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3+ Free Speech-to-Text API Tools

4 of the 5 tools in this category have a free plan. Each offers a free tier beside paid plans.

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Multilingual Transcription5Transcription5Speaker Diarization4Speech Analytics4Speech Recognition4Meeting Transcription3
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Speech-to-Text API tools with a free plan

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Freemium5.0(1)
Speech-to-Text API

Speechmatics

Accurate, secure, and scalable AI-powered speech-to-text and text-to-speech APIs for global voice AI applications.

Live Captioning
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Freemium5.0(1)
Speech-to-Text API

AssemblyAI

Industry-leading AI models to transcribe and understand speech with unmatched accuracy and scalability.

Conversation Intelligence
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Freemium
Speech-to-Text API

Vatis Tech

Accurate transcription that saves hours — built for EU accuracy standards.

Meeting Transcription
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Freemium
Speech-to-Text API

Deepgram

Enterprise-grade Voice AI APIs for real-time speech-to-text, text-to-speech, and conversational voice agents.

Audio Transcript Enrichment
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6 questions

Frequently asked questions

Which Speech-to-Text API tools have a free plan?

Five do: Speechmatics, AssemblyAI, Vatis Tech, Transcribe Video to Text, and Deepgram. Deepgram gives a one-time $200 credit before switching to pay-as-you-go billing. AssemblyAI has a free monthly tier and then charges from $0.15 per hour. Transcribe Video to Text is free with no sign-up required. Gladia is the only tool here with no free tier at all.

Which tool supports the most languages for transcription?

Transcribe Video to Text claims support for 100+ languages and Gladia also covers 100+ languages including rare ones. Speechmatics covers 55+ languages and dialects, including bilingual models. Deepgram supports over 36 languages. If broad language coverage is the deciding factor, Transcribe Video to Text and Gladia are the widest, though Gladia requires a sales call to get started.

Which Speech-to-Text API is cheapest to start with?

Transcribe Video to Text and AssemblyAI are the easiest to start without spending money. Transcribe Video to Text requires no sign-up and has a free tier, with Pro at $12 a month. AssemblyAI offers a free monthly plan, then $0.15 per hour. Vatis Tech's Basic plan is $10 a month. Deepgram gives a $200 one-time credit before any billing begins.

Which tools include speaker diarization?

Speaker diarization, which labels who said what in a recording, is available in Speechmatics, AssemblyAI, Vatis Tech, and Deepgram. AssemblyAI also adds speaker identification on top of diarization. Transcribe Video to Text offers speaker labels. Gladia does not list diarization among its features.

Which tool suits a large enterprise with high audio volume?

Speechmatics and Deepgram both have Enterprise plans, though both require contacting sales for pricing. Speechmatics Pro is capped at 6,000 hours per month, so very large projects need the Enterprise tier. Deepgram's Growth plan starts at $4,000 per year in pre-paid credits, which is the steepest published commitment here. AssemblyAI also has an Enterprise plan available via sales contact.

Can any of these tools transcribe meetings in real time?

Yes. Speechmatics, Vatis Tech, Transcribe Video to Text, and Gladia all support meeting transcription. Speechmatics and AssemblyAI both offer real-time streaming transcription. Gladia highlights low latency as a core feature for live use. Speechmatics and AssemblyAI are the two with published per-hour pricing for real-time work.