About

I'm Stefan Keller. I started programming as a hobby in 1990, first on the Atari ST, then on the classic Mac OS. Since 2006 I have been building apps for the Mac as an independent developer, and today for iPhone and iPad as well.

Almost all of my apps grew out of suggestions from users around the world. They revolve around importing, exporting and recovering data in Apple's Contacts app and Apple Calendar. Many of these apps have been around for years, and more than a few apps by other developers were modeled on them.

Every app draws on more than 35 years of experience with Apple's platforms. I take the time for the edge cases where hastily assembled software fails. That's why my apps keep working when things get complicated.

Privacy has never been an add-on for me, but a prerequisite. My apps collect no data and never have, not even at a time when privacy wasn't yet a priority for many users and developers.

Imprint

Information according to § 5 TMG

Stefan Keller
Software Development (Sole proprietor)
Wolfgang-Heinze-Straße 10
04277 Leipzig
Germany

Contact

Telephone: +49 (0) 341 33760170 (no consulting, no support)
Fax: +49 (0) 341 2191346

Email contact

For support requests via email, please use the "Contact Developer" or "Submit Support Request" command in the app's Help menu, where it exists. This function creates a new message in your email app, in which important information such as the version number of the app and the operating system used are automatically entered. If that function isn't available, the app doesn't launch, or you have any other concern, contact me at: .

Please understand that for ad-free apps in this price segment, which are offered as a one-time purchase and not as a subscription, phone support cannot be provided.

EU VAT ID

Sales tax identification number according to § 27 a Umsatzsteuergesetz:
DE266233808