Microsoft Office Add-ins
Development Services
MSOfficeAddin provides Microsoft Office add-in development services for Excel, Outlook, Word, PowerPoint, SharePoint, and Teams. We build cross-platform Office.js solutions, wire them into your CRM and ERP systems, and ship them through AppSource certification or Microsoft 365 admin center rollout. Most projects go live in 2 to 8 weeks.
Microsoft Office Add-ins Development
MSOfficeAddin builds custom Microsoft Office add-ins for Excel, Outlook, Word, PowerPoint, SharePoint, and Teams using Office.js and the Microsoft 365 platform. From CRM-integrated Outlook add-in workflows to financial-automation Excel tools, our certified developers deliver AppSource-ready, cross-platform solutions for enterprise teams across the US, UK, and Australia.
Excel Add-ins Development
MSOfficeAddin specializes in excel add-in development using Office.js, React, and TypeScript, building production-grade Excel extensions, data analysis tools in Excel, and automation add-ins for enterprise teams worldwide. From custom excel ribbon customization that puts your most-used business logic one click away, to API-connected task panes that pull live figures from your ERP without leaving the spreadsheet, every solution is cross-platform, AppSource-certified, and built to scale.
Outlook Add-ins Development
MSOfficeAddin builds custom outlook add-ins using Office.js, React, and TypeScript, from crm for outlook integrations that sync every customer interaction directly from the inbox, to email automation workflows and calendar add-ins that connect Microsoft 365 to your business systems. Whether you need a CRM connector, a support ticketing tool, a Teams-bridging solution, or a cross-platform enterprise deployment, we scope, build, and AppSource-certify it.
PowerPoint Add-ins Development
Custom PowerPoint add-in development for slide automation, branded presentation generation, and design system integration. We build AppSource-ready Office.js PowerPoint add-ins for enterprise consulting, sales, and marketing teams.
SharePoint Add-ins Development
Custom SharePoint add-in development and SPFx web part development for intranet automation, document management, and enterprise portal solutions. Specialist SharePoint developers for Microsoft 365 and SharePoint Online.
Teams Add-ins Development
MSOfficeAddin specializes in microsoft teams app development, building bots, custom tabs, and message extensions that bring your business tools into the workspace where your team already spends the day. With over 320 million monthly active users on Teams, embedding your workflows directly into the platform means faster adoption, fewer context switches, and automation that actually gets used.
Word Add-ins Development
MSOfficeAddin builds custom ms word add-ins using Office.js, React, and TypeScript, from legal clause libraries and contract generation to branded template management and CRM-connected document generation. Whether your team needs a ms word plugin for one-click proposal creation or a word add on that enforces compliance formatting, we ship production-ready Word extensions for law firms, financial institutions, and enterprise teams worldwide.
AI-Powered Office Add-ins
We build Office add-ins that integrate the OpenAI and ChatGPT APIs into Excel, Word, Outlook, and PowerPoint, so AI runs inside the apps your team already uses. Hire our developers to add GPT-powered formula help, writing assistance, slide generation, and email drafting without sending anyone to a separate tool.
Microsoft Copilot Extension Development
Microsoft 365 Copilot extensions let organizations customize Copilot with their own data, actions, and workflows through plugins and connectors. MSOfficeAddin is building this capability now, so if you are scoping a Copilot project, reach out early to discuss your requirements and timeline.
Office Add-in Integration Services
Connect your Office add-ins to SAP, Salesforce, Power BI, AI models, REST APIs, and enterprise systems. We build the integration layer so your data flows where your team already works.
Custom API Integration for Office Add-ins
Connect any REST, GraphQL, or SOAP API to your Excel, Outlook, or Word add-in. We handle auth, error handling, and data mapping so your add-in talks to any backend system.
AI Integration for Excel and Outlook Add-ins
Add Claude, ChatGPT, or any LLM directly inside Excel or Outlook. We build the add-in layer that sends data to AI models and returns results without leaving Microsoft 365.
SAP Integration for Excel and Outlook Add-ins
Pull SAP data into Excel or surface SAP records inside Outlook without switching systems. We build Office add-ins that connect directly to SAP via RFC, OData, or REST APIs.
Power BI Integration for Excel Add-ins
Surface Power BI datasets and visuals inside Excel add-ins so your team works with live data without leaving their spreadsheet. We build the connector, you own the workflow.
CRM Integration for Outlook and Excel Add-ins
Connect Salesforce, HubSpot, or Dynamics 365 to Outlook and Excel. We build CRM add-ins that log emails, sync contacts, and surface deal data without leaving Microsoft 365.
HubSpot Integration for Outlook and Excel Add-ins
Connect HubSpot CRM to Outlook and Excel without switching tabs. We build add-ins that surface contact timelines, log emails to HubSpot, and sync deal data directly inside Microsoft 365.
QuickBooks Integration for Excel Add-ins
Pull QuickBooks invoices, expenses, customers, and financial reports into Excel without exporting. We build Excel add-ins that connect to QuickBooks Online via API so your finance team works with live data.
Microsoft Graph API Integration for Office Add-ins
Microsoft Graph API is the single REST endpoint that connects every Microsoft 365 service, including mail, calendar, Teams, SharePoint, OneDrive, and users. Hire our Graph API developers to build the integrations, automation workflows, and webhook listeners that move that data into your apps.
Authentication & Identity
We build the authentication layer for Office add-ins, including Microsoft SSO, OAuth 2.0, Azure AD app registration, and multi-tenant identity. Your users sign in once and the add-in handles everything else.
Single Sign-On (SSO) Microsoft
We implement Microsoft Single Sign-On for Office add-ins so users authenticated in Microsoft 365 are automatically authenticated in your add-in. No separate login, no repeated prompts.
OAuth 2.0 Authentication for Office Add-ins
We implement OAuth 2.0 for Office add-ins connecting to Microsoft 365 or third-party APIs. Authorization code flow, PKCE, token caching, and refresh, built correctly for the Office.js environment.
Azure AD App Registration for Office Add-ins
We set up Azure AD app registrations for Office add-ins, including manifest configuration, Graph API permissions, redirect URIs, admin consent, and the Entra ID settings that most teams get wrong the first time.
Multi-Tenant Authentication for Office Add-ins
We build multi-tenant authentication for Office add-ins distributed to multiple enterprise customers. One codebase, per-tenant token isolation, and no manual configuration needed for each new customer tenant.
AppSource Publishing Services
We provide end-to-end Microsoft AppSource submission and certification support, from manifest preparation through reviewer communication and resubmission. We publish your Office add-in to the Microsoft marketplace so enterprise IT admins can deploy it across their organization.
Google Workspace Add-ons
Custom Google Workspace add-on development for Sheets, Docs, Gmail, and Drive. Professional Apps Script and REST API solutions for Google Workspace automation.
Google Sheets Add-ons
Custom Google Sheets add-ons for data automation, custom functions, and API integrations. Transform your spreadsheets into powerful business applications.
Google Docs Add-ons
Custom Google Docs add-ons for document automation, template management, and CMS integration. Spend less time formatting and more time writing.
Gmail Add-ons
Custom Gmail add-ons for email automation, CRM integration, and contextual workflow tools. Bring order to your inbox with professional Google Workspace solutions.
Google Drive Add-ons
Custom Google Drive add-ons for file management, workflow automation, and storage integration. Optimize how your organization stores, processes, and shares data.
Microsoft Ready
All our add-ins are developed following the official Fluent Design System and AppSourcecompliance guidelines.Request a security review.