Voice + transcription API
Generate speech, design or clone voices, and transcribe audio with speaker labels from one pay-as-you-go credit balance. Start with $1.00 free credit, no card required.
Pay as you go with one balance across voice and transcription workflows.
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Use Standard for fast app narration and prototypes, or Pro voices when you need multilingual coverage and more expressive delivery.
Playable proof
Three approved demo clips show baseline narration, Pro dialogue, and a designed voice. Playback is manual, one clip at a time, with transcripts visible for review.
Warm Narrator
The lighthouse had stood on that cliff for a hundred years, watching ships pass through storms it could never calm. Tonight, the keeper climbed the spiral stairs one last time.
Casual Host + Chat Host
Host: So this clip uses two Pro voices in one dialogue? Co-host: Exactly. One script, separate speakers, and a conversational delivery for product demos. Host: That is exactly what I needed.
Commanding custom voice
Listen carefully. We have one shot at this. The window opens at midnight and closes at twelve-oh-three. No second chances.
Voice library proof
A compact set of approved voices with public preview paths, pulled from the same curated inventory behind the voice library.
narrator_warm_male
Deep, warm voice with a gentle storytelling tone
podcast_conversational_female
Conversational voice for podcast-style dialogue
edu_encouraging_female
Supportive teacher voice for learning content
narrator_epic_female
Dramatic narration voice for high-stakes scenes
meditation_serene_female
Soft, calm voice for guided listening flows
news_anchor_male
Authoritative, steady male news anchor
Capabilities
Generate speech, design or clone voices, transcribe recordings, and keep speaker labels under one credit balance.
Turn text into clean speech for app narration, onboarding flows, videos, and high-volume prototypes.
Use Pro voices for richer delivery, 23-language coverage, custom clones, and prompt-designed voices.
Add natural reactions to English Pro voice output with tags like [laugh], [sigh], [gasp], and [clear throat].
Describe the sound, accent, pace, and personality you want, then save the generated voice for future requests.
Upload reference audio once, unlock the voice, and reuse it across Pro generation workflows.
Send audio and receive transcript text with timestamps, confidence, and speaker labels.
Pricing clarity
Estimate Standard TTS, Pro TTS, transcription, and summaries from the same credit balance. Listed rates are the prices you pay from credits, with no subscription required.
Transcription
Send audio to POST /v1/audio/transcribe and get transcript text, timestamps, confidence, and speaker labels. Diarization is included by default at no extra charge.
Voice design
Describe a voice in plain English, generate it, and reuse it in Pro TTS. First design free, then $1.00 per design.
Open Voice StudioVoice cloning
Upload reference audio to create a custom clone, then unlock it for $3.00.
Browse voicesBuild with one balance
LeanVox is credit-based. Use the same balance for TTS, Pro voices, voice design, voice clones, and transcription.