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dcm2niix vs XMedCon: catalog facts
dcm2niix	XMedCon
Free Free and open source; most of the code is covered by a BSD license.	Free Free software released under the GNU GPL version 2 or later.
Windows, macOS, Linux, Command line	Linux, Command line
Converts DICOM scans to NIfTI Can generate BIDS JSON sidecars	Converts several medical imaging formats GPL-licensed toolkit
Does not support some legacy image formats handled by dcm2nii	Focused on medical image conversion formats and workflows.
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: GPL-2.0-or-later AND LGPL-2.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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