Free Voice & Speech AI Tools

NobodyWho is an open-source, on-device inference library and SDK that runs text, vision, and speech models (LLM, STT, TTS) locally across platforms, emphasizing performance, privacy, and offline use.

PreCallAI is a developer-first, production voice agent platform that orchestrates streaming STT → LLM → TTS call pipelines while letting customers bring their own provider keys and pay flat monthly plans (no per-minute billing).

Callin.io is an enterprise-focused white-label AI voice platform that provides ultra-low latency voice AI (Neuron 1.0) and autonomous AI agents for industry-specific conversational automation, built for rapid deployment and enterprise security.

Synthflow is an enterprise-grade, end-to-end Voice AI platform that designs, deploys, and operates AI voice agents for inbound and outbound phone automation, combining a visual flow builder, in-house telephony, testing and monitoring, and deep integrations for B2B use cases.

Bland is an enterprise voice AI platform that builds, runs, and monitors production phone agents for regulated industries (healthcare, insurance, financial services, logistics), running on customer-controlled infrastructure and designed for high-security, high-stakes phone calls.

Relyable is a simulation and monitoring platform for AI voice agents that generates realistic test conversations, evaluates every call against customizable rubrics, and monitors live production calls with real-time alerts to help teams ship high-performing voice agents faster.

Vogent Voicelab is a public-beta, high-quality text-to-speech platform and API that hosts state-of-the-art voice models (e.g., Sesame CSM-1B, Dia, Chatterbox, Orpheus), offering ultra-fast real-time inference, zero-shot voice cloning, hosted fine-tuning, and scalable deployment (including on-prem/VPC) for developers and enterprises.

Deepgram provides enterprise Voice AI APIs — real-time and batch speech-to-text (STT), text-to-speech (TTS), audio intelligence, and unified Voice Agent capabilities (including LLM orchestration) for developers, platforms, and enterprises.

Murf AI is an end-to-end AI voice platform providing production-grade text-to-speech APIs (Murf Falcon), a Studio for fast voiceover creation, and AI dubbing and agent solutions to build scalable conversational voice agents and localized audio content.

Speechify is a cross-platform Voice AI productivity assistant that provides text-to-speech, AI voice generation, voice typing (dictation), voice cloning, dubbing, and developer APIs to read, write, summarize, and create audio content across web, desktop, and mobile devices.

ELSA Speak is an AI-powered English speaking coach (mobile app and B2B/Schools offerings) that provides personalized lessons, real-time pronunciation feedback, role-play conversations, and progress tracking to help learners improve fluency and confidence.