Engineering teams face the decision of whether to build or buy API documentation tools, balancing factors such as customization, engineering bandwidth, and maintenance needs. Building in-house offers complete control and flexibility but demands significant investment in search, AI integration, and user interface components, while buying provides immediate functionality and efficiency at the expense of some customization. Leaders in the field, like Jamie Barton, Vijay Iyengar, and Mary Torres, share experiences that highlight the advantages and challenges of both approaches, emphasizing the importance of technical documentation as a key differentiator for companies. Building in-house can provide superior customization and infrastructure control, but it often unveils complexities that require ongoing investment, such as scalable search, AI-integrated chat, and detailed UI elements. Buying off-the-shelf solutions can save engineering hours with features like AI chat, version control, and interactive API playgrounds, though it involves ongoing subscription costs. The choice between building and buying depends on specific team context, documentation requirements, and available resources, with many teams finding success in hybrid approaches that combine custom components with existing platforms.