Sold by: Gradium
Deployed on AWS
A voice AI platform delivering real-time Text-to-Speech, Speech-to-Text, and instant voice cloning through streaming WebSocket APIs. Build low-latency voice agents in English, French, German, Spanish, and Portuguese with a single API key.
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Overview
Gradium SaaS is a voice AI platform for developers and product teams building natural, expressive spoken experiences. The service exposes streaming WebSocket APIs for Automatic Speech Recognition (ASR) and Text-to-Speech (TTS) in English, French, German, Spanish, and Portuguese, plus instant voice cloning from a short audio sample. Typical use cases include conversational voice agents. The service runs entirely on AWS infrastructure managed by Gradium; buyers require no additional GPUs, self-hosted models, or third-party services, and there are no costs beyond the Marketplace subscription dimension selected.
Highlights
- Real-time streaming (WebSocket)
- TTS, STT, and instant voice cloning
- 5 languages (EN, FR, DE, ES, PT)
Details
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Features and programs
Financing for AWS Marketplace purchases
AWS Marketplace now accepts line of credit payments through the PNC Vendor Finance program. This program is available to select AWS customers in the US, excluding NV, NC, ND, TN, & VT.
Pricing
Pricing is based on the duration and terms of your contract with the vendor, and additional usage. You pay upfront or in installments according to your contract terms with the vendor. This entitles you to a specified quantity of use for the contract duration. Usage-based pricing is in effect for overages or additional usage not covered in the contract. These charges are applied on top of the contract price. If you choose not to renew or replace your contract before the contract end date, access to your entitlements will expire.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
Dimension | Description | Cost/month | Overage cost |
|---|---|---|---|
L base plan | The base credit of the L plan | $1,665.00 |
Dimensions summary
This listing offers one pricing dimension: the L base plan, sold as Units of credit under a contract. You buy the plan's base credit allotment, and those credits fund your usage of the voice AI models. Credits convert into usage by activity type, so the same credit balance covers different services at different rates. Text-to-speech draws credits per character, while speech-to-text and translation services draw credits per second at their own rates. Your billing is a single committed credit amount rather than separate charges per service.
Top-of-mind questions for buyers
Credits convert by activity type. Text-to-speech draws 1 credit per character, where about 45,000 characters equals one hour of audio. Speech-to-text draws 3 credits per second. Speech-to-text translation draws 4 credits per second. Speech-to-speech translation draws 30 credits per second. Each service consumes your shared credit balance at its own rate.
Speech-to-speech translation consumes credits fastest at 30 credits per second, roughly 100,000 credits per hour. Speech-to-text translation uses 4 credits per second, and speech-to-text uses 3 credits per second. Text-to-speech uses 1 credit per character. All services draw from the same credit balance, so your mix of activities drives depletion.
The pricing table sets a base credit amount for the L plan under a contract. The vendor's public materials list this scenario in their FAQ but do not state the outcome in the crawled content. Contact the vendor to confirm how additional usage beyond your credit balance is handled.
gradium.ai
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No refund policy
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Delivery details
Software as a Service (SaaS)
SaaS delivers cloud-based software applications directly to customers over the internet. You can access these applications through a subscription model. You will pay recurring monthly usage fees through your AWS bill, while AWS handles deployment and infrastructure management, ensuring scalability, reliability, and seamless integration with other AWS services.
Resources
Vendor resources
Support
Vendor support
AWS infrastructure support
AWS Support is a one-on-one, fast-response support channel that is staffed 24x7x365 with experienced and technical support engineers. The service helps customers of all sizes and technical abilities to successfully utilize the products and features provided by Amazon Web Services.
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Customer reviews
Sebastien L.
Gradium Delivers Natural, Low-Latency Voice Synthesis with Easy Integration
Reviewed on Nov 02, 2026
Review provided by G2
What do you like best about the product?
What I like most about Gradium is the combination of high-quality, natural-sounding voice synthesis, low latency, and ease of integration.
As an AI developer, I particularly appreciate how Gradium makes it possible to build real-time, voice-driven experiences that feel genuinely conversational rather than robotic.
As an AI developer, I particularly appreciate how Gradium makes it possible to build real-time, voice-driven experiences that feel genuinely conversational rather than robotic.
What do you dislike about the product?
There’s honestly very little to dislike about Gradium so far. One area for improvement would be expanding the flexibility and customization of voices, particularly when it comes to fine-tuning emotions, tone, and speaking styles and also more languages ;)
What problems is the product solving and how is that benefiting you?
Gradium helps us overcome one of the biggest challenges in building conversational AI experiences: delivering natural, expressive voice interactions with minimal latency.
At Gensai, we develop interactive AI solutions for museums, events, brands, and intelligent assistants, where responsiveness and voice quality are essential to creating engaging experiences.
Gradium allows us to build more fluid, human-like conversations while reducing the technical complexity of integrating high-quality speech synthesis.
Its potential for on-device deployment is particularly valuable for installations where connectivity, privacy, and reliability are important.
Ultimately, Gradium helps us focus more on designing innovative AI experiences and less on solving the underlying voice technology challenges.
At Gensai, we develop interactive AI solutions for museums, events, brands, and intelligent assistants, where responsiveness and voice quality are essential to creating engaging experiences.
Gradium allows us to build more fluid, human-like conversations while reducing the technical complexity of integrating high-quality speech synthesis.
Its potential for on-device deployment is particularly valuable for installations where connectivity, privacy, and reliability are important.
Ultimately, Gradium helps us focus more on designing innovative AI experiences and less on solving the underlying voice technology challenges.
Léo B.
Authentic Multilingual Voices and Strong Data Protection with Gradium
Reviewed on Oct 30, 2026
Review provided by G2
What do you like best about the product?
Gradium's voices are really authentic, including in other languages than English. We use it a lot with French language, and the quality is amazing. We also deeply appreciate the data protection Gradium offers.
What do you dislike about the product?
Gradium is a young company, so changes in the API and the products happen often which can be both great and sometimes frustrating. For instance, voices that we use can become depreciated, but new ones come regularly.
What problems is the product solving and how is that benefiting you?
Gradium offers state of the art voices that our users (students and teachers) manipulate. It is perfect for high-quality data-sensitive platforms.
Anonymous
Natural-Sounding Voices, Backed by a Responsive Team
Reviewed on Oct 29, 2026
Review provided by G2
What do you like best about the product?
I like that Gradium’s voice has a very natural touch. The team is very innovative and implements feedback quickly.
What do you dislike about the product?
I’d like a voice-to-voice model.
What problems is the product solving and how is that benefiting you?
I use Gradium for our voice AI agents.