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DiffMerge vs SmartSynchronize: catalog facts
DiffMerge	SmartSynchronize
Free Free to use under SourceGear's freeware license.	Paid Prices are not listed on the product page; licensing details are on the syntevo site.
Windows, macOS, Linux	Windows, macOS, Linux
Two-way diff and three-way merge with editable panes Side-by-side folder comparison	Editable file compare with inner-line change detection 3-way merge with all three files editable
Closed source freeware Infrequent updates	Pricing is not shown on the product page Focused on text files and project trees rather than general backup
Downloadable app	Downloadable app
Closed source	Closed source
License: Freeware	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.