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PitchVis vs Audio Spectrum Analyzer: catalog facts
PitchVis	Audio Spectrum Analyzer
Free Free and open source under the MIT licence.	Free Free and open source under the Apache-2.0 licence, with no ads.
Android, Web	Android
Runs in the browser with nothing to install Android app available on F-Droid and Google Play	Logarithmic or linear frequency axis Useful for noise measurement, instrument tuning and timing sound events
Web version does not stop by itself; you close the tab to end it On mobile only the microphone can be used as input	Android only Measurement accuracy depends on the phone's microphone
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	No account needed
Not stated if it 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 2, 2026

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