LimeSurvey (formerly PHPSurveyor) is a free and open source online statistical survey web app written in PHP using a MySQL, SQLite, PostgreSQL or MSSQL database, distributed under the GNU General Public License.

[2] Its web interface enables users to develop and publish online surveys, collect responses, review statistics, and export the resulting data to other applications.

LimeSurvey was registered as a SourceForge.net project called PHPSurveyor on February 20, 2003 and was originally written by the Australian software developer Jason Cleeland.

Students developed a Database Storage Engine for LimeSurvey 2.0, and implemented the much demanded “File upload question” type.

[11] In November, LimeSurvey also participated in the Google Code-in, a similar program rewarding high school students to contribute to open source projects.

The code base for LimeSurvey 2.0 was completely re-written from scratch using a MVC (Model–view–controller) approach and the Yii PHP framework.

Besides the structural code changes aimed at better modularity the new version also has a new GUI with a completely new design using AJAX technology.

In 2016 Version 2.50 was released by LimeSurvey GmbH which has a completely revamped administration user interface and fully responsive survey design templates.

As of October 2024, both the frontend and backend of LimeSurvey are available in 116 languages and dialects; 27 of these have at least 95% of the translations done (Catalan, Chinese, Czech, Dutch, Finnish, French, Galician, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Slovak, Spanish, Swedish, Thai, Turkish).

[15] LimeSurvey is used by the Austrian Vorarlberg State Government, Ars Electronica, and several open source organizations such as OpenOffice.org, Ubuntu, and GNOME.

[26] In December 2007, LimeSurvey won the first place Les Trophées du Libre award in the category Enterprise Management.

The Les Trophées du libre contest recognizes innovative and promising Open Source projects.