Voices

Understanding voice selection and characteristics

Overview

NeoSpeech offers 50+ high-quality voices spanning 90+ languages, genders, and styles. Each voice is designed for specific use cases and delivers natural, human-like speech synthesis.

Voice Library

Our voice library includes:

• 50+ unique voices across global languages
• Multiple genders: Male, female, and neutral options
• 90+ languages & locales: English, Spanish, French, German, Japanese, Korean, and more
• Regional accents: US, UK, Australian, and more
• Various styles: Professional, conversational, energetic, calm

Voice Characteristics

Gender

Female Voices

Warm, approachable, and professional female voices

Male Voices

Confident, authoritative male voices

Neutral Voices

Gender-neutral voices for inclusive content

Locales

English

en-US - American English (most popular)

• Lyra, Kai, Zara, Marcus, Victoria

en-GB - British English

• Oliver, Emma, George, Charlotte

en-AU - Australian English

• Jack, Sophie

en-CA - Canadian English

• Liam, Olivia

European Languages

fr-FR - French (France)

• Amélie, Pierre, Marie

de-DE - German (Germany)

• Hans, Anna, Ludwig

es-ES - Spanish (Spain)

• Sofia, Carlos, Isabel

it-IT - Italian (Italy)

• Marco, Giulia

pt-PT - Portuguese (Portugal)

• João, Maria

Asian Languages

ja-JP - Japanese

• Yuki, Haruto, Sakura

ko-KR - Korean

• Min-jun, Ji-woo

zh-CN - Chinese (Simplified)

• Wei, Mei

hi-IN - Hindi

• Arjun, Priya

Other Languages

nl-NL - Dutch

• Lars, Emma

pl-PL - Polish

• Jakub, Zofia

ru-RU - Russian

• Dmitri, Anastasia

ar-SA - Arabic

• Ahmed, Fatima

Popular Voices

Professional & Business

Perfect for corporate content, presentations, and training:

Lyra (Female, en-US)

Characteristics: Warm, professional, clear, trustworthy

Best For:

• Business presentations
• Corporate training
• Professional narration
• Educational content

Sample: Provides a polished, confident tone ideal for executive communications

Marcus (Male, en-US)

Characteristics: Authoritative, confident, professional, clear

Best For:

• Business communications
• Leadership content
• Corporate videos
• Professional announcements

Sample: Deep, commanding voice perfect for executive presentations

Victoria (Female, en-GB)

Characteristics: Sophisticated, professional, refined, British

Best For:

• International business
• Luxury brands
• Professional services
• Academic content

Sample: Elegant British accent ideal for sophisticated audiences

Conversational & Friendly

Great for chatbots, virtual assistants, and casual content:

Kai (Male, en-US)

Characteristics: Energetic, friendly, confident, dynamic

Best For:

• Virtual assistants
• Gaming applications
• Youth-oriented content
• Interactive experiences

Sample: Upbeat and engaging for interactive applications

Zara (Female, en-US)

Characteristics: Approachable, warm, friendly, conversational

Best For:

• Chatbots
• Customer service
• Social content
• Casual communication

Sample: Natural, conversational tone perfect for AI assistants

Oliver (Male, en-GB)

Characteristics: Casual, friendly, British, relatable

Best For:

• Casual content
• Storytelling
• Podcasts
• Entertainment

Sample: Relaxed British voice ideal for informal content

Narration & Media

Ideal for audiobooks, podcasts, and long-form content:

Emma (Female, en-GB)

Characteristics: Clear, expressive, engaging, storyteller

Best For:

• Audiobooks
• Podcasts
• Documentaries
• Long-form narration

Sample: Excellent pacing and expression for storytelling

George (Male, en-GB)

Characteristics: Rich, deep, narrative, professional

Best For:

• Documentary narration
• Audiobook narration
• Video content
• Storytelling

Sample: Classic narrator voice with excellent depth

Choosing the Right Voice

By Use Case

Business & Corporate

Recommended: Lyra, Marcus, Victoria

Professional, authoritative voices for business communications

E-Learning & Education

Recommended: Lyra, Emma, Victoria

Clear, articulate voices for educational content

Chatbots & Assistants

Recommended: Kai, Zara, Oliver

Friendly, conversational voices for interactive applications

Audiobooks & Podcasts

Recommended: Emma, George, Oliver

Engaging, expressive voices for long-form content

IVR & Phone Systems

Recommended: Lyra, Marcus, Kai

Clear, professional voices for telecommunications

Gaming & Entertainment

Recommended: Kai, Zara, Oliver

Dynamic, energetic voices for interactive media

Marketing & Advertising

Recommended: Kai, Lyra, Marcus

Engaging, persuasive voices for promotional content

Accessibility

Recommended: Lyra, Marcus, Victoria

Clear, easy-to-understand voices for screen readers

By Audience

Professional Audience

Use authoritative, polished voices: Marcus, Lyra, Victoria

These voices convey credibility and professionalism

General Audience

Use friendly, approachable voices: Zara, Kai, Oliver

These voices are relatable and conversational

Youth Audience

Use energetic, dynamic voices: Kai, Zara

These voices are engaging and vibrant

International Audience

Match voice locale to audience language

Use native speakers for best pronunciation and authenticity

Voice Testing

Listen to Samples

Always listen to voice samples before production:

curl -s "https://api.neospeech.io/v1/voices/list" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
  | jq -r '.data.voices[] | "\(.name): \(.sample_url)"'

A/B Test Voices

Test multiple voices with your audience:

for voice in lyra zara marcus; do
  curl -X POST "https://api.neospeech.io/v1/audio/speech" \
    -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
    -H "Content-Type: application/json" \
    -d "{\
      \"input\": \"Your test message here\",\
      \"voice\": \"${voice}\",\
      \"model\": \"aurora-3.5\"\
    }" \
    --output "${voice}-test.mp3"
done

Test with Your Content

Generate samples using your actual content:

curl -X POST "https://api.neospeech.io/v1/audio/speech" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": "Welcome to our platform. This is a sample of how our content will sound. Please evaluate the voice quality and tone.",
    "voice": "lyra",
    "model": "aurora-3.5"
  }' \
  --output sample-review.mp3

Voice Customization

Pitch Adjustment

Adjust voice pitch to match your brand:

# Higher pitch (more energetic)
curl -X POST "https://api.neospeech.io/v1/audio/speech" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "voice": "lyra",
    "pitch": "+15%",
    "input": "Welcome to our service!"
  }' \
  --output lyra-high-pitch.mp3

# Lower pitch (more authoritative)
curl -X POST "https://api.neospeech.io/v1/audio/speech" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "voice": "marcus",
    "pitch": "-10%",
    "input": "This is an important announcement."
  }' \
  --output marcus-low-pitch.mp3

Style Control

Apply emotional styles to voices:

# Excited style for promotional content
curl -X POST "https://api.neospeech.io/v1/audio/speech" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "voice": "kai",
    "style": "excited",
    "styleDegree": "1.8",
    "input": "Check out our amazing new features!"
  }' \
  --output kai-excited.mp3

# Calm style for meditation content
curl -X POST "https://api.neospeech.io/v1/audio/speech" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "voice": "zara",
    "style": "calm",
    "styleDegree": "1.2",
    "input": "Take a deep breath and relax."
  }' \
  --output zara-calm.mp3

Best Practices

Match Content Type

Choose voices that match your content style and purpose

Consider Audience

Select voices that resonate with your target demographic

Test Before Production

Always test voices with sample content before committing

Stay Consistent

Use the same voice throughout a project for consistency

Locale Matching

Match voice locale to content language for best results

Get Feedback

Collect user feedback on voice selection

Voice Selection Checklist

Before finalizing your voice choice:

• Listened to voice samples
• Tested with actual content
• Considered target audience
• Matched voice to use case
• Tested different styles and pitch
• Collected stakeholder feedback
• Verified locale matches content
• Confirmed voice availability
• Tested across different devices
• Evaluated against brand guidelines

Finding Voices

List All Voices

curl -X GET "https://api.neospeech.io/v1/voices/list?limit=100" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY"

Filter by Gender

curl -X GET "https://api.neospeech.io/v1/voices/list?gender=female" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY"

Filter by Locale

curl -X GET "https://api.neospeech.io/v1/voices/list?locale=en-US" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY"

Search by Name

curl -X GET "https://api.neospeech.io/v1/voices/list?search=professional" \
  -H "Authorization: Bearer $NEOSPEECH_API_KEY"

Related Resources

List Voices API

Get complete voice list with details

Generate Speech

Create audio with selected voice

Models Guide

Choose the right audio model

Best Practices

Optimize voice usage