Inform is a design system for interactive fiction based on natural language. It is a radical reinvention of the way interactive fiction is designed, guided by contemporary work in semantics and by the practical experience of some of the world's best-known writers of IF.

Interactive fiction

Interactive fiction lets the player explore your worlds and stories through text. Write adventure games, historical simulations, gripping stories or experimental digital art.

Code that reads like English

Inform's source reads like English sentences, making it uniquely accessible to non-programmers. It's very easy to get started. Watch a screencast.

Platform Independence

Inform runs under Mac OS X, Windows, Linux, and more. The games it produces can be played on an even wider range of platforms, including handheld devices, legacy computers and the iPhone. Download Inform for your platform.

Support for Teachers

Inform is used in the classroom by teachers at all levels from late elementary school through university. Playing and writing interactive fiction develops literacy and problem-solving skills and allows the development of historical simulations. See tutorials and reports from the field.

Community Support

A large and varied community of users write with Inform, which means that technical support and guidance is always available.


Inform is widely used with screen-readers and other tools serving the visually-impaired.

New build 6L02 now out

Inform build 6L02, new for May 2014, makes a major reform of the language. Text handling is better, Inform can now generate adaptive grammar, there's real number support, and much more.

Public Library debuts

Build 6L02 also introduces a Public Library of extensions, downloadable from within the Inform application. (This feature debuts on Mac OS X, but will spread to other platforms soon.)

New bug tracker

Inform now has an open bug tracker (powered by Mantis). Of course, the software is perfect, but this is where faults would be reported if not

Documentation available as EPUBs

The two books in Inform come built in to the application, but you can also download them as EPUB ebooks.


Inform's first website was a single hand-coded HTML page in the primitive, 10,000-site Web of 1995. Today the Web has a hundred million sites, and we're larger and better too. This is our fourth website, coded by Liza Daly of Threepress Consulting using the Django content management framework. Welcome.