Smallest.ai is a San Francisco-based voice AI company building small, efficient multimodal models and an agentic platform for real-time voice applications. Its product lineup includes Lightning (text-to-speech with ~100ms latency across 15+ languages), Pulse (speech-to-text in 38 languages with emotion and speaker detection), Electron (a sub-3B-parameter language model), and Hydra (native speech-to-speech). The platform supports voice cloning and agent configuration, with APIs and documentation for developers, and maintains SOC 2, GDPR, and HIPAA compliance. In 2025 the company raised an oversubscribed $8M seed round led by Sierra Ventures with 3one4 Capital and others.
Smallest.ai
ActiveFast, efficient real-time voice AI models and an agentic platform
Total raised
$8M
1 round
Stage
Seed
Team
11-50
since 2024
Pricing
Freemium
free plan
Founded
2024
San Francisco, United States
Agent-ready
API
Score 55/100
Lightning text-to-speech with ~100ms latency
Pulse speech-to-text in 38 languages
Hydra native speech-to-speech model
Electron sub-3B small language model
Voice cloning capabilities
Agent configuration platform
Emotion and speaker detection
REST API and developer docs
55/100
Developing
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
— Seed $8M incl. 3one4 Capital +1
Capital network
$8M raised ·2 backers·10 network links
- Backers2
- Shared portfoliocompanies these backers also fund
- Extended networkfunds that co-invest alongside them
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- What does Smallest.ai do?
- It builds efficient real-time voice models for text-to-speech, speech-to-text, and speech-to-speech, plus an agent platform.
- How low is the latency?
- Its Lightning TTS model targets around 100ms latency across 15+ languages.
- Does it offer an API?
- Yes, with documentation at docs.smallest.ai and SDK examples.
- How much has Smallest.ai raised?
- It raised an $8M seed round led by Sierra Ventures in 2025.
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