Inform 7

Inform 7 is a document-based language for making interactive fiction by writing in natural-language syntax. It is best suited to authors, educators, and developers prototyping story-driven games. Choose it when prose-centered authoring matters; its language-version limit may rule it out for older projects.

Overview

Inform turns source text into interactive fiction, compiling it to Inter code or Inform 6 source code. It can also generate C code for use within a larger program, with Unity cited as an example framework. That gives technically inclined authors ways to connect their work to other software, while keeping the main focus on interactive fiction rather than general-purpose game development.

Open-sourced in April 2022, the project offers both source releases and ready-compiled apps. Inform has a long-running role in literary writing, game-industry prototyping, and school and university teaching, making it a distinctive option where writing and interaction are central.

Key features

Documentation built around examples

The app includes two interwoven books, Writing with Inform and The Inform Recipe Book, with nearly 500 examples. That gives learners a substantial set of models to study and adapt, and is a particular strength for a language whose natural-language syntax may feel unfamiliar to programmers used to conventional code.

Extensions and output choices

Inform supports supplementary source-text extensions, including optional-use extensions in the standard installation. Its public library adds user-contributed extensions under a Creative Commons Attribution licence. The compiler's Inter and Inform 6 outputs, plus C generation for larger programs, give experienced users several ways to carry work beyond the authoring environment.

Modern app versions support language versions 9.1, 9.2, and 9.3 per project, but not earlier versions. That is a significant constraint for anyone maintaining older work: check project compatibility before committing to a modern release.

Pricing

Inform 7 costs nothing. The free, open-source core includes ready-compiled apps and source releases, with no trial period to manage. There are no paid tiers or seat and project quotas in the plan, so it is accessible for individual authors, classrooms, and prototypes without a software subscription.

Platforms

Inform is available for Android, Linux, macOS, and Windows. The project provides links to apps for Linux, macOS, and Windows, and also states that apps are available for Android.

Who it's for

Inform fits writers making literary interactive fiction, game developers exploring narrative ideas, and educators teaching at school or university level. Its prose-oriented authoring and rich example library favor people who want to work directly with story text. Teams seeking a broader game engine, or authors whose projects use language versions before 9.1, should consider another tool.

For advice, users can turn to the Interactive Fiction Community Forum. Bug reports go through the project's Jira tracker, which requires a free account and login.

Pros and cons

• Natural-language authoring: gives fiction writers a prose-centered way to create interactive work.
• Nearly 500 integrated examples: provides substantial material for learning and adapting patterns.
• Multiple compiler outputs: supports Inter, Inform 6 source, and C generation for broader integration.
• Extension ecosystem: optional built-in and community-contributed extensions can broaden projects.
• Older language versions are excluded: modern releases support only 9.1 through 9.3.
• Specialized scope: its focus on interactive fiction is a poor fit for teams needing a general-purpose game engine.

Alternatives

Consider ChatMapper if you want a visual dialogue workflow with a free tier capped at one editor, three projects, and 300 nodes per project, plus core exports and commercial use. Choose Ren'Py for a free visual-novel tool spanning Android, iOS, Linux, macOS, web, and Windows. ink and Inky is another free option, with an ink-Unity integration plugin included.

Narrat offers free and open-source use for personal or commercial projects without restrictions, and custom enterprise support and consulting. TADS is free software with a free authoring system and no restrictions on games created. Yarn Spinner has a free, open-source tier with Unity, Godot, and Unreal integrations and a VS Code extension; its Unity add-on costs $75, paid once-time purchase.

Godot Asset Library is a free source of assets for users of Godot, with paid assets excluded from its official library. Narratyr has a free tier with a full visual editor and an open document format.

For broader category browsing, see Game Narrative Design Software or Game Engine Software.

Verdict

Inform 7 is a strong choice for authors and educators who want to build interactive fiction through natural-language source text, backed by extensive examples and a public extension library. Its free, open-source releases keep the cost barrier low, while its older-version cutoff and specialized focus are the main reasons to look elsewhere.