30 Years

Welcome to LPA

LPA provides a range of software development tools for both programmers and non-programmers who wish to deliver knowledge-based decision support and expert systems.

NEW! WIN-PROLOG 7.0 December Update

LPA is proud to announce the second release of WIN-PROLOG 7.0, dated 16th December 2019, continuing its ongoing commitment to maintenance of this leading Prolog compiler for Windows. This new release, marking the 30th birthday of our software, includes additional 64-bit toolkits, and modications for increased compatibility with the latest release of Windows 10. It is recommended that all existing 7.0 customers download and install the new version.

Now we are Thirty

Incredible as it seems, on the same day as our 64-bit Prolog engine reaches its first birthday, our venerable 32-bit system attains its thirtieth! Now we begin a fourth decade of Prolog excellence, with two matching compilers of unparalleled reliability and functionality.

When I'm Sixty Four

Our Prolog system, based on Brian D Steel's classic "386-PROLOG" engine, continues to power the entire LPA software suite. The classic version runs on all versions of Windows since Win98SE, and even 32-bit extended MS-DOS, but now we have some very exciting news: Brian has completed work on a brand new, 64-bit version of the engine, which now shipping ...

The WIN-PROLOG Free Trial and GDPR

Following the imposition of the new European data protection laws (GDPR), our standard 28-day Free Trial was suspended, because the existing scripts did not give users the chance to opt into subsequent mailings: they were simply added to a mailing list automatically. Until such time as we can change the scripts to comply with GDPR, please contact LPA directly if you wish to engage in a free trial of our software.


Introducing Weblog!

Weblog is the fresh, new toolkit which provides a direct, streamlined way of combining beautifully designed web pages with logical scripts written in Prolog.

Weblog separates the processes of website design and content programming, so that web pages can be created in familiar tools such as DreamWeaver, PhotoShop and Illustrator, independently of the application code which supports them.

VisiRule Business Rules

VisiRule is an intuitive graphical tool for non-technical business users to design and deliver rule-based expert applications, simply by drawing a flowchart that represents the business decision logic.