Vega XML Editor & Validator
A native macOS XML editor built for real documents - multi-megabyte files, live XSD validation, and a tree outline that never freezes while you work.
A native macOS XML editor built for real documents - multi-megabyte files, live XSD validation, and a tree outline that never freezes while you work.
Sitemaps with forty thousand entries. SVGs the size of a novel. XLIFF files no preview pane survives. Vega is built for those.
The outline is a flat, virtualized list - not nested SwiftUI DisclosureGroups - so a sitemap with 40,000 <url> siblings opens in seconds. Nodes with many children reveal in pages of 200, and parsing runs in the background so the window never freezes.
Drop in an .xsd file and Vega validates against it live, using libxml2 under the hood. Errors surface inline on the offending tree node, plus a panel that lists every problem with line numbers. Each edit triggers a debounced re-validation.
Save the schemas you use over and over - sitemap, SVG, XLIFF, custom company formats - into a personal library. The library remembers which schema goes with which document, so the next time you open it, validation is already running.
Click a node to see its attributes in a sortable table, edit its name and value inline, manage attached comments, and switch the node's kind. Elements, text, CDATA, comments, and processing instructions are all first-class.
Drag any element to a new parent. Duplicate, delete, and reorder with a single context menu. Every operation is undoable - up to 50 steps deep - so experiments are never destructive.
The search field scans element names, text content, and attribute names and values across the entire document. Matches highlight in the outline; validation errors filter alongside. Debounced and cached so even multi-megabyte documents stay fluid as you type.
Vega registers as an Editor for .xml and .xsd files, so "Open With → Vega XML" works from Finder. Drop a schema on the app icon and it lands directly in your library.
Native NavigationSplitView layout. Standard macOS toolbar, search field, and menu commands. Full keyboard support. Sandboxed; the only network calls Vega makes are to URLs you explicitly type into the Schema Library to import an XSD.
Vega does not send your documents anywhere. Your Schema Library lives in your private iCloud (CloudKit) container so it follows you between your Macs; nothing is shared with us or anyone else. No analytics SDK, no account, no sign-in.
Web developers debugging sitemaps and RSS feeds. Localization engineers working with XLIFF. Designers editing SVG. System integrators reviewing API responses. Anyone who has ever opened a 50 MB XML file and watched their previous editor freeze.
Vega is the fifth-brightest star in the night sky and one of the steadiest reference points astronomers have. The editor that bears its name aims to be just as steady when you're staring at a fifty-megabyte XML file.