What Is OpenFL and What Can You Build With It?

OpenFL is an open-source, cross-platform framework for building 2D and 3D games, applications, and interactive experiences. You write your project once using its API set, then publish to native C++ on desktop and mobile, or to JavaScript and WebGL in the browser. It is a good fit if you want a single codebase across Windows, macOS, Linux, iOS, Android, and the web, and you are comfortable working in a code-centric toolchain rather than a drag-and-drop editor.

What OpenFL actually provides

OpenFL implements a broad set of APIs that cover the common needs of interactive software. According to the project's own feature list, these include:

• Graphics: 2D and 3D rendering
• Audio: playback
• Text: rich text formatting
• Input: mouse, touch, keyboard, and gamepads
• Assets: asset management
• Networking: network access
• System access: file system access and clipboard read/write

The framework describes itself as "powerful, feature-rich," and the practical meaning is that you do not have to assemble a separate library for each of these concerns before you can start building.

One toolset, multiple targets

The core value proposition is portability. The same project can be published as:

That last row matters for planning: console support is framed as aspirational on the site, not as a guaranteed, documented target. If console release is a hard requirement, verify the current state before committing.

What people build with it

OpenFL positions itself for "enterprise applications" as well as "best-selling games," and its showcase spans games, apps, and "creative experiences." Two featured libraries illustrate the typical use cases:

• HaxeFlixel — a cross-platform game engine built on OpenFL, offering collisions, particles, and tilemaps. It powers titles such as Canabalt, Kid Bubblegum, and Friday Night Funkin'.
• Starling Framework — adds GPU-focused rendering to OpenFL, including improved batch rendering, texture atlases, bitmap fonts, and 3D effects. Games like Angry Birds, NCIS: Hidden Crimes, and CSI: Miami Heat are cited as examples.

If your project is a 2D game, HaxeFlixel is the more direct starting point. If you need finer control over GPU rendering or are porting GPU-heavy content, Starling is the relevant layer.

The licensing and cost picture

The site states that OpenFL is "100% free and open source," with no licensing fees, and that the code is hosted on GitHub with a linked license. The stated intent is that you "keep your code for the long-haul" — useful if you are avoiding per-title or per-seat runtime fees. Note that the site does not publish pricing tiers or paid editions, so the free/open-source claim is the only cost signal available; confirm the specific license terms on the GitHub repository for your distribution model.

How to decide whether it fits

Choose OpenFL when:

• You need one codebase across desktop, mobile, and web.
• Your project is a 2D game, a GPU-accelerated interactive app, or a creative experience.
• You want an open, hackable platform with community support and no licensing fees.
• You are willing to work in code (the site points to a Developer's Guide and a Download page as entry points).

Look elsewhere when:

• You need a visual editor with no coding — OpenFL is presented as a developer framework, not a no-code tool.
• Console release is mandatory today — treat that as unconfirmed until you check current platform support.
• You need a guarantee of commercial support terms — the site emphasizes community responsiveness, not a paid support contract.

Getting started

The site's own path is straightforward: use Get Started and Download to install the toolchain, then follow the Developer's Guide for API-level guidance. From there, pick a rendering approach — plain OpenFL, HaxeFlixel for a batteries-included 2D engine, or Starling for GPU-centric work — and publish to your target platform. The Showcase is a reasonable way to gauge whether projects similar to yours have shipped on the stack.