Question2Answer

Last reviewed Sep 13, 2026 · 840 words

Question2Answer is a 256 MB, plain-PHP-and-MySQL way to run a voting-and-reputation Q&A site, and it has been exactly that since 2010. Its strength is that a Stack-Overflow-shaped community fits in a folder on the cheapest shared hosting you can find. Its weakness is that the project moves slowly and the stock theme looks the age of the codebase, so you should decide up front whether you want a Q&A engine specifically or a general community forum, because if it is the latter, Discourse or Flarum will serve you better and this page will save you an evening.

The install is a folder, a database and one config file

There is no build step, no Node, no Redis. Unzip the release into your web root, copy qa-config-example.php to qa-config.php, fill in the MySQL credentials, and load the site in a browser; the installer creates the tables and the first admin account. On a fresh VPS that is under 10 minutes including the LAMP install. The catalogue's "Easy" rating is deserved, and the 256 MB floor is real: I have seen Q2A serve a few thousand questions comfortably from a container with less memory than a single Chrome tab. Upgrades are the same operation in reverse, overwrite the files, load /admin, and let it migrate the database.

Voting, reputation and closing are why you pick it over a forum

A forum thread is a conversation. A Q2A question is a problem with candidate answers, one of which gets accepted, and the accepted answer floats to the top regardless of when it was posted. That structural difference is the entire reason to choose a Q&A engine: support sites, internal knowledge bases, and hobby communities where the same 200 questions get asked repeatedly all benefit from answers outranking chatter. Q2A implements the full Stack Exchange grammar: up and down votes on questions and answers, reputation points that gate permissions, comments distinct from answers, tags and categories, closing duplicates, and a "related questions" panel at ask time that reduces repeats. Points and permission thresholds are all adjustable in the admin panel, which matters because Stack Overflow's defaults are hostile to a 50-person community.

The default theme is the first thing you replace

The bundled SnowFlat theme is functional and responsive, and nobody will mistake it for a 2026 site. A handful of community themes exist and most Q2A sites of any size have a custom one; the theme system is a PHP class that overrides HTML output methods, so a developer comfortable with PHP can restyle it in a day. The plugin directory on question2answer.org covers the essentials, single sign-on, Markdown editing, spam control, badges, SEO tweaks, but many entries are years old. Test each on a staging copy; a plugin written for PHP 7 may throw deprecation warnings on a current PHP.

Slow development is the risk, not abandonment

The 1.8 series has been the stable line for years, with maintenance releases that mainly track PHP compatibility. That is fine for a product that is essentially finished, and it is not fine if you expected the feature velocity of a venture-backed forum. Practically it means two things: newer PHP versions get supported later than you would like, so check the release notes before upgrading the runtime, and the security story rests on a small volunteer team plus the fact that the attack surface is small. For a public site, put it behind a reverse proxy with rate limiting, keep registration behind a captcha plugin, and take nightly MySQL dumps.

When the bigger projects are the safer pick

Discourse does Q&A as a category setting on a far more active codebase, with a modern editor and a maintained plugin ecosystem, at the cost of a Docker-based install that wants 2 GB of RAM and a real domain. Flarum is the lightweight modern forum and has a solved-answer extension. Apache Answer is the newest Q&A-specific option and looks the part, though it is a Go binary with its own opinions rather than something you drop on shared hosting. For anyone who wants a self-hosted Stack Overflow replacement for a team and has a Docker host available, Discourse is the safer default; the forums category has the full field.

What I'd do

For a hobby community on a 5-dollar shared host, or a knowledge base that must run on the PHP box you already have, I would install Question2Answer, replace the theme in the first week, lower the reputation thresholds for a small membership, and forget about it apart from monthly updates. For anything where I have a Docker host and expect the community to grow past a few thousand members, I would start on Discourse and never look back. Q2A is the right answer to a narrower question than most people are asking.