Google Cloud Text-to-Speech vs Spex-TTS
Google Cloud Text-to-Speech
cloud.google.comSpex-TTS
gandr.aiSide by side
| Figure | Google Cloud Text-to-Speech | Spex-TTS |
|---|---|---|
| Price from | $4/mo | $10/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Plans published | 14 | 6 |
| Spec score · Text-to-speech tools | 9.2 (#8) | 8.7 (#34) |
| Spec score · Text-to-Speech Software | 9.0 (#13) | 8.3 (#87) |
| API access | Yes | Yes |
| Export formats | MP3,LINEAR16,OGG_OPUS,MULAW,ALAW | ["WAV","raw PCM (pcm_s16le)"] |
| Free plan | No | Yes |
| Integrations | GetApp lists integrations including Cloud Vision API, YouTube, Unity and Studio. | The maker documents API access through REST, server-sent events, and WebSocket; no named third-party integrations are listed on the opened API page. |
| Platforms | web,api | ["web","api"] |
| Purpose | The API converts text into natural-sounding speech and can accept text or SSML input to produce audio data. | Spex-TTS is a text-to-speech engine that grew out of a production live-translation product. |
| Streaming | The product supports streaming audio synthesis for low-latency, real-time conversations. | The API offers complete WAV responses, HTTP server-sent event streams, and WebSocket audio streams. |
| Voice cloning | Yes | The API supports instant voice cloning from ten seconds of a consenting speaker’s audio, and the clone speaks 23 languages. |
Plans
Google Cloud Text-to-Speech
- Standard voices$4 a month
- WaveNet voices$4 a month
- Neural2 voices$16 a month
- Polyglot voices$16 a month
- Chirp 3: HD voices$30 a month
- Studio voices$160 a month
- Instant custom voice$60 a month
- Gemini 2.5 Flash TTS and Gemini 2.5 Flash-Lite Preview TTSPrice not published
- Gemini 3.1 Flash TTSPrice not published
- Gemini 2.5 Flash TTS / Gemini 2.5 Flash-Lite Preview TTSPrice not published
Spex-TTS
- FreeFree
- Take a Gandr$10 a month
- Pro$50 a month
- Scale / flat rate$150 a month
- Scale / flat rate$150 a year
- EnterprisePriced on request
In their own words
Google Cloud Text-to-Speech
Google Cloud Text-to-Speech is an API that converts text or SSML into audio data for applications. It offers more than 380 voices across more than 75 languages and variants, with REST or gRPC integration and output formats including MP3, LINEAR16, OGG_OPUS, MULAW, and ALAW. Gemini-TTS supports single- or multispeaker speech guided by natural-language prompts for style, accent, pace, tone, and emotional expression. Chirp 3 instant custom voice can create a personalized voice model from as little as 10 seconds of audio and is available in more than 30 locales. Streaming synthesis supports real-time conversations, while long-audio synthesis accepts up to 1 million bytes of input. Speech controls include pitch, speaking rate, and volume gain. Billing counts input characters, including spaces, newlines, and SSML tags except the mark tag, and billing must be enabled. Standard and WaveNet voices cost US$4 per 1 million characters, with 0 to 4 million characters free. Other voice models have different rates and free-use limits. New customers can receive $300 in Google Cloud credits.