---
title: Extending Jan
description: Jan is a ChatGPT-alternative that runs on your own computer, with a local API server.
keywords: [Jan, ChatGPT alternative, on-premises AI, local API server, local AI, llm, conversational AI, no-subscription fee]
---

## Overview

- Jan exports a developer SDK which lets you customize assistants, Jan app, and more.
- Jan exports a AI-friendly UI kit which lets people customize the [Jan UI](/specs/user-interface).
- Jan provisions a local AI server which lets you built external applications on other platforms.
