Provide a detailed summary of the following web content, including what type of content it is (e.g. news article, essay, technical report, blog post, product documentation, content marketing, etc). If the content looks like an error message, respond 'content unavailable'. If there is anything controversial please highlight the controversy. If there is something surprising, unique, or clever, please highlight that as well:
Title: Show HN: We built an open-source OAuth service for 40 APIs
Site: www.nango.dev
Nango vs. Passport or NextAuth: Passport & similar libraries focus on OAuth for single sign on (SSO). They don't store tokens, don't refresh them, don't encrypt them etc. Nango focuses on using APIs with OAuth. It provides pre-built flows, secure token storage and management in one. Nango vs. OAuth libraries: Nango is built on top of OAuth libraries: It adds a web server to handle the dance, pre-built configurations for 40+ APIs, secure token storage & refresh etc. You will be faster and more secure using Nango than building with an OAuth library.