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---
title: Getting started
---
# Getting started
Install the CLI, run a spec.
## Prerequisites
**Android / iOS:**
- An Android emulator with API level 30 or newer (or a connected device).
- `adb` on your PATH.
**Web:**
- Chrome installed. sanderling drives it via CDP; no other setup required.
Run `sanderling doctor` to check the host environment.
## Install
### CLI
```sh
curl -fsSL https://raw.githubusercontent.com/priyanshujain/sanderling/master/install.sh | bash
```
### Spec package ([npm](https://www.npmjs.com/package/@sanderling/spec))
```sh
npm install --save-dev @sanderling/spec
```
## Your first run
### Android
The repo ships a working sample at `examples/folio`, a Kotlin Multiplatform app with a TypeScript spec under `sanderling/spec.ts`. Install `just`, then from `examples/folio`:
```sh
just install # build and install the folio APK on a booted emulator or device
just test # run the spec
```
With no device connected and multiple AVDs, pick one:
```sh
AVD=Pixel_7 just test
```
Persistent settings can live in a `.env` alongside the justfile (`AVD=Pixel_7`, `DURATION=5m`, and so on).
### Web
The repo also ships a web sample at `examples/folio-web`, a React/Vite app with the same domain logic. From `examples/folio-web`:
```sh
just test # starts Chrome, runs the spec
```
No emulator or SDK setup needed.
### Trace output
When the run ends, the trace lands in `sanderling/runs/<timestamp>/`:
```
runs/2026-04-18T12-34-56/
├── trace.jsonl
├── screenshots/
└── meta.json
```
Browse it with `sanderling inspect` (see [inspect](./inspect/)), or read `trace.jsonl` step by step.
Next: [writing specs](./writing-specs/).