Heptagrama is a fairly clean site. There is nothing here aimed at gathering any personal identifying information about you. I receive no information about you other than the one you choose to disclose when you send me an e-mail through Heptagrama's contact form.
Notwithstanding, you must know that Heptagrama uses two third-party services to fulfil the functions on the site. Heptagrama uses the services of Statcounter and to gather statistical information, and of AdZerk to display the advertising. If you wish to check their privacy policies and how they affect you, please refer to their respective websites.