What external services are used to send events in mobile applications?

In mobile applications, events are often sent to external services for analytics, monitoring, and marketing. Here are some popular categories and examples of such services:

• Analytics platforms: Google Analytics for Firebase, Mixpanel, Amplitude — collect data on user behavior, sessions, conversions.
• Error and crash tracking services: Sentry, Bugsnag, Firebase Crashlytics — record errors and crashes in the app.
• Advertising and marketing platforms: Facebook Analytics, Adjust, AppsFlyer — help track the effectiveness of advertising campaigns.
• Push notifications and communications: OneSignal, Firebase Cloud Messaging — for sending notifications and collecting interaction events.

Example: when a button is pressed in the app, the event can be sent to Mixpanel for user journey analysis, and in case of a crash — to Sentry for diagnostics.