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Oxygen XML Developer vs XML Notepad: catalog facts
Oxygen XML Developer	XML Notepad
Paid Commercial licence, with a free trial available.	Free Free and open source under the MIT licence.
macOS	Windows
XSLT and XQuery debuggers Visual XSD and JSON Schema diagrams	Tree view synchronized with node text editing Imports CSV, JSON and HTML as XML
Paid licence after the trial Large feature set takes time to learn	Windows only Focused on XML rather than general text editing
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.