QPixel review covering the open-source Q&A platform behind Codidact, its features, license, self-hosting options, pros, cons, and use cases.
QPixel is the open-source Ruby on Rails software that powers Codidact, a community-run, Stack-Exchange-style question-and-answer network. The codebase originated in 2016 as a small Q&A project, then was substantially revived and rebuilt starting in 2019 when a group of volunteers formed Codidact after a moderation controversy on Stack Exchange.
Codidact's first community, Writing, launched publicly around December 2020 running on QPixel, and the network has since grown to include several topic-specific communities, with codidact.com serving as the flagship deployment of the software.
QPixel supports multiple independent communities and post types, including traditional question-and-answer content and longer-form articles, all within a single installation. A reputation and privilege system unlocks moderation and site-management capabilities as users demonstrate trustworthy activity, and a vote-weighting algorithm accounts for controversial or contested answers rather than relying on simple upvote counts.
Content is written in Markdown with live preview, and native MathJax support makes the platform well suited to STEM communities that need to render mathematical and scientific notation. QPixel supports Docker-based deployment to simplify self-hosting.
QPixel is released under the GNU Affero General Public License version 3.0 and is free to download, self-host, and modify, with no license fee. The AGPL license requires that anyone who modifies and runs QPixel as a public service also makes their modified source code available.
Because it is a community-maintained open-source project rather than a company, QPixel has no company headquarters, subscription tiers, or paid support contract; users can either self-host their own instance or join an existing community on the Codidact network for free.
QPixel is the open-source Ruby on Rails software that powers Codidact, a community-run Q&A and knowledge-sharing platform.
Yes, QPixel is free and open-source, released under the AGPL-3.0 license with no license fee to download, self-host, or modify.
QPixel is released under the GNU Affero General Public License version 3.0, which requires modified versions run as a public service to share their source code.
Yes, QPixel supports Docker-based self-hosting, and other organizations besides Codidact run their own independent instances.
QPixel is the underlying software; Codidact is the community network and flagship deployment that runs on QPixel.
Codidact is a community-run, open-source Q&A network that formed in 2019 as an independent alternative to Stack Exchange.
Yes, QPixel includes native MathJax support for rendering mathematical and scientific notation in posts.