← Text-to-Speech

Speechify

simba-3.2

Measured 2026-07-03

Naturalness

1573

Win % · 95% CI

63%

57–69%

Drift

7

Synth p50

345ms

345–375 p50–p90

Robustness

0.70

Fined:

• fatal · decimals — dropped the minus sign (7 of 7 transcripts)

→ we sent “Growth slowed to -0.5% this month.”

→ it said “Growth slowed to 0.5% this month.”

• minor · math operators — said “equal to” out loud; a prompt fixes this (4 of 8 transcripts)

→ we sent “Remember that 2+2=4 always.”

→ it said “Remember that two plus two equal to four always.”

Cost / 1M chars

$10.0

Vendor list (Starter tier); $6–8 per 1M at Pro/Scale volume.

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