# Lagsmith documentation · Docs | Lagsmith

> How to install Lagsmith, throttle and break one app’s network, monitor requests, and automate it from UI tests, the command line and AI agents.

Source: https://lagsmith.com/docs

# Lagsmith documentation

Lagsmith slows down and breaks the network for one app at a time on your Mac, including apps in the iOS Simulator.

### [Getting started](https://lagsmith.com/docs/getting-started)

Install Lagsmith and allow its network extension.

### [Presets and custom conditions](https://lagsmith.com/docs/conditions)

Edge to WiFi, custom bandwidth, latency, jitter and loss, profiles and host rules.

### [Failure modes](https://lagsmith.com/docs/failures)

Airplane Mode, refused connections, time-outs, outages, failing one endpoint.

### [Request monitoring](https://lagsmith.com/docs/monitoring)

Requests, search filters, HAR export and the mini monitor.

### [Automation](https://lagsmith.com/docs/automation)

UI test helper, `ivar`, `lagsmith://` links and the HTTP API.

### [MCP for AI agents](https://lagsmith.com/docs/mcp)

Claude Code, Cursor, Codex, Claude Desktop and Windsurf.

## Slow down one app, not your whole Mac

Free to download, with a 14-day Pro trial. No account, no card. Requires macOS 13 Ventura or later.

[Download for Mac](https://lagsmith.com/download) [Compare with Network Link Conditioner](https://lagsmith.com/network-link-conditioner-alternative)