Contact
Truewindow is made by heyisoft — Hüseyin İriş, a sole developer in İzmir, Türkiye.
E-mail: heyisoft@gmail.com
Bug reports, a window or door type you need that is missing, or a result that does not match your own profile system — all welcome. If you write about a result, please include the model, the measurements you typed, the profile system and the unit; that is usually enough to reproduce it.