Newspipe is a self-hosted web news aggregator (RSS/Atom feed reader) built with Flask. It provides a full-featured reading experience with multi-user support, two-factor authentication, role-based access control, and a RESTful API. The system fetches feeds asynchronously using asyncio, sanitizes content against XSS, and guards against SSRF via IP pinning. It supports categories, bookmarks, tags, notes, search, infinite scroll, and a resizable reading pane. Data can be imported/exported in OPML and JSON formats, and it integrates with Pinboard for bookmark import. The frontend uses Bootstrap 5, Chart.js, and Luxon for relative dates, with i18n support for English, French, and German. The architecture follows a layered pattern: Flask blueprints for views, controllers for data access (with a generic AbstractController), SQLAlchemy models, and utility libraries for security and data handling. The crawler is a separate async module that can be invoked via CLI or cron. The codebase demonstrates strong security practices (CSP, CSRF, safe redirects, input sanitization) and includes unit tests for security-critical components. While the project is well-structured and actively maintained, there is a known bug where non-admin users with API access cause a 500 error on article updates due to a tag association proxy issue.