Custom Office 365 Add-In Development

Our team has 14 years of expertise creating custom add-ins for Excel, Outlook, and other Office applications to streamline processes, automate tasks, and boost efficiency.

We are here to assist you
Customized solutions
We tailor solutions for Excel, Word, PowerPoint, and Outlook within the Office 365 suite.
End-to-end support
Our team provides comprehensive assistance, from concept to deployment.
Trusted expertise
Backed by the success of XLTools, we bring proven knowledge in Office 365 development.
Ready to take the first step?

We're inviting you to a complimentary 30 minutes consultation. Let's discuss your idea or requirements, and explore how we can bring your custom add-in to life.

Don't let your great ideas remain just ideas. Let's turn them into functional, impactful Office 365 add-ins together.

Our services
Custom Add-In Development for Office 365

Designing and developing bespoke Office 365 add-ins for Excel, Outlook, Word, and PowerPoint that cater specifically to your business needs, whether for enhancing productivity, automating tasks, or integrating third-party services.

Migration from VBA to JavaScript

Transforming legacy VBA macros and scripts into JavaScript to leverage the full power of the Office JavaScript API, ensuring your solutions are scalable, secure, and integrated within the Office 365 platform.

Migration from VSTO to JavaScript

Expert migration services to transition your VSTO-based add-ins to modern, web-based JavaScript add-ins, enhancing cross-platform usability and future compatibility within the Office 365 ecosystem.

Custom UI/UX Design for Add-Ins

Designing intuitive and engaging user interfaces for Office 365 add-ins, tailored to your branding and user requirements.

Office Add-In Modernisation

Updating and modernising existing add-ins with the latest Office 365 features and best practices for security and performance.

Proof of Concept Development

Quick prototyping services to validate ideas for Office 365 add-ins before committing to full-scale development.

CI/CD and Deployment Automation

Implementing Continuous Integration/Continuous Deployment pipelines for efficient and reliable add-in updates and releases.

Secure Code-Signing Services

Providing code-signing services to ensure the integrity and security of your custom Office 365 add-ins.

Office 365 Integration Services

Integrating third-party services and APIs with Office 365 to create a seamless workflow within Office applications.

Dedicated Maintenance and Support

Offering ongoing maintenance and support services to ensure your Office 365 add-ins remain up-to-date and perform optimally.

Market Entry and Distribution Strategy

Assistance with launching your Office 365 add-in, including marketplace listing, distribution strategies, and go-to-market support.

How it works

Our business analyst collect, analyze and structure your functional and nonfunctional requirements. This stage is followed with a detailed solution development roadmap.


Based on the deliverables from the business analysis phase, our team builds wireframes and prototypes to assess software feasibility and get early feedback.


Develops tailor-made solutions following the best of Agile principles, breaking down the process into short iterations with quick deliverables.

QA & Testing

We couple our product development process with continuous quality assurance and testing to check software performance and behavior, as well as assessing the functional health of all software components.

Maintenance & Support

We offer diversified levels of software maintenance and support depending on your needs, solving a variety of challenges such as software upgrades and functional improvements, performance monitoring, and more.

Let’s innovate together -
Get started now

Have a vision? We're here to make it happen. Share your idea with us, and let’s explore groundbreaking solutions together. Your innovation journey starts here.

Success stories

Office 365 add-ins are software extensions that enhance the functionality of Office applications. They can automate tasks, integrate third-party services, and improve productivity, allowing your team to focus on high-value activities.

Unlock a free 30 minutes consultation today!

Discover how custom Office 365 add-ins can transform your workflow. Book your free consultation now and take the first step towards unparalleled efficiency.