Psypad is an open source platform for facilitating visual psychophysics experiments on an iPad.
The accompanying iPad app (available in the AppStore ) can run staircase or MOCS procedures using a library of images that you create to determine visual stimuli. Your image library can be built using a tool of your choice (eg R, MATLAB, etc), and uploaded through this server. This server can also be used to configure tests, and process logfiles from tests that have been conducted on the iPad.
To request an account on this server, email Andrew Turpin.
If you already have an account, login and navigate the site using the links above.