# Comparison of Q&A sites

The following is a list of websites that follow a question-and-answer format. The list contains only websites for which an article exists, dedicated either wholly or at least partly to the websites.
For the humor "Q&A site" format first popularized by Forum 2000 and The Conversatron, see Q&A comedy website.
| Website | Founded | Closed | Description/focus | Languages available | Copyrighting of user contributions | Registration required? | Price |
| Answers.com | 2005 | — | All topics | English | | Free | |
| Ask.fm | 2010 | — | Social topics | 49 languages | | Yes | |
| Askbot | 2009 | N/A | varies | varies | | varies | |
| Ask MetaFilter | 2003 | — | Many topics | English | All posts are copyright to their original authors. | No to browse, yes to contribute | |
| Avvo | 2006 | — | Legal | English | | Yes | |
| Baidu Knows | 2005 | — | Many topics | Chinese | | No to browse, yes to contribute | |
| BlikBook | 2010 | N/A | Local academic | English | | Yes | |
| Blurtit | 2006 | — | All topics | English | | Yes | |
| Brainly | 2009 | — | Academic | 12 languages | Contributed content owned by its author(s) | No to browse, yes to contribute | |
| Brilliant.org | 2013 | — | Science, technology, math | English | User retains ownership; Brilliant can use, distribute, modify. | Yes/Paid | $599.99 for life time use |
| ChaCha | 2006 | 2016 | Many topics | English | Owned by ChaCha | N/A | |
| Chegg | 2005 | — | Academic | English | Owned by Chegg Inc. | Yes / paid | |
| eNotes | 2005 | — | Academic | English | Owned by eNotes.com | Yes / paid | $14.99/month; $49.99/year |
| Experience Project | 2007 | 2016 | Social topics | English | Terms of use for Experience Project | anonymous | |
| Experts-Exchange | 1996 | — | Information technology | | | Yes / paid | |
| Fixya | 2005 | — | Consumer products | English | | Yes | |
| Google Answers | 2002 | 2006 | | English | | Yes | |
| Google Questions and Answers | 2007 | 2014 | Many topics | Russian, Chinese, English, French | | N/A | |
| Gutefrage.net | 2006 | — | | German | | Yes | Free |
| HealthTap | 2011 | — | Health information | English | | No | |
| Internet Oracle | 1989 | — | All topics (humorous) | English | | No | |
| Jelly | 2013 | 2017 | All topics | English | | | |
| Knowledge IN | 2002 | — | Many topics | Korean | | | |
| LinkedIn Answers | 2007 | 2013 | Business | | | Yes | |
| MadSci Network | 1995 | — | Science | English | | | |
| Mahalo.com | 2007 | 2014 | Many topics | English | | N/A | |
| Ответы@Mail.Ru | 2006 | — | | Russian | | | |
| ProfNet | 1992 | — | Journalists | English | | Yes | |
| Quora | 2009 | — | Many topics | 22 languages | Contributions owned by the author. Quora granted "worldwide, non-exclusive, royalty-free license" to content use, distribution, or modification. | Yes, except to view single answers | Free |
| Reddit | 2005 | — | All topics | Depends on subreddit | | No to browse, yes to contribute | |
| Sharecare | 2009 | — | Health and wellness | English | | No | |
| Spring.me (formerly Formspring) | 2009 | 2015 | All topics | English | | Yes | |
| Stack Exchange | 2008 | — | Many topics | English (Q&A about other languages takes place in those languages as well as English) | Contributions owned by the author. Contributions "perpetually and irrevocably licensed to Stack Exchange under the Creative Commons Attribution Share Alike license". | No to browse and answer, yes to ask and contribute fully. Some topics allow asking as a guest. | |
| Stips | 2006 | — | All topics | Hebrew | | Yes | |
| The Straight Dope | 1973 (print) | 2018 | Many topics | English | | No | |
| Transtutors | 2007 | — | Academic | English | Owned and operated by Transweb Educational Services | Yes / paid | |
| TXN (The Experts Network) | 2011 | ? | Sports | English | | No | |
| Uclue | 2007 | 2017 | Many topics | English | | Yes | |
| WikiAnswers | 2002 | 2018 | Many topics | | Subsumed by Answers.com (one of several concurrent URLs) | | |
| English Wikipedia Reference Desk | 2004 | — | Many topics | English | CC-BY-SA 3.0 and GFDL dual license | No | |
| Yahoo! Answers | 2005 | 2021 | All topics | 13 languages | Contributions owned by the author. Yahoo retains rights to the use, distribution or modification. | No | |
| Zhihu | 2011 | — | Many topics | Chinese and a few others | Owned and operated by the original authors. | Yes, except to view answers of questions when directed from search engine |