smallest.ai is a voice AI platform for building real-time speech systems, voice agents and production-grade audio applications, with low latency and enterprise scalability as the organising constraints.
Its models are specialised rather than general. Lightning handles fast text-to-speech at studio quality with multilingual output. Pulse covers real-time speech-to-text across more than 38 languages, with diarization and emotion detection. Hydra runs native speech-to-speech, built for full-duplex conversation that copes with interruptions and natural conversational flow. Electron is a small language model under 3B parameters.
Beyond the APIs there is an agent-building platform for launching voice agents in minutes. Teams can create agents, upload knowledge bases, manage campaigns, rent or connect phone numbers, configure retry logic, track versions and deploy at scale.
Compliance covers SOC 2 Type 2, ISO 27001, GDPR and HIPAA, which is what makes it usable for production voice workflows where security and reliability carry weight. A free tier is available.
Research basis: This is a source-based directory listing prepared from public product information; it is not represented as a hands-on test. Last updated September 20, 2026. Read our methodology.
Exact feature availability by plan was not specified in the source.
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