Planatech Solutions

Home of XLL Plus.

XLL Plus

The XLL Plus Development Library is a toolkit that provides development tools and C++ class libraries that make it easy to generate Excel Add-in functions from your C and C++ code.

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XLL+ lets you create XLL add-ins for Excel, written completely in C++. Use XLL+ in Microsoft Visual Studio and you can have a fully-functioned Excel add-in working in minutes. There is no need to use the COM interface or write or to maintain any Visual Basic code at all.

Add-ins written in C++ perform faster than those written in VB. VB-authored add-ins often knock Excel over when they conflict with DDE updates. Add-ins written in C++ do not.

XLL+ opens up all the power of the Excel SDK, with little or no learning curve. Writing add-in libraries using the Microsoft Excel SDK is difficult and tedious. XLL+ makes it easy. The XLL+ toolkit creates and maintains all the code that links your add-in functions to Excel. If you've got libraries written in C or C++, you can have the Excel add-in version up and running in half an hour, with features like error-handling and caching built-in right away.

XLL+ functions can automatically cache their results, providing orders-of-magnitude performance gains over VB-authored functions.

XLL+ is used by most of the world's top investment banks, and many other leading engineering companies, manufacturers, universities, analysts and investment houses.

More details
Learn more about the features of XLL+ 7.0.
Trial version
Download a fully functional 30-day free trial of XLL+ version 7.0.

XLL Host

XLL Host is an administration and management tool for managing .xll addins on servers.

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XLL Host is intended for use where functionality contained in an Excel binary add-in (XLL) file is required by another application, on a platform where EXCEL itself cannot be used. The library exposes the add-in functions of the XLL as the methods of a .NET object.

You can find out more here.


SciIntegratorTM, co-developed with SciComp Inc., automates the process of generating Microsoft Excel, Java, .Net, COM or Python wrapper code, for derivative pricing models built in C-family source code, using SciFinance®.

Derivatives pricing models

SciFinance® is SciComp's ground-breaking software for building derivative pricing models.

You can find out more here.

Language Engine

Planatech's products and development projects make extensive use of our experience of many different development languages and environments. Much of our work is based around the proprietary technology of the Planatech Language Engine, PLE.

The Planatech Language Engine contains a rich object model of functions, APIs and human-computer interfaces, and a number of language modules which allow the engine to read existing code and to produce new code in a variety of languages.

It has been used by us and by our clients and partners to produce cheap and error free code, solving a variety of technology problems.

You can find out more here.


Planatech's approach to consultancy is not just to provide a solution to the immediate problem.

We take into account the client's business needs and provide constructive advice on whether it is a localised issue or has a wider scale impact.

We listen to the needs and advice of all groups of users and others affected, legal, regulatory and marketers.

We take the current infrastructure and in-house technological expertise into account.

Only then do we provide a solution that satisfies all criteria, has minimal systems impact and can therefore be reliably supported in-house. In all instances we provide training to key personnel where necessary.

You can find out more here.

Customer Support

If you have purchased a Planatech product, you can register your license here, and gain access to upgrades of commercial versions.

The links below will take you to the main areas of the site.

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