Speech AI

## $10 Free Credits Included Every subscriber receives **$10 in free Developer Portal credits** to try all APIs instantly. --- ## Complete Speech AI Suite - Four Tools, One API ### Pronunciation Assessment Score English pronunciation at phoneme, word, and sentence levels (0-100). Exceeds human expert inter-annotator agreement. 17MB model with sub-300ms inference. | Metric | Value | |--------|-------| | Phone-level accuracy | Exceeds human agreement by +3.5% | | Sentence-level accuracy | Exceeds human agreement by +3.6% | | Inference latency | p50 = 257ms, p95 = 423ms | | Model footprint | 17MB (edge / mobile / browser ready) | ### Speech-to-Text (STT) Convert spoken English to text with word-level timestamps and per-word confidence scores. CTC decoding with Viterbi forced alignment for precise timing. ### Text-to-Speech (TTS) Generate natural speech from text with 50+ voices across 29 languages. Speed control from 0.5x to 2.0x. 24kHz WAV output. ### Whisper STT Pro Production-grade speech recognition powered by Whisper Large V3 Turbo (809M parameters). Supports 99 languages with word-level timestamps. Optional speaker diarization identifies who said what. GPU-accelerated with sub-second latency. --- ### Pay As You Go Pricing | Service | Unit | Price per Unit | |---------|------|---------------| | Pronunciation Assessment | Per request | $0.02 | | Speech-to-Text | Per request | $0.01 | | Text-to-Speech | Per 1K characters | $0.02 | | Whisper Transcription | Per minute | $0.02 | ### API Endpoints | Service | Method | Endpoint | |---------|--------|----------| | Pronunciation | POST | /v1/speech/assess/base64 | | STT | POST | /v1/speech/transcribe/base64 | | TTS | POST | /v1/speech/synthesize | | TTS | GET | /v1/speech/voices | | Whisper | POST | /v1/speech/whisper/transcribe/base64 | *Built by Brainiall. Speech AI APIs with metered billing.*