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Sononym vs XO: catalog facts
Sononym	XO
Paid Sold as a paid license through the developer's purchase page.	Paid Costs $149 at list price or $9.99 a month for 15 months, with a free trial available.
Windows, macOS, Linux	macOS
Similarity search, including from live recordings Duplicate detection across sample libraries	Visual map of one-shot samples speeds up auditioning Works as a plugin or a standalone app
Paid license required Only browses samples; it is not a sampler or editor	Paid software, and the full expansion bundle is expensive Focused on drums and one-shots only
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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