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Open Sound Meter vs AUDio MEasurement System: catalog facts
Open Sound Meter	AUDio MEasurement System
Freemium The desktop Community version is free; the iPad app is sold separately on the App Store.	Free Free and open source under GPL-2.0 or GPL-3.0.
Windows, macOS, Linux, iOS	Windows, macOS, Linux
Full measurement set in the free version Cross-platform desktop builds	Includes a tone generator, oscilloscope and spectrum analyzer Can plot frequency response and display harmonic distortion
iPad version is paid Aimed at audio professionals rather than casual users	Requires a computer sound card
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

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