
AssemblyAI
AI audio API for transcription, speaker diarization, and audio intelligence.

Startup Program
AssemblyAI gives early-stage startups 12 months of recurring free credits for its speech-to-text and voice intelligence APIs, then startup pricing after the program. The credit amount is fixed but not published. The program is for pre-seed to Series A teams (bootstrapped teams are welcome) launching within 6 months. Applications are reviewed within a week, and Accel and YC companies get a decision within 48 hours.
About AssemblyAI
AssemblyAI: Industry-Leading Speech-to-Text and Audio Intelligence Platform
AssemblyAI is a developer-first AI platform offering industry-leading speech-to-text, speaker diarization, and advanced audio intelligence capabilities via a simple API. Built for accuracy, scalability, and ease of integration, AssemblyAI empowers developers and enterprises to transform voice data into actionable insights and innovative product experiences.
Key Features
State-of-the-Art Speech-to-Text: Achieve industry-leading transcription accuracy for alphanumerics, proper nouns, and technical language, with up to 30% fewer hallucinations than other providers.
Speaker Diarization: Automatically identify and label individual speakers in audio, even in complex multi-participant conversations.
Audio Intelligence: Go beyond transcription with features like entity detection, topic extraction, sentiment analysis, summarization, and content moderation.
Multilingual Support: Accurately transcribe and analyze speech in multiple languages, with automatic language detection.
Automatic Formatting: Outputs are formatted for clarity, including punctuation, capitalization, and correct handling of numbers and proper nouns.
Real-Time and Batch Processing: Supports both real-time streaming and asynchronous batch processing for flexible workflows.
Developer-Friendly API: Comprehensive documentation, SDKs, and a no-code playground make integration and testing easy for teams of any size.
Scalable and Reliable: Handles over 600 million inference calls per month and processes more than 3.5 million audio files daily.
Enterprise-Grade Security: Built with security and compliance in mind, suitable for sensitive and large-scale deployments.
Continuous Innovation: Weekly feature updates and ongoing research ensure access to the latest advancements in Speech AI.
Use Cases
Automated transcription for meetings, calls, podcasts, and video content
Conversation intelligence for sales, support, and compliance teams
Voice analytics and sentiment analysis for customer experience optimization
Content moderation and safety for user-generated audio
Real-time captioning and accessibility solutions
Multilingual transcription and translation for global audiences
Model Selection
Standard Speech-to-Text: High-accuracy transcription for general and specialized audio.
Audio Intelligence Models: Entity detection, summarization, sentiment analysis, and more.
Customizable Workflows: Combine features and tailor outputs to specific business needs.
Getting Started
Website: assemblyai.com
API Documentation: AssemblyAI Docs
No-Code Playground: Try the Playground
Product Overview: Learn More
Contact & Support: Contact AssemblyAI
AssemblyAI powers the next generation of voice-enabled products and services, delivering unmatched accuracy, advanced audio intelligence, and developer-friendly tools to turn voice data into business value.

Dylan Fox
Founder & CEO at AssemblyAI
Open roles at AssemblyAI
9 open roles- Enterprise Account ExecutiveSan FranciscoOn-siteFull-time12 days ago
- Finance EngineerUnited StatesOn-siteFull-time16 days ago
- Head of Sales, Digital NativeSan FranciscoOn-siteFull-time23 days ago
- Security Operations EngineerRemoteRemoteFull-time1 month ago
- Senior Research EngineerRemote - New YorkRemoteFull-time1 month ago
- Senior Software Engineer, InferenceUnited KingdomOn-siteFull-time1 month ago