ExpORL: Research Group Experimental Oto-rhino-laryngology


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APEX 3 is a software platform for auditory behavioural and psychophysical experiments. It provides a generic means of setting up experiments without any programming. The supported output devices include sound cards and the Nucleus cochlear implant.

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Many psychophysical procedures are provided and there is an interface to add custom procedures. Plug-in interfaces are provided for data filters and external controllers. Different platforms are supported, including Linux and Windows.

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The complete APEX 3 package can be downloaded free of charge if you agree with all conditions as written in the APEX 3 license agreement. In short this means that

  • If you publish work for which APEX 3 was used, it should be cited properly
  • Your cannot give a copy of the APEX 3 Materials (Cf. License Agreement) to third parties
  • The APEX software is available under the GPLv2

Note that this summary does not replace the APEX 3 license. If in doubt, consult the APEX 3 License.


When refering to APEX 3 in a publication, please write something similar to:

The experiments were conducted using the APEX 3 program developed 
at ExpORL [Francart et al., 2008].

When using the animated child mode, you should also refer to: (pubmed link)


In order to download the APEX 3 package, click on the link below if you agree with all conditions as written in the APEX 3 license agreement. The APEX 3 Software (Source code and Binaries) is available under the GNU General Public License (GPLv2).


There are 5 forms of documentation for APEX 3:


There is no formal support for APEX 3. We do however welcome bug reports using the bugzilla system or via email.

When reporting a problem always include as much information about the circumstances as possible, including at least:

  1. APEX version (can be found in the first line of the message window) (example)
  2. The error message, if available (can be copyied by right-clicking in the message window and selecting "copy messages to clipboard") (example)
  3. You computer configuration, e.g., Windows XP, Dell Latitude internal soundcard
  4. The experiment file you used, if possible including all stimuli necessary to run it
  5. The actions necessary to reproduce the problem

You can extend APEX 3 yourself using one of the plugin interfaces. If you create a plugin that might be of general use, please send us a copy so we can incorporate it into APEX.

Mailing lists

There are two mailing lists about APEX:

ApexAnnounce: Low volume list on which new features or versions of APEX are announced.
ApexUsers: List on using APEX. Anyone can post messages to this list

To subscribe to any of the APEX mailing lists, send email to with the following text in the body of the email:

subscribe apexannounce


subscribe apexusers

Reporting problems

Please use our bugzilla system for reporting bugs in APEX 3.


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