Flarum
Simple, modern forum software for building great communities
Founded
2014
Starting Price
$0
Category
Collaboration
Last updated April 27, 2026
About Flarum
Flarum is a lightweight, open source forum software built with PHP and a modern Mithril.js-powered interface. It offers a fast, mobile-first experience with a modular extension system that makes it easy to customize and scale.
Pros & Cons
Pros
- Completely free and open source with no usage limits
- Fast, modern UI that feels like a single-page app
- Highly extensible with a rich extension ecosystem
- Lightweight and easy to deploy on basic hosting
- Active community with regular updates
Cons
Key Features
Modern UI
Clean, mobile-first interface powered by Mithril.js for a fast single-page app experience
Extension System
Modular architecture where almost everything is an extension, enabling deep customization
Multiple Views
Kanban-style discussions with tags, categories, and threaded conversations
User Management
Registration, user groups, permissions, moderators, and private messaging
Search & Discovery
Built-in search to find posts by topics, tags, or members quickly
Internationalization
38 translation packs for localization in multiple languages including French, Spanish, and Japanese
REST API
Full REST API for building integrations and custom extensions
Pricing
Open Source
$0
- Unlimited users
- Unlimited discussions
- Extension marketplace
- Full customization
- Self-hosted
Best For
Community Forums
Build discussion forums for communities, fan groups, or open source projects
Customer Support Communities
Create a space for customers to ask questions and share solutions
Knowledge Sharing
Set up a Q&A or discussion board for teams, schools, or organizations
Product Feedback
Collect and discuss product ideas and feedback from users
