If you want to contact us feel free to post your idea, error report or general request to the community forums.
If you don't want to post to the community you can send a mail to mail[at]invoiceplane.com
InvoicePlane is not a commercial product. It is developed in our free time, as a hobby. We do your best to fulfill any legal requirements but we cannot make sure that the app is working 100% correct for your particular business. We neither offer 24/7 support nor any form of SLA or paid help. All support is provided by the community.