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

# Introduction

> Welcome to Simular developer documentation — Sai, Simulang, and Agent S.

Welcome to the **Simular** developer documentation. Here you will find guides and references for **scripting with Simulang** and the **Agent S** open-source framework. **[Sai](https://www.simular.ai/sai)** is Simular's **strongest computer-use agent** for when you need maximum capability on real desktop and browser UIs.

## Sai and Agent S

### **1. [Sai](https://www.simular.ai/sai)**

**Sai** is Simular's **strongest computer-use agent** — our most capable option when you need deep, reliable automation across real desktop and browser UIs. Details, access, and how Sai fits with the rest of the product line are on the **[Sai product page](https://www.simular.ai/sai)**.

### **2. [Agent S](agent-s/introduction)**

An **open-source** framework for agents that **control computers like a human** — UI, keyboard, and mouse — across environments.

* Run agents **autonomously** inside many kinds of software.
* **Extensible** with custom integrations and tooling.
* **Platforms:** **macOS, Linux, and Windows**.

***

## Simulang (scripting)

**Simulang** is our layer for scripting desktop automation. This documentation covers **two tracks**; treat them separately:

| Track               | What it is                                                                                                                         | Where to start                                                                                               |
| ------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ |
| **Latest Simulang** | Standalone **`simulang` CLI**, **`simulang-js`**, and the **`/simulang`** skill in **Claude Code**.                                | [Simulang Primer](simulang/simulang-primer), then [Simulang with Claude Code](simulang/simulang-claude-code) |
| **Simulang v0**     | **Legacy** in-app JavaScript-style actions for a **deprecated** desktop automation surface. Kept for reference and migration only. | [Simulang v0 API](simular-pro/simulang), [Simulang v0 examples](simular-pro/examples)                        |

For **new** work, use **Latest Simulang** (primer and Claude Code). Use the **v0** docs only if you still maintain workflows on the legacy in-app surface.

Looking for something to read or remix end-to-end? The new **[Simulang Recipes](https://github.com/simular-ai/simulang-recipes)** repo collects community-built automations — a 2048 bot, a Wordle solver, a Calendar-to-Docs digest, a TikTok forwarder, and more — each one a small, runnable script you can clone and adapt.

***

### Next steps

* Read about **[Sai](https://www.simular.ai/sai)** for Simular's strongest computer-use agent.
* Choose your **Simulang** track from the table above (prefer latest for new projects).
* Browse the **[Simulang Recipes](https://github.com/simular-ai/simulang-recipes)** repo for runnable, end-to-end automations to clone and remix.
* Explore **[Agent S](agent-s/introduction)** to build or extend open-source computer-use agents.
* Join the community via **Discord** and **GitHub** in the header when you want help or to contribute.

For more detail, use the sidebar: **Getting Started**, **Simulang**, **Simular** (legacy Simulang v0 reference), and **Agent S**.