VoiSpark is an AI voice generator for creators, offering 700+ voices, emotion tags, and voice cloning.
Free·from $9.9/mo
About AssemblyAI
What is AssemblyAI?
AssemblyAI provides AI models to transcribe and understand speech via powerful APIs. Developers use its Pre-recorded and Realtime Speech-to-Text APIs, along with Speech Understanding and Voice Agent APIs, to build voice AI into any product on any stack.
Who is it for?
AssemblyAI is designed for developers and engineering teams building AI scribes, notetakers, agent assist, call analytics, conversation intelligence, dictation, medical transcription, and voice agents. It is trusted by millions of developers and companies like Zoom and Siro.
What problem does it solve?
It eliminates the complexity of building accurate speech recognition from scratch. With its new Universal-3.5 Pro model, it handles real-world audio with high accuracy across 18 languages, including native code switching, formatting, filler words, and word-level timestamps — all delivered via easy APIs.
Use cases
Top voice AI companies use AssemblyAI for AI scribes, AI notetakers, agent assist, call analytics, conversation intelligence, dictation, medical transcription, and voice agents.
Key features
- Pre-recorded Speech-to-Text API — Most accurate async transcription with language detection, formatting, filler words, keyterms prompting, custom spelling, and word-level timestamps.
- Realtime Speech-to-Text API — Stream live audio for real-time transcription with low latency.
- Sync Speech-to-Text API — Synchronous transcription for quick, short audio clips.
- Speech Understanding API — Extract insights, sentiment, and topics from spoken content.
- Voice Agent API — Build voice-based agents with guardrails and LLM integration.
- Universal-3.5 Pro Model — New flagship speech-to-text model handling real-world audio with high accuracy across 18 languages.
- Self-Hosted & Cloud Deployments — Flexible deployment options including self-hosted voice AI cloud.
SaaSpartout Score
7.8
/10
Editorial score from our review methodology — not user ratings.
◆ AI advisor — 30 seconds, no signup
Why are you looking at Voice Agents tools today?
AssemblyAI Pricing
AssemblyAI pricing: Free to start, then pay-as-you-go. Billing model: Free.
For comparison: the median starting price in AI Voice is $10/month, measured across 54 tools we track. See the full SaaS Pricing Index →
Free Trial
Start free with no commitments. Get API credits to try Pre-recorded, Realtime, and other APIs.
Pay-as-you-go
After free trial, pay-as-you-go pricing for Pre-recorded Speech-to-Text API, Realtime Speech-to-Text API, Sync Speech-to-Text API, Voice Agent API, Speech Understanding, Guardrails, and LLM Gateway. Contact sales for custom pricing.
Custom Plans
Contact sales for volume discounts and enterprise needs.
Frequently asked questions
How much does AssemblyAI cost?
AssemblyAI offers a free trial to get started, then pay-as-you-go pricing. Specific rates depend on the API (e.g., Pre-recorded Speech-to-Text). Contact sales for custom plans.
Is AssemblyAI free?
Yes, AssemblyAI provides a free trial with API credits to test its services. After that, usage is billed per API call.
What is AssemblyAI used for?
Developers use AssemblyAI to build voice AI products: AI scribes, notetakers, agent assist, call analytics, conversation intelligence, dictation, medical transcription, and voice agents.
Who is AssemblyAI best for?
AssemblyAI is best for developers and teams building voice-enabled applications. It is trusted by Zoom, Siro, and millions of developers.
Does AssemblyAI support real-time transcription?
Yes, AssemblyAI offers a Realtime Speech-to-Text API for live audio transcription, plus a new Universal-3.5 Pro model optimized for real-time and pre-recorded audio.
What are alternatives to AssemblyAI?
Top alternatives include Google Cloud Speech-to-Text, AWS Transcribe, Azure Speech, and Deepgram. Each has different pricing and features.
