Spex-TTS

6.8easy start · #62 of 216
in Text-to-Speech Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on api, Web. Paid plans from $10/mo.

Spex-TTS is ranked #62 of 216 in text-to-speech software on The Geeks Club. It runs on API, Web. There is a free plan. Paid plans start at $10/mo.

Spex-TTS plans and pricing

All plans

Free Free 50,000 tokens to start gandr.ai · 9 Oct 2026

Take a Gandr $10/mo Resets monthly 1 million tokens a month gandr.ai · 9 Oct 2026

Pro $50/mo Resets monthly 5 million tokens a month gandr.ai · 9 Oct 2026

Scale / flat rate $150/mo Per stream, per month, on annual 1 unlimited stream gandr.ai · 20 Sept 2026

Enterprise Not published 500 lines and up gandr.ai · 20 Sept 2026

Scale / flat rate $150/yr $150 per stream, per month, on annual; $180 month-to-month One unlimited stream · Unmetered gandr.ai · 9 Oct 2026

Compared on text-to-speech software

Free plan: Yes
Paid from: $10/mo
Voice cloning: Yes
API access: Yes
Languages: 23 languages
Export formats: ["WAV", "raw PCM (pcm_s16le)"]
Platforms: ["web", "api"]

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The record

Purpose: Spex-TTS is a text-to-speech engine that grew out of a production live-translation product.
Streaming: The API offers complete WAV responses, HTTP server-sent event streams, and WebSocket audio streams.
Expression controls: Numeric controls and inline transcript tags can steer speech expression, including timed breaks and spelled-out text.
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.
Performance: The maker reports first audio byte in 146 ms over the open internet and 116 ms p50 when the server is warm.
Accuracy: The maker reports a 1.98% word error rate against a 2.17% human reference using the same scorer.
Privacy: Customer text and reference audio never enter a training set, according to the maker.
Synthetic audio marking: Every generated sample carries an inaudible watermark that the maker says survives transcoding and cannot be skipped by configuration.
Consent limit: The maker requires users to have the reference speaker’s consent but says consent is not detected by the service.
Usage tracking: Usage is auditable per API key through GET /v1/usage.
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.
Security claims: The maker’s site lists SOC 2 Type 2 infrastructure, HIPAA-Verified infrastructure, and GDPR-Ready infrastructure.
Price from: $10/mo

Where it ranks on The Geeks Club

Best Text-to-Speech Software in 2026#62 of 216

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Sources

gandr.ai/product/spex-tts/· checked 9 Oct 2026
gandr.ai/product/text-to-speech-api/· checked 9 Oct 2026
gandr.ai/product/provenance/· checked 9 Oct 2026
gandr.ai/pricing/· checked 9 Oct 2026