RSS Guard is simple, light and easy-to-use RSS/ATOM feed aggregator developed using Qt framework which supports online feed synchronization with these features: support for online feed synchronization via plugins, • Tiny Tiny RSS (RSS Guard 3.0.0+), • Nextcloud News (RSS Guard 3.1.0+), • Inoreader (RSS Guard 3.5.0+), • Gmail with e-mail sending (RSS Guard 3.7.1+). core: • support for all feed formats (RSS/RDF/ATOM/JSON), • full support of podcasts (RSS/ATOM/JSON), • import/export of feeds to/from OPML 2.0, • possibility of using custom 3rd-party feed synchronization services, • feed metadata fetching including icons, • simple internal Chromium-based web viewer (or alternative version with simpler and much more lightweight internal viewer), • scriptable message filtering, • downloader with own tab and support for up to 6 parallel downloads, • ability to cleanup internal message database with various options, • enhanced feed auto-updating with separate time intervals, • "portable" mode support with clever auto-detection, • feed categorization, • feed authentication (BASIC), • handles tons of messages & feeds, • ability to backup/restore database or settings, • fully-featured recycle bin, • multiple data backend support: SQLite (in-memory DBs too), MySQL, • ability to specify target database by its name (MySQL backend), • support for feed:// URI scheme. user interface: • message list filter with regular expressions, • drag-n-drop for feed list, • able to show unread feeds/messages only, • can be controlled via keyboard, • fully adjustable toolbars (changeable buttons and style), • hideable main menu, toolbars and list headers, • bundled icon themes (Numix & Papirus), • fully skinable user interface + ability to create your own skins, • newspaper view, • tabbed interface, • ability to hide list of feeds/categories, • desktop integration via tray icon, • localizations to some languages, • ability to tweak columns in displayed list of messages.