
Pros
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Flarum is completely free to use with no hidden costs.
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Yes. Flarum is 100% free and open-source under the MIT license. You self-host it on your own server. Some third-party premium extensions may have separate costs, but the core platform is free.
Flarum is lighter weight and more traditional in its forum structure, while Discourse is more opinionated and feature-rich out of the box. Flarum requires less server resources and is easier to customize through extensions, but has a smaller ecosystem.
Flarum requires PHP 8.1+, MySQL 5.6+/MariaDB 10.0.5+, and Apache/Nginx. It is a standard PHP application that can run on most shared hosting or VPS environments.
Source: flarum.org