Integrating Firebase Analytics is an excellent first step toward understanding how users interact with your application—but it's only the beginning.
The real value comes from Google Analytics 4 (GA4), where raw events are transformed into meaningful reports, dashboards, funnels, audiences, and business insights.
GA4 helps developers, product managers, and marketers answer questions like:
- How are users discovering the app?
- Which features are used the most?
- Where do users drop off during important flows?
- Which campaigns drive the highest conversions?
- How can the overall user experience be improved?
In this article, we'll explore the key GA4 features every mobile developer should understand.
Table of Contents
- Realtime Report
- Reports Snapshot
- Events
- Custom Events
- Screen Tracking
- Custom Definitions
- Key Events (Conversions)
- Acquisition
- Engagement
- Monetization
- Ecommerce
- Checkout Journey
- Promotions
- Campaign Tracking
- Audiences
- BigQuery Integration
- User ID
- Best Practices
- Final Thoughts
1. Realtime Report
The Realtime Report is one of the most useful tools during development.
It allows you to verify that your application is sending analytics events correctly within seconds.
You can quickly validate actions such as:
- App opens
- Screen views
- User sign in
- Button clicks
- Item views
- Add to cart
- Checkout
- Purchases
Instead of waiting for reports to process, the Realtime Report provides immediate feedback while testing your implementation.
2. Reports Snapshot
The Reports Snapshot provides a high-level overview of your application's performance.
Some of the metrics available include:
- Active users
- New users
- Sessions
- User engagement
- Event count
- Top screens
- Revenue
- Retention trends
Think of it as the health dashboard for your application.
3. Events
Everything in GA4 revolves around events.
Every user interaction—whether automatic or custom—is recorded as an event.
Common examples include:
login
sign_up
view_item
select_item
search
add_to_cart
begin_checkout
purchase
share
By consistently tracking meaningful events, you create the foundation for all GA4 reports.
4. Custom Events
Not every application fits predefined event categories.
Custom events allow you to measure actions that are unique to your application's functionality.
Examples include:
profile_completed
subscription_started
subscription_cancelled
feature_used
feedback_submitted
payment_failed
notification_opened
Custom events become even more powerful when combined with parameters and custom definitions.
5. Screen Tracking
Understanding how users navigate your application is essential.
Typical screens include:
- Home
- Search
- Details
- Profile
- Settings
- Notifications
Screen tracking helps answer questions such as:
- Which screens receive the most visits?
- Where do users spend the most time?
- Which screens have the highest exit rate?
- What navigation paths are most common?
6. Custom Definitions
Event parameters are collected with your events, but to use them in GA4 reports, you often need to register them as Custom Definitions.
Examples include:
- User Role
- Subscription Plan
- Content Category
- Payment Method
- App Version
- Device Type
Custom definitions make it possible to filter, segment, and analyze reports using business-specific information.
7. Key Events (Conversions)
Some user actions are more valuable than others.
GA4 allows you to mark important events as Key Events (formerly called Conversions).
Examples include:
- User Registration
- Purchase
- Subscription
- Form Submission
- Profile Completion
Tracking Key Events helps measure the success of your application's goals.
8. Acquisition
The Acquisition reports answer an important question:
Where are your users coming from?
GA4 categorizes traffic sources such as:
- Organic Search
- Direct
- Social Media
- Referral
- Email Campaigns
- Paid Advertising
These reports help marketing teams understand which channels bring the most valuable users.
9. Engagement
Engagement reports focus on how users interact with your application after they arrive.
Important metrics include:
- Engagement time
- Engaged sessions
- Screen views
- Event count
- Returning users
Strong engagement usually indicates a better user experience.
10. Monetization
For applications that generate revenue, the Monetization reports provide valuable financial insights.
You can monitor:
- Revenue
- Purchases
- Refunds
- Average Revenue Per User (ARPU)
- Purchase trends
These reports help evaluate business performance over time.
11. Ecommerce
GA4 provides built-in support for ecommerce tracking.
Recommended ecommerce events include:
- view_item
- view_item_list
- select_item
- add_to_cart
- remove_from_cart
- begin_checkout
- add_payment_info
- purchase
- refund
Using Google's recommended event names ensures better compatibility with GA4 reports.
12. Checkout Journey
One of GA4's most useful capabilities is identifying where users abandon the purchase flow.
Example funnel:
View Item
↓
Add to Cart
↓
Begin Checkout
↓
Add Payment Information
↓
Purchase
Analyzing drop-off at each step helps identify friction points and improve conversion rates.
13. Promotions
If your application displays promotional content, GA4 can measure its effectiveness.
Examples include:
- Promotional banners
- Featured content
- Coupons
- Seasonal offers
- Limited-time campaigns
You can compare impressions, clicks, and resulting conversions to understand which promotions perform best.
14. Campaign Tracking
Campaign tracking allows you to measure marketing performance using UTM parameters.
Common campaign parameters include:
- utm_source
- utm_medium
- utm_campaign
- utm_content
- utm_term
This makes it easier to evaluate app installs and user engagement from different marketing channels.
15. Audiences
GA4 enables you to create dynamic audiences based on user behavior.
Examples include:
- New Users
- Returning Users
- Active Users
- Inactive Users
- Subscribers
- High-Value Users
These audiences can be used for reporting, personalization, and advertising integrations such as Google Ads.
16. BigQuery Integration
One of GA4's most powerful features is its native BigQuery integration.
Instead of relying only on standard reports, you gain access to raw event-level data.
This enables:
- SQL analysis
- Custom dashboards
- Funnel analysis
- Cohort analysis
- Machine learning
- Predictive analytics
- Data warehouse integration
For organizations working with large datasets, BigQuery unlocks virtually unlimited analytical possibilities.
17. User ID
By default, GA4 identifies users using device or browser identifiers.
This means a single person using multiple devices may appear as multiple users.
Without User ID:
One User
↓
Multiple Devices
↓
Multiple User Records
With User ID:
One User
↓
Multiple Devices
↓
Single Unified Identity
Implementing User ID provides more accurate cross-device reporting while respecting your application's authentication and privacy policies.
Best Practices
To build a scalable analytics implementation:
- Use GA4 recommended event names whenever possible.
- Keep event names consistent across platforms.
- Track only meaningful user interactions.
- Register important parameters as Custom Definitions.
- Mark business-critical actions as Key Events.
- Validate implementations using the Realtime Report.
- Create an event tracking plan before development begins.
- Periodically review reports and remove unused events.
A well-planned analytics strategy produces cleaner reports and more actionable insights.
Final Thoughts
Google Analytics 4 is much more than a reporting dashboard—it's a comprehensive analytics platform that helps teams understand user behavior, measure business outcomes, and continuously improve digital experiences.
The quality of your analytics depends on the quality of your event strategy. By designing meaningful events, capturing useful parameters, and leveraging GA4's reporting capabilities, you can turn raw data into insights that drive better product decisions.
In the next article, we'll explore best practices for designing a scalable event architecture and implementing Firebase Analytics and GA4 effectively in React Native applications.
✍️ Written by Dainy Jose — React Native Mobile Application Developer with 3+ years of experience building cross-platform mobile apps using React Native (Expo, TypeScript, Redux).
Currently expanding backend knowledge through the MERN Stack (MongoDB, Express.js, React.js, Node.js) to create more efficient, full-stack mobile experiences.
💼 Tech Stack: React Native · TypeScript · Redux · Expo · Firebase · Node.js · Express.js · MongoDB · REST API · JWT · Jest · Google Maps · Razorpay · PayU · Agile · SDLC · Git · Bitbucket · Jira
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