Spex-TTS

Plans and prices

Every plan, in full

On the record

Accuracy

The maker reports a 1.98% word error rate against a 2.17% human reference using the same scorer.gandr.ai · read 9 Oct 2026

API access

Yesgandr.ai · read 20 Sep 2026

API limits

The maker says there is no voice-management API; a voice reference is sent in the request, and the API example uses a ten-second recording.gandr.ai · read 9 Oct 2026

Consent limit

The maker requires users to have the reference speaker’s consent but says consent is not detected by the service.gandr.ai · read 9 Oct 2026

Export formats

["WAV","raw PCM (pcm_s16le)"]gandr.ai · read 20 Sep 2026

Expression controls

Numeric controls and inline transcript tags can steer speech expression, including timed breaks and spelled-out text.gandr.ai · read 9 Oct 2026

Integrations

The maker documents API access through REST, server-sent events, and WebSocket; no named third-party integrations are listed on the opened API page.gandr.ai · read 9 Oct 2026

Languages

23gandr.ai · read 20 Sep 2026

Languages

The maker says one cloned reference can be used across 23 languages.gandr.ai · read 9 Oct 2026

Performance

The maker reports first audio byte in 146 ms over the open internet and 116 ms p50 when the server is warm.gandr.ai · read 9 Oct 2026

Privacy

Customer text and reference audio never enter a training set, according to the maker.gandr.ai · read 9 Oct 2026

Purpose

Spex-TTS is a text-to-speech engine that grew out of a production live-translation product.gandr.ai · read 9 Oct 2026

Security claims

The maker’s site lists SOC 2 Type 2 infrastructure, HIPAA-Verified infrastructure, and GDPR-Ready infrastructure.gandr.ai · read 9 Oct 2026

Paid from

10gandr.ai · read 20 Sep 2026

Streaming

The API offers complete WAV responses, HTTP server-sent event streams, and WebSocket audio streams.gandr.ai · read 9 Oct 2026

Synthetic audio marking

Every generated sample carries an inaudible watermark that the maker says survives transcoding and cannot be skipped by configuration.gandr.ai · read 9 Oct 2026

Usage tracking

Usage is auditable per API key through GET /v1/usage.gandr.ai · read 9 Oct 2026

Voice cloning

The API supports instant voice cloning from ten seconds of a consenting speaker’s audio, and the clone speaks 23 languages.gandr.ai · read 9 Oct 2026

Alternatives to Spex-TTS

GC Google Cloud Text-to-SpeechAndroidiPhone & iPad+2 V VoiceboxAndroidiPhone & iPad+6 RA Resemble AIAndroidiPhone & iPad+7 T TypecastAndroidiPhone & iPad+2 N NaturalReaderAndroidiPhone & iPad+4 S SpeechifyAndroidiPhone & iPad+5 T TTSReaderAndroidiPhone & iPad+5 I iSpeechAndroidiPhone & iPad+6

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