Accuracy
Numbers you can cite.
Every measure ships with a documented tolerance against Praat, and a drift outside its band stops the release.
5measures
132cases
CIenforced every change
Speech analysis workspace
See what you hear.
Pitch, formants, and intensity, measured from the signal and drawn straight over the waveform and spectrogram. Free and open source.
Start analysing
Runs locally — nothing is uploaded.
Capabilities
Record, measure, annotate, and plot.
Reproducibility
Export the figure itself.
Every plot exports as a real document or a real program — a vector figure, a TextGrid, or plotting code that regenerates the same chart from the same data.
SVGPDFTikZTypstVega-LitePythonRJulia
See an export →
01
Analyse voice
Pitch, formants, intensity, and harmonicity measured from the signal and drawn over it, updating as you scrub the timeline.
02
Organise recordings
Import audio files or record from the microphone, and organise a corpus of recordings into projects with groups, tags, and search.
rec_2024-05-12.wav
interview_a3.wav
phonia_001.wav
03
Read the spectrogram
A wideband spectrogram with a choice of built-in colour scales or a custom gradient, formant and pitch tracks drawn to scale over the signal.
04
Annotate recordings
Tiered intervals over the signal. Create boundaries by listening, nudge them by the sample, and export TextGrids.
05
Draw plots
A vowel chart or a formant track, styled and labelled, with a colour scale picked to match the rest of the workspace.
06
Batch and compare
Open several recordings side by side, keep the same analysis settings across them, and export every figure in one pass.
Validation
How the numbers are checked.
Praat is the standard tool in phonetics research and teaching. Phonia runs the same recordings through Phonia and Praat under matched settings and holds each measure to the tolerance band on the right.
Most formant checks agree exactly; the remaining residual comes from Praat's own sinc-interpolation window and is recorded in the repository's validation notes. Voice-report measures — jitter, shimmer, harmonicity — are checked on sustained-vowel cases.
132 paired cases run on every change; a drift outside any band stops the release.
| Measure | Praat routine | Tolerance band |
|---|---|---|
| Pitch (F0) | Sound: To Pitch (ac) | ≤ 1% relative |
| Formants F1–F3 | Sound: To Formant (burg) | ≤ max(50 Hz, 3%) |
| Intensity | Sound: To Intensity | ≤ 1 dB |
| Harmonicity | Sound: To Harmonicity (ac) | ≤ 1 dB, voiced |
| Jitter / shimmer | PointProcess (periodic, cc) | ≤ 10%, sustained vowels |
Routine names as they appear in Praat; bands from the validation notes.
Open source
Phonetics in your browser.
The analysis engine compiles to WebAssembly for the browser and natively for the desktop app. The source is public, the license is permissive, and everything runs on your own machine.
- Dual-licensed under MIT and Apache-2.0
- One analysis engine, compiled to WebAssembly and to native code
- No account and no connection required; recordings stay on the machine
By platform
Pick the machine, keep the engine.
Browser
Zero install. Open the site, drop in a file, measure — and send a collaborator the exact same view with a link, no export step first.
Share a link
Desktop
Offline by default, with system file access and a batch mode: point it at a folder overnight and come back to a corpus of measurements.
Batch a folder overnight
Mobile
Record and get a first read in the field — pitch and level at a glance — then open the same file at the desk for the full workspace.
Measure in the field
The workspace
The workspace, open on a sample recording.
phonia_001, loaded and ready to explore.
Phonia — phonia_001
Opening the workspace