every interaction, whether a page view, a scroll, or a custom action, is logged as an event rather than tied to a session, which is what lets GA4 stitch together a user's activity across a website and a mobile app in the same property.
The strongest part of GA4 is not the reporting UI, which most people find more confusing than Universal Analytics ever was. It is what sits behind it: predictive audiences that estimate purchase and churn probability, a bidirectional Google Ads integration that shares conversion and audience data automatically, and a free BigQuery export that hands you raw, unsampled event data with no Analytics 360 contract required.
What GA4 does not do is track behavior the way a product analytics tool does. There is no session replay, no autocapture, and nothing retroactive: if you did not define an event before a user did the thing, that data is gone. It is also not built for agencies to hand off to clients directly; you need a separate reporting layer like Looker Studio or Reporting Ninja to make GA4 data presentable to a non-technical stakeholder.
| Feature | Google Analytics 4 (Free) Free | Analytics 360 (Enterprise) Custom (enterprise contract) |
|---|---|---|
| Web and app tracking | Yes | Yes |
| Predictive audiences / ML | Yes | Yes |
| Google Ads integration | Yes | Yes |
| BigQuery export | Yes (daily) | Yes (intraday) |
| Data retention | 14 months max | 50 months |
| Sampling on complex reports | Applies | Unsampled |
| SLA and dedicated support | No | Yes |
Heap
Autocapture product analytics that records every interaction so you never miss the data you did not know to track
Heap starts from a different premise than most analytics tools: instead of asking you to decide what to track before you have any data, it captures everything from the first click and lets you decide what matters later. One script tag records clicks, pageviews, form submissions, and every other interaction automatically, and you can build a "virtual event" retroactively from that history at any point after the fact.
Heap Illuminate is the feature that separates it from a plain event logger. It runs statistical analysis across the full interaction history and surfaces which specific user behaviors correlate most strongly with conversion or retention, without an analyst needing to hypothesize a funnel first. Since the 2023 Contentsquare acquisition (the same parent company as Hotjar), Heap users also get Sense Chat, a natural-language assistant for asking questions about the data without building a report manually.
The catch is access. The free tier caps at 10,000 monthly sessions with only 6 months of data history, which is workable for evaluating the product but too thin for most production apps. Every tier above that, Growth, Pro, and Premier, is contact-sales only with no published price anywhere, so you cannot budget for Heap the way you can budget for a tool with a pricing page.
| Feature | Free $0 | Growth Contact sales | Pro Contact sales | Premier Contact sales |
|---|---|---|---|---|
| Monthly sessions | Up to 10k | Custom | Custom | Custom |
| Data history | 6 months | 12 months | Custom | Custom |
| Autocapture + retroactive events | Yes | Yes | Yes | Yes |
| Sense AI assistant | No | Yes | Yes | Yes |
| Session replay / heatmaps | No | No | Add-on | Add-on |
| Data warehouse sync (Heap Connect) | No | No | Add-on | Yes |
Head-to-head feature comparison
| Feature | Google Analytics 4 | Heap |
|---|---|---|
| Pricing model | Free, with an enterprise-only paid tier (Analytics 360) | Free tier, then contact-sales for every paid plan |
| Free tier limit | Unlimited hits and sessions on the free tier | 10,000 monthly sessions, 6 months of history |
| Event capture method | Automatic standard events plus manual/GTM-configured custom events | Autocapture (every click, pageview, and form submission recorded automatically) |
| Retroactive event definition | No | Yes (define virtual events from the full interaction history) |
| Machine learning / predictive audiences | Yes (predictive audiences, purchase and churn probability) | No (no ad-platform predictive audiences) |
| Automated insight discovery | Yes (Proactive Insights) | Yes (Heap Illuminate) |
| Session replay | No | Add-on on Pro and Premier only |
| Cross-platform (web + app) tracking | Yes (one property covers web and app) | Yes (native iOS and Android SDKs) |
| Native Google Ads integration | Yes (bidirectional audience and conversion sync) | No |
| Free data warehouse export | Yes (free daily BigQuery export) | Add-on on Pro, included on Premier (Heap Connect) |
| AI-assisted natural-language querying | No | Yes (Sense Chat, Growth and above) |
| Starting price | Free | $0 (paid tiers undisclosed) |
Neither GA4 nor Heap tells you what happens before a visitor clicks anything
GA4 can show Gemini as a referral source once someone lands on your site from an AI chat answer, and Heap will autocapture whatever that visitor does after arriving. Neither tool has any visibility into the much larger share of AI answers where your brand is mentioned, recommended, or skipped entirely with no click at all. That gap is what AI Peekaboo tracks: whether ChatGPT, Gemini, Claude, and Perplexity are citing your brand in the first place, with a read/write API and white-label reporting for agencies who already build client dashboards around GA4 data.
Read the AI Peekaboo review →Which should you choose?
Google Analytics 4HeapGoogle Analytics 4HeapGoogle Analytics 4HeapGoogle Analytics 4GA4 and Heap are not really fighting over the same budget line. GA4 answers "where did this traffic come from and did it convert," which is a marketing and acquisition question, and it answers it for free at a depth few paid tools match. Heap answers "what did this user actually do inside my product," which is a product question, and it answers it without requiring anyone to have planned the tracking in advance. Teams that need both tend to run GA4 for the top of the funnel and a tool like Heap for what happens after signup, rather than choosing one to replace the other.
Bottom line
Install GA4 regardless of anything else; it costs nothing and there is no serious competitor at that price for acquisition and conversion measurement. Bring in Heap only once you have a specific, recurring problem GA4 cannot solve, meaning you keep needing to answer questions about in-product behavior that nobody instrumented ahead of time, and you are prepared to go through a sales call to get past the 10,000-session free cap. For most small and mid-size sites, GA4 alone covers the job; Heap earns its place once a product team, not just a marketing team, needs the data.
Frequently asked questions
Is Heap a replacement for Google Analytics 4?
No, they answer different questions and most teams that use Heap seriously still run GA4 alongside it. GA4 covers acquisition, traffic sources, and marketing conversion at no cost, while Heap focuses on in-product behavior after a user has already arrived. Dropping GA4 for Heap would mean losing free Google Ads integration and channel-level attribution that Heap does not attempt to replicate.
Which is better for a small SaaS startup, GA4 or Heap?
Start with GA4 because it is free with no session cap and gets you acquisition data on day one. Add Heap once you have paying users and specific product questions GA4 cannot answer, such as which in-app actions predict which users upgrade, since Heap's retroactive event definition becomes genuinely valuable only after you have real usage data accumulating.
Does GA4 have autocapture like Heap?
Not in the way Heap defines it. GA4 automatically tracks a fixed set of standard events, like page views, scrolls, and outbound clicks, but anything beyond that requires manual configuration through Google Tag Manager or code. Heap's autocapture records every interaction from the start with no predefined list, and lets you turn any of it into a trackable event after the fact, which GA4 cannot do retroactively.
Why is Heap's pricing not public?
Heap has never published pricing for its Growth, Pro, or Premier tiers, and all three require a sales conversation. This is common for product analytics platforms that price partly on session volume and partly on which add-ons (session replay, Heap Connect, behavioral targeting) you need, but it does make Heap harder to evaluate on a tight timeline compared to a tool with a public pricing page.
Can GA4 data feed into a data warehouse the way Heap data can?
Yes, and GA4's version is actually more accessible. GA4 includes a free daily BigQuery export on every property with no paid contract required, while Heap's equivalent (Heap Connect, syncing to Snowflake, BigQuery, or Redshift) is an add-on on the Pro tier and only included by default on Premier.
Does either tool track whether my brand shows up in ChatGPT or Gemini answers?
No, both tools only measure activity that happens after a visitor has already clicked through to your site. GA4 can register Gemini as a referral source if a click does happen, but neither GA4 nor Heap has any way to see whether your brand was mentioned, recommended, or ignored inside an AI-generated answer where no click ever occurs, which is a separate measurement problem that dedicated AI visibility tools are built to solve.