4+ Free Speech-to-Text API Tools

Speechmatics offers advanced AI speech technology delivering high-accuracy, low-latency speech-to-text and text-to-speech services across 55+ languages. Designed for enterprises with global reach, it supports real-time transcription, multilingual conversations, and speaker diarization, enabling powerful voice AI agents and live captioning. The platform ensures enterprise-grade security with flexible deployment options including cloud, on-premises, and on-device.

AssemblyAI offers state-of-the-art speech-to-text and speech understanding AI models designed for developers to build, ship, and scale voice AI applications with high accuracy, multilingual support, and advanced features like speaker diarization and contextual prompting.

Vatis Tech is an AI-powered speech-to-text platform built for accuracy-critical use cases. Enterprises, contact centers, broadcasters, and legal teams use our API and transcription software to convert audio and video to structured text — at 99%+ accuracy, in 100+ languages. Standout capabilities include Romanian and EU

Transcribe Video to Text is a free, AI-powered video and audio transcription tool built for accuracy and ease. Upload any video or audio file (MP4, MOV, WebM, MP3, WAV, M4A, and 20+ more) and get a clean, accurate transcript in seconds — no software to install, no signup required to try. Key features: • 99% accuracy

Deepgram offers advanced voice AI solutions including speech-to-text, text-to-speech, and a unified Voice Agent API that integrates conversational AI with real-time transcription and natural voice synthesis. It supports over 36 languages with ultra-low latency, high accuracy, and customizable models tailored for industries like healthcare, customer support, and media. Trusted by enterprises and startups, Deepgram enables scalable, secure, and cost-effective voice AI experiences through flexible cloud and self-hosted deployments.