> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apsio.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Apsio

> Know why your app crashed, froze or felt slow.

Apsio is an SDK for your iOS, Android or React Native app and a console that shows every
crash, freeze and slow screen with the steps that led to it.

These docs are written as each part ships. API preview: names may change before 1.0.

## What works today

| Part | State |
| - | - |
| [iOS and iPadOS SDK](/sdks/ios) | API preview, iOS 15 and later |
| [Android SDK](/sdks/android) | Coming soon |
| [React Native SDK](/sdks/react-native) | Coming soon |
| [Symbol upload](/symbols/upload) with the [`apsio` CLI](/cli) | dSYMs today |
| [Read API](/read-api) | v0 preview: release health, issues, session timelines |
| [Remote configuration](/remote-configuration) | Sampling, capture, masking and a kill switch per app |
| [Agents](/agents) | The read API and its OpenAPI file today; an MCP server and CLI read commands are coming |

## How the parts fit

1. The SDK in your app records crashes, hangs, launches, screens, network requests and
   sessions, and sends them to Apsio's ingest as OpenTelemetry (OTLP).
2. Apsio groups crashes and errors into [issues](/concepts/issues) and computes
   [release health](/concepts/sessions): crash-free sessions and crash-free users per release.
3. The [symbols](/concepts/symbols) you upload turn the addresses in a stack into function
   names, files and lines.
4. You read the result in the console, over the [read API](/read-api), or through an
   [agent](/agents).

## Start here

* [Quickstart for iOS](/quickstart): from an app key to your first crash.
* [Send OTLP directly](/send-otlp): from any OpenTelemetry SDK or collector, without an
  Apsio SDK.

## The open profile

Apsio's SDKs follow the Apsio Mobile Profile for OTLP, an open specification published at
[spec.apsio.io](https://spec.apsio.io/v0.1/). Your data is sent as standard OTLP, so it is
never locked in.


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