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:''Pretty much all of the HTML5 emulators listed here are specifically designed to be used as [[wikipedia:Polyfill (programming)|polyfills]] by webmasters who want to keep their Flash-based sites going despite the forced obsolescence of Adobe's in-browser Flash plugin. Therefore most of these ; those emulators are therefore really not intended for personal use, however some of them (Ruffle, most notably) can be installed as browser addons using the WebExtension systemalthough it's usually not impossible.''

:An open-source Rust implementation sponsored by multiple veteran Flash game archives, most notably Newgrounds. It mainly targets HTML5, but is also available as a desktop player. The devs are planning to focus on ActionScript 1 and 2 support first, with AS3 support coming later. It's progressed to the point where it can run many early Flash games, including the original Flash version of [https://www.newgrounds.com/portal/view/59593/format/flash?emulate=flash Alien Hominid], as well as playing the vast majority of [https://old.homestarrunner.com Homestar Runner] toons. Notably, unlike the other HTML5 options, Ruffle can be installed as a browser addon using the WebExtension system, although it won't always override the copy that a website may be hosting.

:An open-source HTML5 implementation developed by the Away Foundation, under sponsorship from Poki.com. Sometimes works better than Ruffle in , depending on the specific casesFlash file you're trying to run.

:A An open-source C++ implementation that's designed specifically to provide a drop-in FLOSS alternative to both the desktop and NPAPI versions of Adobe's official playersFlash Player. Lightspark says Says it has 7879% of the APIs covered as of December 2021. Lightspark's external dependencies would make it cumbersome to port it to HTML5, so it's only available in browsers as an NPAPI/PPAPI plugin, similar to the official one from AdobeJanuary 2022.