On a Hack Friday in September 2022, DeepL software developer Marvin Becker and developer evangelist Tim Cadenbach built a prototype DeepL API add-in for Microsoft Word, making it possible for users to translate with DeepL directly in a Word document. We often hear requests from customers who want to build their own Office Add-in with the DeepL API and are looking for resources to get started. Tip 1: Building a prototype with Script Lab (or use ours)Script Lab is an open-source project maintained by Microsoft. You’ll also need a DeepL API key if you'd like to follow along with this step. While Mac support is quite good for .NET Core development, it’s still not good enough for core Windows development—including Microsoft Office apps.