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Voices

Aero TTS includes 90+ built-in voices across 20+ languages. Each voice is optimized for conversational speech with natural prosody and emotion.

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English (US) Voices

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Female

Voice IDNameDescription
aero-vayuVayuWarm, professional — most popular voice
aero-iraIraElegant, composed
aero-zaraZaraConfident, articulate
aero-ariaAriaFriendly, approachable
aero-priyaPriyaBright, energetic
aero-novaNovaModern, versatile
aero-lunaLunaCalm, soothing
aero-koreKoreClear, precise
aero-riverRiverNatural, flowing
aero-alloyAlloyStrong, distinct
aero-aoedeAoedeMelodic, expressive

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Male

Voice IDNameDescription
aero-kianKianDeep, authoritative
aero-atlasAtlasSmooth, confident
aero-echoEchoWarm, conversational
aero-ericEricClear, professional
aero-fenrirFenrirBold, commanding
aero-liamLiamFriendly, approachable
aero-onyxOnyxRich, resonant
aero-puckPuckLight, energetic

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English (UK) Voices

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Female

Voice IDNameDescription
aero-emmaEmmaClassic British, professional
aero-lilyLilyWarm, welcoming
aero-aliceAliceClear, precise
aero-isabellaIsabellaRefined, elegant

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Male

Voice IDNameDescription
aero-georgeGeorgeDistinguished, authoritative
aero-lewisLewisModern British, conversational
aero-danielDanielWarm, reliable
aero-fableFableStorytelling, expressive

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Hindi Voices

Voice IDNameGenderDescription
aero-ananyaAnanyaFemaleClear, professional Hindi
aero-kavyaKavyaFemaleWarm, conversational Hindi
aero-devDevMaleStrong, authoritative Hindi
aero-arjunArjunMaleFriendly, approachable Hindi
aero-rohanRohanMaleConversational Hindi — built for BPO and call-center agents

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Multilingual Voices (Aero-Mini / Aero-Nano)

The aero-mini and aero-nano models support additional languages including Spanish, French, German, Italian, Chinese, Japanese, Korean, and Portuguese. Use the voices endpoint to discover all available voices: 
curl https://api.thinnest.ai/api/tts/voices?language=es \
  -H "Authorization: Bearer YOUR_API_KEY"

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Choosing the Right Voice

Use CaseRecommended VoiceWhy
Customer supportaero-vayu (F) or aero-kian (M)Warm, professional, builds trust
Sales callsaero-atlas (M) or aero-zara (F)Confident, persuasive
Appointment remindersaero-aria (F) or aero-liam (M)Friendly, clear
IVR / phone menusaero-eric (M) or aero-kore (F)Precise, easy to understand
Indian market (Hindi)aero-ananya (F) or aero-dev (M)Native Hindi speakers
BPO / Indian call centeraero-rohan (M)Tuned for conversational Hindi customer-support flows
British Englishaero-emma (F) or aero-george (M)Authentic British accent
Storytelling / narrationaero-fable (M) or aero-aoede (F)Expressive, engaging

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Preview Voices

You can preview any voice in the Aero TTS Playground in your dashboard, or via the API: 
curl -X POST https://api.thinnest.ai/api/tts/synthesize \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Hello! This is a preview of the Aero Vayu voice.",
    "voice": "aero-vayu",
    "model": "aero",
    "format": "mp3"
  }' \
  --output preview.mp3

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Voice Parameters

Fine-tune voice output with these parameters:
ParameterRangeDefaultDescription
speed0.5 - 2.01.0Playback speed multiplier
formatmp3, wav, pcm, opus, ogg, flac, aacmp3Output audio format
sample_rate8000 - 4800022050Audio sample rate in Hz
curl -X POST https://api.thinnest.ai/api/tts/synthesize \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Speaking a bit faster now.",
    "voice": "aero-vayu",
    "model": "aero",
    "speed": 1.3,
    "format": "wav",
    "sample_rate": 44100
  }' \
  --output fast.wav