About Qtrac Ltd.

Qtrac Ltd. produces commercial PDF comparison software.

Our ecommerce provider, MyCommerce (owned by Digital River Inc.) stopped paying us (and it appears, many others, see The Register) in August 2024.

We no longer trust any ecommerce provider. We do not have in-house expertise either in security or in tax regulations, so we are not able to handle payments ourselves. In view of this Qtrac Ltd. has now ceased trading, and will be wound up in due course.

We recommend that any customers with unacquired license keys acquire them as soon as possible. We hope to keep the website going for a while, and we hope to keep providing support as long as possible. All keys will continue to work as before. In particular, “full” keys will continue to work so long as the hardware/BIOS doesn't change, and annual keys will continue until their normal expiry date, regardless of hardware changes. Our software does not “phone home” and does not depend on our website. (In fact, some customers use our software entirely offline.)

We are very sorry for the inconvenience to our customers, and grateful for all those who have purchased our PDF comparison software over the past decade.

Qtrac Ltd. is selling its console command line PDF comparison software, comparepdfcmd. Although comparepdfcmd has proved a successful product in its own right, it is only a thin wrapper around our Rust-based PDF comparison engine. This engine could also be used in a GUI PDF comparison application, or to provide the back-end of a web-based PDF comparison app. Interested parties should contact mark@qtrac.eu for a prospectus.

Our domains are www.qtrac.eu and www.diffpdf.com. Both are mapped to our underlying web site which is hosted on Google’s App Engine (GAE) infrastructure at diffpdf.appspot.com. (We do not endorse or recommend GAE.)

Support for our software is via email at support@qtrac.eu, support@qtrac.uk, or support@diffpdf.com.

All of our books are published by InformIT (Pearson Education)

In view of the EU’s Cyber Resilience Act and an abundance of caution, we have withdrawn all our free software.

History

Qtrac Ltd was founded in 2006. Initially it provided consultancy (software development, technical writing and editing), as well as training for programmers.

In 2014 Qtrac began selling its in-house developed PDF comparison products. The two main products, DiffPDF (a GUI desktop application) and comparepdfcmd (a console command line tool) are both accurate and very fast. Between them these products sold into 61 countries worldwide.

On 25th October 2024, after 18 years in business, Qtrac ceased trading, a victim of the Digital River/MyCommerce scandal (see, e.g., The Register, The Layoff, and Forum).

For many years we also produced a wide variety of free open source software, mostly small libraries and utilities created using many different programming languages. However, In view of the EU’s Cyber Resilience Act and an abundance of caution, we have withdrawn all our free software.