Vocal Fatigue Detector
This free vocal fatigue detector lets you sustain a comfortable vowel and see how steady your voice is — pitch steadiness, jitter-like period perturbation, and shimmer-like loudness perturbation — combined into a 0–100 score. Capture a baseline at the start of a session and watch whether steadiness drops as you keep singing or speaking.
ℹ This is not a medical device and gives no diagnosis. It measures voice steadiness, which is related to but not the same as clinical jitter/shimmer (those need specialised pitch-synchronous analysis). The single most useful signal is change over a session — set a baseline, then watch for a drop — not any absolute number. Many things lower steadiness besides fatigue (technique, a noisy room, your mic, a cold). If you have persistent hoarseness, pain, or voice loss, rest your voice and see an ENT or speech-language pathologist. Your mic is analyzed live and never recorded or uploaded.
Hold a steady vowel…
Higher score = steadier. The dashed line marks your baseline; the green trace is your steadiness over time. Lower bands = less steady.
How It Works
When you hold a vowel, the tool tracks your pitch with a YIN detector and your loudness frame by frame over a rolling two-second window, then computes three steadiness measures. Pitch steadiness is the standard deviation of your pitch in cents — how much the note drifts. Period perturbation (jitter-like) is the average cycle-to-cycle change in the pitch period, and loudness perturbation (shimmer-like) is the average change in level. A tired or strained voice often becomes less stable — more wobble, more roughness — so these rise. Vocal fold fatigue from prolonged or forceful phonation is one common cause; others include dehydration, muscle tension, and suboptimal breath support. The three measures are blended into a single 0–100 steadiness score (higher is steadier). For a complementary look at the regularity of your pitch oscillations specifically, the voice vibrato analyzer measures vibrato rate, depth, and regularity from the same kind of sustained note.
Absolute values are noisy and depend on your mic, the room, and how you’re phonating, so the tool is built around relative change. Warm up, set a baseline, then keep singing or teaching and re-check: a clear drop from your own baseline is the meaningful signal. This is the same principle used in vocal hygiene self-monitoring — tracking your voice across a session rather than comparing to a population norm. For a singer, singer health monitoring like this can flag accumulated fatigue before it becomes an injury; for a teacher, tracking the teacher voice across a full school day helps identify when to ease back. This complements, but never replaces, how your voice feels and the advice of a professional. Persistent hoarseness, pain, signs of muscle tension dysphonia, or loss of range deserves a real evaluation by an ENT or speech-language pathologist. If you also want to track your usable pitch range across a session, the vocal pitch checker can show your current fundamental frequency in real time.