Extempore 是一套实时编程语言和运行环境，它提供了一个机体编程 (Cyberphysical Programming)[1] 环境，以支持对多媒体和实时系统的实时编程（Live Coding）。所谓机体编程，就是允许编程者可以在任意时刻自由地修改程序并即时影响系统的运作，达到“即写即执行”。官方的介绍如下：
Extempore is a programming language and runtime environment designed to support ‘cyberphysical programming’. Cyberphysical programming supports the notion of a human programmer operating as an active agent in a real-time distributed network of environmentally aware systems. The programmer interacts with the distributed real-time system procedurally by modifying code on-the-fly.
Extempore 的前身是 Impromptu ，由 MOSO 公司的创始人 Andrew Sorensen 所设计和开发，并托管在 Github 上。
