SauceNAO is a reverse image search engine. The name 'SauceNAO' is derived from a slang form of "Need to know the source of this Now!" which has found common usage on image boards and other similar sites.

　　The site was designed and implemented by Xamayon, and the main search functionality was first made public in October 2008. The first index consisted of approximately 20k magazine pages, and used a modified version of the engine developed by piespy for the IQDB project. As time went on, the steadily increasing load and ever growing image set prompted us to create our own more scalable engine, which was deployed to replace the the IQDB backend in 2012. Since then, SauceNAO has grown substantially and now indexes several billion images from web services, anime, manga, movies, TV shows, and various other sources.

　　SauceNAO is, as always, still very much a work in progress. The site is constantly being modified, coverage is constantly being expanded, and new search technologies are constantly being experimented with. We like to think the rough edges are a part of its charm~ ;)

　　SauceNAO是反向图像搜索引擎。 “ SauceNAO”的名称源自“需要知道现在的来源!”的a语形式。已在图像板和其他类似网站上找到了常见用法。

　　该网站由Xamayon设计和实施，主要搜索功能于2008年10月首次公开。第一个索引包括大约2万本杂志页面，并使用了pypy为IQDB项目开发的引擎的修改版本。随着时间的流逝，负载的稳定增长和映像集的不断增长促使我们创建了自己的更具可伸缩性的引擎，该引擎在2012年被部署以取代IQDB后端。从那时起，SauceNAO有了长足的发展，现在索引了数十亿张图像。网络服务，动漫，漫画，电影，电视节目和其他各种来源。

　　像往常一样，SauceNAO仍在进行中。该站点不断地被修改，覆盖范围也在不断扩大，新的搜索技术也在不断地试验。我们喜欢认为粗糙的边缘是其魅力的一部分〜;)