01
Analyze Voice
Pitch, formants, intensity, and harmonicity measured from the signal and drawn over it. Values are validated against Praat's own routines.
Free and open-source · Browser and desktop
Phonetics software that runs in your browser
Phonia is a phonetics workstation for recording, annotating, and measuring speech, built to replace Praat for everyday research tasks. The analysis engine is written in Rust, compiled to WebAssembly for the browser build; a desktop build runs the same engine offline. Pitch, formant, and intensity measurements are checked against Praat under matched settings.
Capabilities
Five capabilities.
02
Manage Audio
Import audio files or record from the microphone, and organize a corpus of recordings into projects with groups, tags, and search.
rec_2024-05-12.wav
interview_a3.wav
wordlist_deny.wav
03
Show Spectrograms
Formant and pitch tracks drawn over the signal, with a choice of built-in color scales or a custom gradient.
04
Annotate Recordings
Tiered intervals over the signal. Create boundaries by listening, nudge them by the sample, and export TextGrids.
05
Draw Plots
Pitch contours and formant tracks exported as SVG, PDF, TikZ, Typst, or Vega-Lite, or as plotting code for Python, R, and Julia.
Learning
One set of conventions.
The command palette (Ctrl/Cmd-K) lists every action with its keyboard shortcut. One undo stack (Ctrl/Cmd-Z) covers every kind of edit, and one selection model runs across the waveform, the spectrogram, and the annotation tiers.
Validation
Checked against Praat.
Praat is the standard tool in phonetics research and teaching. Phonia's pitch, intensity, and formant measurements are compared against a Praat oracle under matched settings, each with a documented tolerance band. A continuous-integration job re-runs the comparison on every change; a measurement drifting past its tolerance fails the build.
Most formant checks agree exactly; the remaining residual traces to Praat's own unpublished sinc-interpolation window, and is recorded in the repository's validation notes. Voice-report measures — jitter, shimmer, and harmonicity — are checked on sustained-vowel cases.
| Measure | Praat routine | Status |
|---|---|---|
| Pitch (F0) | Sound: To Pitch (ac) | Validated |
| Formants F1–F3 | Sound: To Formant (burg) | Validated |
| Intensity | Sound: To Intensity | Validated |
| Harmonicity | Sound: To Harmonicity (ac) | Validated |
Routine names as they appear in Praat.
The application
Embedded below.
The frame below loads the same build served at this site's root.
phonia — live
Open Phonia to see it live.
Open Phonia