Accent Frequency Profiler — Live Vowel Formant Chart (F1/F2)
Speak naturally and watch where your vowels land in F1/F2 formant space. The tool builds a vowel formant chart — a density map of your vowel sounds — over a chart of reference vowels.
ℹ This is a vowel-space footprint, not an accent identifier. It cannot name, score, or “correct” an accent — accents differ in subtle formant shifts, consonants, rhythm, intonation and word choice, and reliable accent ID needs trained models and large datasets. It simply shows where your vowels sit, useful for self-study alongside a coach. Formants are LPC estimates and depend on your voice and mic. Your mic is analyzed live and never recorded or uploaded.
F2 (front–back) across, F1 (open–close) down. Brighter cells = more of your speech landed there. Cyan dots are adult-average reference vowels.
How It Works
While you speak, the tool estimates the first two formant frequencies (F1, F2) of each voiced moment using linear predictive coding (LPC) — the same vocal-tract-resonance method as our Vocal Formant Frequency Analyzer. Each estimate is one point in vowel space (F2 left-to-right, F1 top-to-bottom), and the points accumulate into a density map: the brighter a cell, the more often your vowels landed there. Over a paragraph this paints a footprint of your vowel sounds, which you can compare with the adult-average reference vowels plotted on the chart — a standard acoustic phonetics representation called the IPA vowel quadrilateral. Everything runs live on your device; nothing is recorded.
A footprint is not an accent. Accents are carried by far more than vowel positions — consonant articulation, coarticulation effects, rhythm and timing, intonation, stress, and vocabulary — and the same speaker shifts vowels with context and emphasis. Even where accent formants do differ systematically between dialects, those shifts are subtle and overlap heavily between speakers, so a live speech formant map is useful for exploration, not identification. Absolute formant values also scale with vocal-tract length (so higher voices and children read higher F1/F2 values) and are coloured by your mic. Use this to see and explore your own vowels, not to label, grade, or “fix” an accent; for accent work, pair it with a qualified speech-language coach. You can monitor overall pitch tendency alongside vowels with the Vocal Pitch Checker.