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

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