AssemblyAI
FreemiumAssemblyAI sells speech models through an API rather than a consumer app. Developers send a file or live stream and get transcripts with timestamps, speaker labels, formatting and confidence scores; other endpoints summarize calls, detect topics and sentiment, or redact personal data. Its Universal speech models cover 99 languages, and a newer text-to-speech model targets voice agents. Billing runs per hour of audio processed, starting at roughly $0.15 per hour for pre-recorded transcription. The free tier covers about 185 hours of pre-recorded audio and 333 hours of streaming before charges begin.
Key features
- Pre-recorded and real-time speech-to-text APIs
- Speaker diarization, timestamps and smart formatting
- Speech understanding for summaries, topics and sentiment
- PII redaction and content moderation guardrails
- Text-to-speech model aimed at voice agents
- 99 languages, with 185 free hours of pre-recorded transcription
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