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Revision as of 13:10, 23 May 2024 by (talk) (update info rewording)
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Ruffle vector logo.svg.png
Developer(s) Mike Welsh
Nathan Adams
Callum Thomson
Repository Contributors
Latest version N/A
Active Yes
Platform(s) Windows
Emulates Adobe Flash
Support ($) Open Collective
Programmed in Rust
License MIT and Apache 2.0 (dual-licensed)
Source code GitHub

Ruffle is an experimental, free and open-source Adobe Flash emulator written in Rust, available under either the Apache 2.0 or MIT licenses. It's available as a desktop player, as a HTML5 web embed using JavaScript/TypeScript and WebAssembly, and as a browser extension which can run the web embed on any site in place of older SWF elements. Even though Ruffle is still a work-in-progress, the HTML5 version in particular has already seen widespread adoption across various sites that depend heavily on Flash content, including such famous examples as Newgrounds and Homestar Runner.


Windows Linux macOS Web Latest automatic builds
Web Web demo


As of May 2024, Ruffle primarily supports older Flash content while also supporting some AS3 contents, which use ActionScript 1.0 and 2.0 with 95% of the language and 78% of the API implemented. ActionScript 3.0 support is at 75% of the language and 70% of the API. According to Bleeping Computer, it was reported that all the SWF games they tried in February 2021 "worked flawlessly." [1]

Prominent users


Newgrounds gives the option to use Ruffle for all of its Flash content, but the site staff avoids enabling Ruffle by default on posts that haven't been confirmed as compatible yet. To manually load a Flash post in Ruffle regardless of whether or not it's the default, you can add ?emulate=flash to the end of the URL, like so.

Homestar Runner

Homestar Runner is a prime example of how most legacy Flash sites — if they adopt Ruffle at all — will use a more set-and-forget approach to installing the emulator, which unfortunately means that updates to the hosted code will be rather infrequent unless they use the official CDN.