Inworld TTS

[briankwest]

Inworld TTS

Overview

Inworld is a text-to-speech engine available in SignalWire's AI Agent. It provides high-quality, expressive voices across multiple languages with streaming audio delivery.

Configuration

Set the TTS engine to inworld and specify a voice using the engine.voice:model format.

Parameters

Parameter	Type	Default	Description
voice	string	(required)	Voice selection in inworld.{voiceId}:{model} format

Models

Model ID	Description
inworld-tts-1.5-mini	Faster, lower-cost model
inworld-tts-1.5-max	Higher quality model

Voice Format

inworld.{voiceId}:{model}

Examples:

inworld.Lauren:inworld-tts-1.5-mini
inworld.Brian:inworld-tts-1.5-max
inworld.Asuka:inworld-tts-1.5-mini

Voices

English

Voice	Description
Abby	Bright, eager American female child voice, ideal for animated characters and upbeat educational content
Alex	Energetic and expressive mid-range male voice, with a mildly nasal quality
Amina	Warm, inviting West African female voice, ideal for community outreach and cultural storytelling
Anjali	Confident and articulate Indian female voice, ideal for professional training materials
Arjun	Clear, composed Indian male voice, well-suited for instructional webinars and technology explainers
Ashley	A warm, natural female voice
Avery	Youthful, performative male voice, suited for gameshow-style hosting and energetic presenter reads
Bianca	Deep, controlled female voice, ideal for serious corporate reads and composed documentary segments
Blake	Rich, intimate male voice, perfect for audiobooks, romantic content, and reassuring narration
Brandon	Bold, strident male voice, ideal for structured announcements and news-style reads
Brian	Friendly, encouraging American male voice, ideal for educational tutorials and motivational content
Callum	Casual and friendly Australian male voice, ideal for informal instructional content
Carter	Energetic, mature radio announcer-style male voice, great for storytelling and voiceovers
Cedric	Crisp, measured male voice, ideal for formal announcements and premium trailer narration
Celeste	Soft, whispery female voice, ideal for ASMR videos, soothing lullabies, and gentle mindfulness sessions
Chloe	Thoughtful, introspective youthful female voice, perfect for coming-of-age narratives
Claire	Warm, gentle Eastern European female voice, ideal for bedtime stories and relaxation podcasts
Clive	British-accented male voice with a calm, cordial quality
Conrad	Gruff, weathered male voice, perfect for detective archetypes and hard-edged audiobook roles
Craig	Older British male with a refined and articulate voice
Damon	Calm, raspy male voice, suited for moody narration and atmospheric roleplay characters
Darlene	Soothing, comforting Southern female voice, ideal for bedtime stories and family-centered commercials
Deborah	Warm, peaceful female voice with a calm tone
Dennis	Middle-aged man with a smooth, calm and friendly voice
Derek	Steady, professional, composed American male voice, ideal for banking support and service calls
Dominus	Robotic, deep male voice with a menacing quality — perfect for villains
Edward	American male with an emphatic, confident and streetwise tone
Elizabeth	Professional middle-aged woman, perfect for narrations and voiceovers
Elliot	Calm, steady male voice, suitable for nature documentaries and relaxed narrations
Ethan	Assured, precise male voice, perfect for tech tutorials and product demonstrations
Evan	Friendly, approachable, easygoing male voice, ideal for onboarding calls and retail assistance
Evelyn	Gentle and intimate female voice, ideal for personal ASMR content and affirmations
Gareth	Soothing, gentle male voice, ideal for guided meditations and relaxation-focused wellness content
Graham	Profound, authoritative British male voice, perfect for historical documentaries and luxury brand ads
Grant	Calm, attentive, helpful male voice, ideal for insurance claims and helpdesk interactions
Hades	Commanding and gruff male voice — think omniscient narrator or castle guard
Hamish	Friendly and casual Australian male voice, ideal for character-driven roles and upbeat fitness
Hana	Bright, expressive young female voice, perfect for storytelling, gaming, and playful content
Hank	Warm, laid-back Southern male voice, ideal for travel documentaries and heritage storytelling
Jake	Amiable, introspective male voice, ideal for motivational talks and personal growth content
James	Vibrant, expressive male voice, perfect for animated video content and captivating children's stories
Jason	Lucid, engrossing male voice, ideal for tech tips and creative productivity hacks
Jessica	Encouraging, articulate American female voice, perfect for self-help audiobooks and e-learning
Jonah	Soothing, calm male voice, great for tutorial guidance and reassuring support flows
Julia	Quirky, high-pitched female voice that delivers lines with playful energy
Kayla	Enthusiastic, youthful female voice, ideal for reaction videos and trendy product reviews
Kelsey	Warm, empathetic, reassuring female voice, ideal for phone support and appointment confirmations
Lauren	Confident, friendly American female voice, ideal for corporate presentations and engaging podcasts
Levi	Measured, ominous male voice, ideal for suspense narration and dark fantasy storytelling
Liam	Upbeat, motivating Australian male voice, perfect for energizing workout sessions and event promotions
Loretta	Inviting, folksy Southern female voice, perfect for cooking shows and heartwarming family tales
Lucian	Brooding, foreboding male voice, suited for villainous character arcs and gothic drama scenes
Luna	Calm, relaxing female voice, perfect for meditations, sleep stories, and mindfulness exercises
Malcolm	Authoritative, manipulative male voice, perfect for cunning leaders and intense negotiation scenes
Marcus	Authoritative, empathetic male voice, great for civic campaigns and trustworthy commercial reads
Mark	Energetic, expressive man with a rapid-fire delivery
Marlene	Friendly, relaxed Southern female voice, ideal for home-style cooking tutorials and community events
Mia	Youthful, expressive female voice, ideal for adolescent characters and school-age animation dialogue
Miranda	Menacing, cold-hearted female voice, perfect for strategic villains and mysterious narratives
Mortimer	Gravelly, aggressive male character voice, ideal for fantasy villains and high-intensity game dialogue
Nadia	Personable, lively female voice, perfect for tutorial walkthroughs and friendly support messaging
Naomi	Warm, grounded female voice, perfect for narrative podcasting and emotionally real brand storytelling
Nate	Conversational, sociable male voice, great for customer support and friendly guidance
Oliver	Neutral and clear male voice, ideal for public announcements and educational information
Olivia	Young, British female with a friendly and helpful tone, conveying confidence and efficiency
Pippa	Friendly and casual Australian female voice, ideal for relaxed instructional content
Pixie	High-pitched, childlike female voice with a squeaky quality — great for cartoon characters
Priya	Even-toned female voice with an Indian accent
Riley	Playful, youthful female voice, perfect for animated storytelling and high-energy kid-focused content
Ronald	Confident, British man with a deep, gravelly voice
Rupert	Resonant, commanding British male voice, ideal for motivational speeches and epic film trailers
Saanvi	Crisp, articulate Indian female voice, ideal for dynamic e-learning and vibrant travel vlogs
Sarah	Fast-talking young adult woman, with a questioning and curious tone
Sebastian	Intimidating, steely male voice, perfect for ruthless antagonists and strategic power struggles
Selene	Soft, flirtatious female voice, ideal for companion-style interactions and charming game dialogue
Serena	Soft, nurturing female voice, perfect for mindfulness sessions and gentle wellness podcasts
Shaun	Friendly, dynamic male voice great for conversations
Simon	Articulate, insightful male voice, perfect for corporate presentations and technical tutorials
Snik	Hoarse, cunning male voice, perfect for devious goblin roles and trickster-themed animations
Tessa	Upbeat, conversational Australian female voice, perfect for lifestyle vlogs and playful advertisements
Theodore	Gravelly male voice, with a time-worn quality
Timothy	Lively, upbeat American male voice
Trevor	Punchy, expressive male voice, perfect for energetic promos and fast-moving scripted event intros
Tristan	Deliberate, controlled male voice, ideal for documentary narration and polished voiceover campaigns
Tyler	Authoritative, insightful male voice, ideal for tech explainer videos and in-depth software reviews
Veronica	Intimidating, commanding female voice, perfect for ruthless antagonists and chilling monologues
Victor	Ominous, sinister male voice, ideal for dark conspiracies and enigmatic villain roles
Victoria	Silky, cunning British female voice, ideal for narrating intricate plots
Vinny	Gritty, assertive New York male voice, perfect for crime dramas and urban documentaries
Wendy	Posh, middle-aged British female voice

Arabic (ar)

Voice	Description
Nour	Polished female voice with a friendly tone, great for voiceover or support
Omar	Bright, confident male voice, great for announcements, broadcasts, and voiceovers

Chinese — Mandarin (zh)

Voice	Description
Jing	Energetic, fast-paced young female
Xiaoyin	Youthful female voice with a gentle, sweet quality
Xinyi	Female with a neutral tone, perfect for narrations
Yichen	Calm, flat young adult male voice

Dutch (nl)

Voice	Description
Erik	Older male voice with a weathered edge
Katrien	Female with an expressive voice
Lennart	Confident male voice, calm and relaxed
Lore	Clear, calm female voice, great for narrations and professional use cases

French (fr)

Voice	Description
Alain	Deep, smooth middle-aged male voice, composed and calm
Étienne	Calm young adult male
Hélène	Middle-aged female, with a smooth, musical, and graceful voice
Mathieu	Male voice carrying a nasal quality

German (de)

Voice	Description
Johanna	Calm older female with a low, smoky voice
Josef	Articulate male voice with an announcer-like quality

Hebrew (he)

Voice	Description
Oren	Steady male voice, great for podcasts, voiceovers, or announcers
Yael	Mid-range female voice, suitable for narrations and storytelling

Hindi (hi)

Voice	Description
Manoj	Clear, professional male voice, great for narrations, news anchors, and customer service
Riya	Professional and clean female voice, clear and articulate with a polished, approachable quality

Italian (it)

Voice	Description
Gianni	Deep, smooth male voice that speaks rapidly
Orietta	Calm adult female voice, with a soothing cadence

Japanese (ja)

Voice	Description
Asuka	Friendly, young adult female voice
Satoshi	Dramatic, expressive male voice filled with energy

Korean (ko)

Voice	Description
Hyunwoo	Young adult male voice
Minji	Energetic, friendly young female voice
Seojun	Clear, deep mature male voice
Yoona	Female with a gentle, soothing voice

Polish (pl)

Voice	Description
Szymon	Adult male voice with a warm, friendly quality
Wojciech	Middle-aged male voice

Portuguese (pt)

Voice	Description
Heitor	Composed male voice with a neutral tone
Maitê	Middle-aged female voice

Russian (ru)

Voice	Description
Dmitry	Deep, gravelly male voice, delivered at a moderate pace with a commanding and narrative tone
Elena	Clear, mid-range female voice, with a smooth texture and a neutral, informational tone
Nikolai	Deep, resonant male voice, delivered at a measured pace with a clear, theatrical quality
Svetlana	Soft, high-pitched female voice, with a moderate pace and slightly breathy quality

Spanish (es)

Voice	Description
Diego	Male voice with a soothing, gentle quality
Lupita	Vibrant, energetic young female voice
Miguel	Calm adult male voice, perfect for storytelling
Rafael	Middle-aged male with a deep, composed voice, great for narrations

[Len-PGH]

Brian wanted me to sample and give my opinion on which of these were good. This is my summary:

Voice Testing Results

Total: 90 English voices tested

By Rating

⭐⭐ Really Good — 4 voices

Nate, Oliver, Reed, Tyler

✅ Good — 62 voices

Alex, Ashley, Craig, Deborah, Dennis, Edward, Elizabeth, Mark, Olivia, Priya, Ronald, Sarah, Shaun, Theodore, Timothy, Wendy, Clive, Carter, Amina, Anjali, Arjun, Brandon, Brian, Callum, Cedric, Damon, Derek, Duncan, Elliot, Ethan, Evan, Felix, Gareth, Graham, Grant, Hank, Jake, James, Jason, Jessica, Jonah, Kayla, Kelsey, Lauren, Levi, Liam, Loretta, Lucian, Marcus, Marlene, Miranda, Nadia, Naomi, Pippa, Rupert, Saanvi, Selene, Serena, Simon, Sophie, Tessa, Trevor, Tristan, Victoria, Vinny

⚠️ Somewhat Intense — 2 voices

Veronica, Victor

🔶 Questionable — 6 voices

Avery, Bianca, Chloe, Claire, Malcolm, Mia, Mortimer

🔴 Too Intense — 1 voice

Sebastian

❌ Bad — 10 voices

Hades, Julia, Pixie, Dominus, Hana, Blake, Luna, Abby, Celeste, Evelyn, Hamish, Riley, Snik

🔧 Not Working — 3 voices

Conrad, Darlene, Eleanor

---

Summary

Status	Count	Voices
✅ Usable for production (Really Good + Good)	66
⚠️ Usable with caveats (Somewhat Intense)	2	Veronica, Victor
🔶 Needs further evaluation (Questionable)	7	Avery, Bianca, Chloe, Claire, Malcolm, Mia, Mortimer
🔴 Too intense for general use	1	Sebastian
❌ Not suitable (Bad)	13	Hades, Julia, Pixie, Dominus, Hana, Blake, Luna, Abby, Celeste, Evelyn, Hamish, Riley, Snik
🔧 Broken / not working	3	Conrad, Darlene, Eleanor

Complete English voice list:

Voice	Description	Rating
Alex	Energetic and expressive mid-range male voice, with a mildly nasal quality	Good
Ashley	A warm, natural female voice	Good
Craig	Older British male with a refined and articulate voice	Good
Deborah	Gentle and elegant female voice	Good
Dennis	Middle-aged man with a smooth, calm and friendly voice	Good
Edward	Male with a fast-talking, emphatic and streetwise tone	Good
Elizabeth	Professional middle-aged woman, perfect for narrations and voiceovers	Good
Hades	Commanding and gruff male voice, think an omniscient narrator or castle guard	Bad
Julia	Quirky, high-pitched female voice that delivers lines with playful energy	Bad
Pixie	High-pitched, childlike female voice with a squeaky quality - great for a cartoon character	Bad
Mark	Energetic, expressive man with a rapid-fire delivery	Good
Olivia	Young, British female with an upbeat, friendly tone	Good
Priya	Even-toned female voice with an Indian accent	Good
Ronald	Confident, British man with a deep, gravelly voice	Good
Sarah	Fast-talking young adult woman, with a questioning and curious tone	Good
Shaun	Friendly, dynamic male voice great for conversations	Good
Theodore	Gravelly male voice, with a time-worn quality	Good
Timothy	Lively, upbeat American male voice	Good
Wendy	Posh, middle-aged British female voice	Good
Dominus	Robotic, deep male voice with a menacing quality. Perfect for villains	Bad
Hana	Bright, expressive young female voice, perfect for storytelling, gaming, and playful content	Bad
Clive	British-accented English-language male voice with a calm, cordial quality	Good
Carter	Energetic, mature radio announcer-style male voice, great for storytelling, pep talks, and voiceovers	Good
Blake	Rich, intimate male voice, perfect for audiobooks, romantic content, and reassuring narration	Bad
Luna	Calm, relaxing female voice, perfect for meditations, sleep stories, and mindfulness exercises	Bad
Abby	Bright, eager American female child voice, ideal for animated characters, upbeat educational content, and lively kids' commercials	Bad
Amina	Warm, inviting West African female voice, ideal for community outreach, cultural storytelling, and educational workshops	Good
Anjali	A confident and articulate Indian female voice, ideal for professional training materials	Good
Arjun	Clear, composed Indian male voice, well-suited for instructional webinars and technology explainers	Good
Avery	Youthful, performative male voice, suited for gameshow-style hosting, energetic presenter reads, and expressive young character parts	Questionable
Bianca	Deep, controlled female voice, ideal for serious corporate reads, composed documentary segments, and measured authority-led explainers	Questionable
Brandon	Bold, strident male voice, ideal for structured announcements, news-style reads, and direct promotional messaging	Good
Brian	Friendly, encouraging American male voice, ideal for educational tutorials, motivational content, and instructional videos	Good
Callum	Casual and friendly Australian male voice, ideal for informal instructional content	Good
Cedric	Crisp, measured male voice, ideal for formal announcements, premium trailer narration, and command-forward presentation scripts	Good
Celeste	Soft, whispery female voice, ideal for ASMR videos, soothing lullabies, and gentle mindfulness sessions	Bad
Chloe	Thoughtful, introspective youthful female voice, perfect for coming-of-age narratives, personal growth stories, and emotional teen dramas	Questionable
Claire	Warm, gentle Eastern European female voice, ideal for bedtime stories and relaxation podcasts	Questionable
Conrad	Gruff, weathered male voice, perfect for detective archetypes, hard-edged audiobook roles, and serious investigative narration	Not Working
Damon	Calm, raspy male voice, suited for moody narration, atmospheric roleplay characters, and grounded meditative reads with subtle tension	Good
Darlene	Soothing, comforting Southern female voice, ideal for bedtime stories, family-centered commercials, and nostalgic narrations	Not Working
Derek	Steady, professional, composed American male voice, ideal for banking support, account inquiries, and service escalation calls	Good
Duncan	Warm, articulate British male voice for customer support and education	Good
Eleanor	Polished, approachable British female voice for support and learning	Not Working
Elliot	A calm, steady male voice, suitable for nature documentaries, general informational content, and relaxed narrations	Good
Ethan	Assured, precise male voice, perfect for tech tutorials, detailed gadget overviews, and captivating product demonstrations	Good
Evan	Friendly, approachable, easygoing male voice, ideal for onboarding calls, retail assistance, and customer check-ins	Good
Evelyn	A gentle and intimate female voice, ideal for personal ASMR content, affirmations, and close, calming conversations	Bad
Felix	Calm, friendly British male voice, ideal for help and tutorials	Good
Gareth	Soothing, gentle male voice, ideal for guided meditations, mindfulness exercises, and relaxation-focused wellness content	Good
Graham	Profound, authoritative British male voice, perfect for historical documentaries, luxury brand advertisements, and educational content	Good
Grant	Calm, attentive, helpful male voice, ideal for insurance claims, troubleshooting walkthroughs, and helpdesk interactions	Good
Hamish	Friendly and casual Australian male voice, ideal for character-driven roles and upbeat fitness	Bad
Hank	Warm, laid-back Southern male voice, ideal for travel documentaries, heritage storytelling, and down-to-earth podcast ads	Good
Jake	Amiable, introspective male voice, ideal for motivational talks, personal growth content, and charming interviews	Good
James	Vibrant, expressive male voice, perfect for animated video content, lively event hosting, and captivating children's stories	Good
Jason	Lucid, engrossing male voice, ideal for tech tips, creative productivity hacks, and supportive user interface tutorials	Good
Jessica	Encouraging, articulate American female voice, perfect for self-help audiobooks, warm customer service messages, and clear e-learning modules	Good
Jonah	Soothing, calm male voice, great for tutorial guidance, reassuring support flows, and gentle instructional narration with steady pacing	Good
Kayla	Enthusiastic, youthful female voice, ideal for reaction videos, trendy product reviews, and energetic lifestyle vlogs	Good
Kelsey	Warm, empathetic, reassuring female voice, ideal for phone support, appointment confirmations, and customer success calls	Good
Lauren	Confident, friendly American female voice, ideal for corporate presentations, upbeat commercials, and engaging podcasts	Good
Levi	Measured, ominous male voice, ideal for suspense narration, dark fantasy storytelling, and composed dramatic monologues	Good
Liam	Upbeat, motivating Australian male voice, perfect for energizing workout sessions, lively event promotions, and informal lifestyle content	Good
Loretta	Inviting, folksy Southern female voice, perfect for cooking shows, heartwarming family tales, and cozy radio ads	Good
Lucian	Brooding, foreboding male voice, suited for villainous character arcs, gothic drama scenes, and dark narrative worldbuilding	Good
Malcolm	Authoritative, manipulative male voice, perfect for cunning leaders, intense negotiation scenes, and persuasive villain speeches	Questionable
Marcus	Authoritative, empathetic male voice, great for civic campaigns, community outreach explainers, and trustworthy commercial reads	Good
Marlene	Friendly, relaxed Southern female voice, ideal for home-style cooking tutorials, community event promotions, and downhome commercials	Good
Mia	Youthful, expressive female voice, ideal for adolescent characters, school-age animation dialogue, and bright coming-of-age narrative scenes	Questionable
Miranda	Menacing, cold-hearted female voice, perfect for strategic villains, mysterious narratives	Good
Mortimer	Gravelly, aggressive male character voice, ideal for fantasy villains and high-intensity game dialogue	Questionable
Nadia	Personable, lively female voice, perfect for tutorial walkthroughs, friendly support messaging, and engaging narration	Good
Naomi	Warm, grounded female voice, perfect for narrative podcasting, people-first customer guidance, and emotionally real brand storytelling	Good
Nate	Conversational, sociable male voice, great for customer support and friendly guidance	Really Good
Oliver	Neutral and clear male voice, ideal for public announcements and educational information	Really Good
Pippa	Friendly and casual Australian female voice, ideal for relaxed instructional content	Good
Reed	Clear, professional American male voice, well-suited for support and training	Really Good
Riley	Playful, youthful female voice, perfect for animated storytelling, upbeat game characters, and high-energy kid-focused digital content	Bad
Rupert	Resonant, commanding British male voice, ideal for motivational speeches, epic film trailers, and dynamic corporate presentations	Good
Saanvi	Crisp, articulate Indian female voice, ideal for dynamic e-learning modules, articulate documentary narrations, and vibrant travel vlogs	Good
Sebastian	Intimidating, steely male voice, perfect for ruthless antagonists, strategic power struggles, and chilling monologues	Too Intense
Selene	Soft, flirtatious female voice, ideal for companion-style interactions, charming game dialogue, and emotionally playful character-driven story scenes	Good
Serena	Soft, nurturing female voice, perfect for mindfulness sessions, nature-inspired visualizations, and gentle wellness podcasts	Good
Simon	Articulate, insightful male voice, perfect for corporate presentations, technical tutorials, and steady news reporting	Good
Snik	Hoarse, cunning male voice, perfect for devious goblin roles, fantasy heist scenarios, and trickster-themed animations	Bad
Sophie	Friendly British female voice, great for assistance and knowledge sharing	Good
Tessa	Upbeat, conversational Australian female voice, perfect for lifestyle vlogs, playful advertisements, and engaging social media content	Good
Trevor	Punchy, expressive male voice, perfect for energetic promos, announcer-driven reveals, and fast-moving scripted event intros	Good
Tristan	Deliberate, controlled male voice, ideal for documentary narration, polished voiceover campaigns, and clear long-form infomercial storytelling	Good
Tyler	Authoritative, insightful male voice, ideal for tech explainer videos, in-depth software reviews, and dynamic coding guides	Really Good
Veronica	Intimidating, commanding female voice, perfect for ruthless antagonists, high-stakes negotiations, and chilling monologues	Somewhat Intense
Victor	Ominous, sinister male voice, ideal for dark conspiracies, eerie suspense scenes, and enigmatic villain roles	Somewhat Intense
Victoria	Silky, cunning British female voice, ideal for narrating intricate plots	Good
Vinny	Gritty, assertive New York male voice, perfect for crime dramas, urban documentaries, and no-nonsense character roles	Good