Compare TTS engines on coaching text across grade bands.
Metrics: UTMOS (naturalness, ↑ better) · WER (intelligibility, ↓ better) · RTF (speed, ↓ better) · Cost vs Chirp 3 HD
TTS Engine
Grade Band
Voice (Kokoro only)
Defaults to recommended voice for selected band. Override freely.
Comparison Table
↑ higher is better · ↓ lower is better — WER may exceed 100% on short texts.