AssemblyAI

313

5.0

(0 Reviews)

34.74%

AssemblyAI delivers industry-leading speech-to-text and voice understanding APIs that help developers build accurate, scalable Voice AI applications fast.

Verified by SeekToolUpdated: 2026.07.01

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#AI Speech Recognition #AI Transcriber #Speech To Text

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AssemblyAI Product Information

What is AssemblyAI?

AssemblyAI is a powerful Voice AI platform that turns spoken language into accurate text and meaningful insights—fast. Whether you're building voice agents, analyzing customer calls, or creating real-time transcription tools, AssemblyAI gives developers the models, APIs, and infrastructure to embed speech intelligence into any product.

Its latest breakthrough, Universal-3.5 Pro Realtime, is the first streaming speech-to-text model that uses the agent’s question as context to boost accuracy during live conversations. Trusted by companies like Zoom and Siro, AssemblyAI delivers industry-leading performance with no hidden limits, making it ideal for startups and enterprises alike.

What are the features of AssemblyAI?

Realtime Speech-to-Text API: Stream highly accurate transcriptions with ultra-low latency using models like Universal-3.5 Pro Realtime.
Pre-recorded Speech-to-Text API: Get polished transcripts in 99 languages with natural language prompting for custom outputs.
Voice Agent API: Build production-ready voice agents with built-in turn-taking, interruption handling, and seamless LLM integration.
Speech Understanding API: Go beyond words—extract speaker identification, sentiment, chapters, and summaries in one call.
Guardrails: Automatically redact PII and moderate sensitive content before it reaches your logs or AI models.
LLM Gateway: Route requests across top LLMs (GPT, Claude, Gemini) from a single endpoint with automatic fallbacks.
Self-Hosted & Cloud Deployments: Choose flexible infrastructure options to meet security, compliance, or scale needs.

What are the use cases of AssemblyAI?

Power AI scribes that auto-document doctor-patient conversations in healthcare settings.
Build agent assist tools that give live suggestions to customer support reps during calls.
Create voice agents for appointment booking, tech support, or sales demos.
Analyze thousands of support calls with conversation intelligence to spot trends and improve training.
Generate real-time captions for live events, webinars, or media broadcasts.
Automate medical transcription with HIPAA-compliant, high-accuracy models.
Repurpose podcast or meeting audio into blog posts, social clips, or summaries using AI.

How to use AssemblyAI?

Sign up for a free AssemblyAI account to get your API key.
Install the Python SDK: pip install assemblyai.
Choose the right API—use the Realtime API for live audio streams or Pre-recorded API for uploaded files.
For real-time transcription, set speech_model="u3-rt-pro" to use the new Universal-3.5 Pro Realtime model.
Enable features like PII redaction or sentiment analysis by adding parameters to your API request.
Test models instantly in the no-code Playground before coding your integration.

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AssemblyAI Related Other Categories

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AssemblyAI Traffic Analysis

💡 Insights

⭐

Medium Scale

100K-1M monthly visits. Growing tool with active development.

⚠️

Slight Decline

Traffic has slightly decreased recently.

💎

High Stickiness

Low bounce rate (37%) and deep engagement (4.0 pages/visit). Excellent user experience.

🎯

Strong Brand

64% direct traffic. High user loyalty.

Monthly Visits
520.35K
Bounce Rate
36.77%
Pages Per Visit
4.04
Visit Duration
00:03:12
Global Rank
87404
Country Rank
24023

Visits Over Time

Traffic Sources

Direct63.69%

Search Organic17.95%

Referrals5.59%

Social Organic4.65%

Search Paid2.75%

Gen Ai2.65%

Display Ads1.18%

Mail0.99%

Social Paid0.54%

Affiliate0.01%

Top Keywords

assemblyai

CPC$5.06

42.01KTraffic

assembly ai

CPC$4.73

38.25KTraffic

assembly

CPC$1.60

5.86KTraffic

assemblyai playground

CPC$0.45

4.83KTraffic

deepgram

CPC$5.07

4.05KTraffic

Top Regions

RegionPercentage

Brazil

34.74%

India

9.27%

United States

7.99%

Italy

5.55%

South Africa

5.25%

Low

High

AssemblyAI FAQ

What makes Universal-3.5 Pro Realtime different from other speech models?

It’s the first streaming model that uses the agent’s question as context to better understand and transcribe the user’s response in real time—boosting accuracy, especially in Q&A scenarios.

Does AssemblyAI support multiple languages?

Yes! The Pre-recorded Speech-to-Text API supports 99 languages, and many models handle multilingual conversations seamlessly.

Can I redact sensitive information like credit card numbers or SSNs?

Absolutely. Use the Guardrails feature to automatically detect and redact PII, PHI, and other sensitive data from both audio and transcripts.

Is there a free tier for testing?

Yes—AssemblyAI offers a free plan so you can try the APIs and Playground before committing.

How does the Voice Agent API handle interruptions?

It includes built-in turn detection and interruption handling, so your voice agent responds naturally when users speak over it—no extra engineering needed.

Can I switch between LLMs without changing my code?

Yes! The LLM Gateway lets you route requests through GPT, Claude, Gemini, or community models from one endpoint, with automatic fallbacks during outages.

What kind of accuracy improvements do customers see?

Users report 2x higher free-to-paid conversion, 80% higher customer satisfaction, and 75% less engineering time spent managing infrastructure.

AssemblyAI Reviews

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AssemblyAI Pricing

Free

Get started with $50 in free credits. For developers looking to prototype with Speech AI.

Access to Speech-to-Text and Audio Intelligence models
Speech recognition
Speaker diarization
Custom spelling and vocabulary
Profanity filtering, auto punctuation and casing
Compliance with EU Data Residency standards
Developer docs and community support

Pay as you go

For teams ready to integrate Speech AI into their products.

0.12/hr

Unlimited access to Speech-to-Text, Audio Intelligence, and LeMUR
Streaming Speech-to-Text
Concurrency starting at 200 files and 100 streams
Technical support via live chat and email
Cancel anytime

Custom

For teams building products at scale.

Custom

Flexible, zero-obligation pricing that scales to millions of hours
Dedicated technical support with response time under one hour
Customize rate limits - scale to any workload
Customized SLAs and SLOs
Early access to new models and model improvements
Self-hosted deployments (On-prem, VPC) (Coming soon!)

Speech-to-text

Build on top of the most accurate Speech-to-Text model on the market with >93% accuracy.

0.12/hr

Speaker Diarization
Automatic Language Detection
Profanity Filtering
Custom Vocabulary
Multichannel
Filler Word Filtering
Custom Spelling
Word Timestamps
Auto Punctuation and Casing
ITN/Formatting
Confidence Scores
Word Search
Export SRT/VTT Captions
Export Paragraphs/Sentences

Streaming Speech-to-text

Transcribe live audio and video files synchronously at low latency and high quality.

0.47/hr

Auto Punctuation and Casing
Custom Vocabulary
End of Utterance Detection
ITN/Formatting

Claude 3.5 Sonnet

Apply LLMs to voice data and explore a variety of LLM capabilities.

0.003/1K tokens (Input), 0.015/1K tokens (Output)

Claude 3 Opus

Apply LLMs to voice data and explore a variety of LLM capabilities.

0.015/1K tokens (Input), 0.075/1K tokens (Output)

Claude 3 Haiku

Apply LLMs to voice data and explore a variety of LLM capabilities.

0.00025/1K tokens (Input), 0.00125/1K tokens (Output)