Detection approach
Speech Synthesis Voice Brand mismatch. Operating system voice libraries (speechSynthesis.getVoices()) contained voice packages belonging to a different platform (e.g. Microsoft-branded voices present while claiming a macOS environment). Real consumer platforms only ship native OS voices, exposing headless server setups or incorrect User-Agent configurations.
How this helps detect bots
Collect this signal alongside session context, request metadata, and other independent indicators. A single anomaly is a lead, not a verdict; corroborating anomalies make automated traffic more likely.
Legitimate traffic to consider
None. Consumer operating systems ship with platform-native text-to-speech voice packs.
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