Open Audio Analyzer is a free, open-source tool for measuring loudness and spectrum in live audio or files. It runs on Android, iOS, Linux, macOS, and Windows, with desktop measurements also viewable on a tablet over Wi-Fi. Fourteen arrangeable meter types cover loudness, true peak, VU, spectrum, spectrogram, oscilloscope, phase scope, histogram and more. Loudness readings follow EBU R 128 and ITU-R BS.1770-4, including momentary, short-term and integrated LUFS, loudness range, and oversampled true peak. Arrange meters across tabs and save layouts as presets, or use streaming and broadcast delivery targets and make custom ones. A command-line tool analyzes single files or album folders and produces readable reports or CSV. VST3 and Audio Unit plugins send measurements and DAW transport position to the app. The maker says audio is measured in memory and neither stored nor transmitted. The remote tablet display has no encryption or authentication, so the maker advises using it only on a trusted network.
Who it is for
It suits audio professionals or enthusiasts who need loudness and spectrum views for live sources or files, including command-line analysis. It may also suit DAW users and those who want to view measurements on a nearby tablet.
What is good
- Free and open-source across five platforms
- Fourteen arrangeable meter module types
- Supports EBU R 128 and ITU-R BS.1770-4
- CLI reports or CSV for files and folders
- Custom delivery targets and saved layouts
What to know first
- Remote display lacks encryption and authentication
- AAX plugin is not signed for released Pro Tools
Verdict
Open Audio Analyzer combines standards-based loudness measurement with flexible meters, file analysis, and DAW plugin support at no charge. Note the unsigned AAX plugin and use the remote display only on a trusted network.
Open Audio Analyzer plans and pricing
All plansCompared on audio analysis software
- Free plan
- Yes
- Real-time analysis
- Yes
- Offline file analysis
- Yes
- Loudness standards
- Yes
- Plugin support
- vst
- Analysis views
- loudness, true peak, VU, spectrum, spectrogram, oscilloscope, phase scope, histogram, loudness distribution, stereo cloud
