Contact
Truemark is made by heyisoft — Hüseyin İriş, a sole developer in İzmir, Türkiye.
E-mail:
heyisoft@gmail.com
Bug reports, a bender whose published take-up is missing, or a calculation that does not match your own sheet — all welcome. If you write about a calculation, please include the numbers you typed, your bender and your unit setting; that is usually enough to reproduce it.