Custom solutions for Microsoft Office, Internet Explorer, Outlook Express

Custom development services

Some years ago we started to provide custom development services to help our customers with their projects. Now we deliver all sorts of custom solutions, starting from research and project architecture and finishing with polished key-ready solutions for Microsoft Office and solutions for Internet Explorer.

Do you have a complicated project and immense requirements? Or, you don't have enough recourses and your deadline is short? Whatever your reason is, you have come to the right place. Engaging our custom development service, you will put your project into the right hands and will have it developed by true gurus who know all targeted applications inside out. These people have written tens of thousands of code lines for the most popular Microsoft Office applications, including Outlook, Excel, Word, PowerPoint as well as for Internet Explorer and Google Apps.

You probably have already heard about Add-in Express components for .NET, VSTO and VCL platforms. If not, cast a quick look at our development tools first, after that you may not need our custom development services :-)

In what way do we differ from other development companies?

We don't take on all types of projects, we offer services only in the fields that we are experts in. Having been in the software development industry for more than 10 years, our developers know Microsoft Office from A to Z and they can foresee and overcome all possible pitfalls that you may not be even aware of. But don't take our word for it, have a look at what our customers say. So, with our custom development services you will get:

A stable solution with a high quality code that works as intended by your special requirements, or even goes beyond your original expectations.

Areas of specialization:

Extensions types:

  • COM add-ins
  • Smart tags
  • Excel Real-Time Data servers
  • Excel User-Defined functions
  • Excel XLLs
  • Internet Explorer plug-ins
  • Google Apps add-ons

Programming languages:

  • Visual Basic .NET
  • Visual C#
  • Visual C++.NET
  • HTML/CSS/JavaScript
  • Google Apps Script


  • Microsoft Outlook
  • Microsoft Word
  • Microsoft Excel
  • Microsoft PowerPoint
  • Microsoft Project
  • Microsoft Visio
  • Microsoft Publisher
  • Microsoft MapPoint
  • Internet Explorer
  • Google Docs
  • Google Sheets

Payment models

We provide 2 schemes and you decide which one to choose. You can pay based on hour rates, depending on the complexity of your product rates vary from USD 75 to USD 100 per hour. Or, we can agree on the total cost and you pay after the work is done and accepted. Find more about payment schemes.

Considering handing your project to us?

Add-in Express custom development team did an excellent job for me

Tonio Rolle, Founder and Software Developer
CitationWare LLC

We'd be more than happy to recommend Add-in Express services to others

Matthew Larner

More success stories...

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