The OD App is a free resource for OD professionals and is in no way a commercial enterprise. However, there inevitably are some administrative, technical and editorial expenses related to its maintenance. In order to defray those costs, as well as support future improvements to the app, a donation mechanism is under development. If you would like to be notified when it becomes possible to contribute to the support of the OD App, leave us your email address in the field below. We are grateful for your interest and will be pleased to let you know when it will be possible to help support the app.