(Hi, I am the maker of Pinhole Assist)
The application is on sale in any country appStore http://itunes.com/apps/pinholeassist.

There is a bug when upgrading to 1.5, you need to remove the app and reinstall it from the store.
The exposure compensation is not activated by default : go the the "curves" tab and select your reciprocity setting (and edit it if your want, using iTunes to access the file).

Regards,
Henry