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