# AssemblyAI

> AI speech recognition and audio intelligence API for developers.

AssemblyAI is a speech AI platform offering industry-leading APIs for speech transcription, audio intelligence, and audio understanding. Its Universal-2 model delivers state-of-the-art accuracy with support for 99 languages, while its audio intelligence layer adds automatic chapters, sentiment analysis, entity detection, PII redaction, and content safety filtering. Developers building voice AI applications, conversation intelligence platforms, and meeting analytics tools choose AssemblyAI for its best-in-class accuracy, comprehensive audio AI features, and developer-friendly documentation that enables production deployment in hours.

## Quick facts

- Categories: Speech to Text, Developer Tools, Audio, Transcriber
- Pricing: Freemium (free plan + paid tiers)
- Free plan: Yes
- Official site: https://assemblyai.com
- Last checked: 2026-10-23

## Key features

- High-accuracy speech-to-text API
- Speaker diarization
- Content moderation
- Auto chapters and summaries
- Entity detection
- LeMUR for LLM audio tasks

## Use cases

- Transcribing audio content
- Building voice-enabled applications
- Moderating audio content
- Creating AI-powered audio analysis

## Links

- Nextool.ai page: https://nextool.ai/tools/assemblyai/
- Alternatives: https://nextool.ai/alternatives/assemblyai/

Source: Nextool.ai (https://nextool.ai/tools/assemblyai/). Pricing and features change; confirm on the provider's site before relying on them.