---
title: Client-Side Custom Instrumentation
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > APM > Application Instrumentation > Code-Based Custom Instrumentation >
  Client-Side Custom Instrumentation
---

# Client-Side Custom Instrumentation

## Overview{% #overview %}

Use client-side custom instrumentation to capture observability data from your mobile applications. This section covers custom instrumentation for Android and iOS platforms.

Select your platform to get started:



- [Android](https://docs.datadoghq.com/tracing/trace_collection/custom_instrumentation/client-side/android/)
- [iOS](https://docs.datadoghq.com/tracing/trace_collection/custom_instrumentation/client-side/ios/)



## Further reading{% #further-reading %}

- [Android Custom Instrumentation](https://docs.datadoghq.com/tracing/trace_collection/custom_instrumentation/client-side/android/)
- [iOS Custom Instrumentation](https://docs.datadoghq.com/tracing/trace_collection/custom_instrumentation/client-side/ios/)