Gradium
Gradium provides a suite of modular audio language models for real-time speech synthesis and transcription, enabling developers to build natural, low-latency voice experiences. The platform offers streaming TTS and STT, instant voice cloning, multilingual support, and an open on-device TTS model called Phonon. Its credit-based subscription plans scale from free prototyping to enterprise-grade workloads.
- Artificial Intelligence
- Developer Tools
- Software Only
Funding
Raised to date
$100MRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
across 2 rounds
DGESN+1$30M · Seed Extension
Announced Jul 2026
Disclosed cumulative: $100M
Founders
Product
Problem
Real-time voice applications require low-latency, high-quality speech synthesis and transcription, but existing services often suffer from noticeable lag, limited language coverage, and high operational costs, making scalable deployment difficult for developers and enterprises.
Solution
Gradium offers a suite of modular audio language models that deliver natural, expressive speech synthesis (TTS) and accurate, streaming transcription (STT) with ultra-low latency suitable for interactive voice agents. The models run via a cloud API that supports real-time streaming inference, enabling developers to integrate voice capabilities without managing complex infrastructure. Instant voice cloning lets users create custom speaker profiles on demand, while word-level timestamps provide precise alignment for downstream processing. Multilingual support (English, French, German, Spanish, Portuguese) and robust performance in noisy environments broaden applicability across global markets. A credit-based subscription model scales with usage, allowing both prototyping and enterprise-grade workloads.
Target Audience
The primary customers are developers and product teams building voice-enabled applications—such as conversational agents, gaming NPCs, customer-support bots, and language-learning platforms—and enterprises that need scalable, low-latency speech AI for production deployments.
Features
- Modular audio language models for independent TTS, STT, or combined voice pipelines
- Streaming inference with controllable latency for real-time interaction
- Instant voice cloning with up to 1,000 clones per plan and unlimited in custom tiers
- 48 kHz high-fidelity audio output and word-level timestamps for exact text-audio alignment
- Semantic voice-activity detection for smart turn-taking and reduced background noise impact
- Code-switching and multilingual support (EN, FR, DE, ES, PT) with seamless language detection
- RESTful API with configurable concurrency limits (2–15 concurrent streams per plan)
- Credit-based pricing that maps usage to TTS hours, STT hours, and model concurrency