#1 realtime voice quality
Built around listening tests and real user perception, not only internal benchmarks.
Inworld realtime AI for consumer-facing applications
Inworld is a research lab and inference provider for realtime AI at consumer scale. First-party TTS and STT models, the LLMs you choose, and the inference underneath.
Status reached 1M users in 19 days.made daily practice feel more personal.helped every interaction feel more human.kept every handoff moving in real time.gave characters a voice that stays in the moment.
OtherHalf powers voice-first companions at scale.
Ongoing, personal, emotionally engaging AI interaction. Relationship-building, emotional connection, and entertainment at scale.
Responsive guidance, natural practice, and immediate feedback help learners stay engaged from the first exchange.
Calm, context-aware conversations help people feel heard while teams keep a consistent experience at scale.
Voice agents can listen, reason, call tools, and move work forward without breaking the conversation.
Characters react with timing, tone, and memory that make every scene feel alive.
One realtime foundation for products that need interaction to feel immediate.We make realtime AI efficient enough for consumer scale.
Every layer, against the alternative
Less overhead at every step means more room for the experience your users actually notice.
Realtime voice
More throughput with less infrastructure to coordinate.
Speech latency
Fast first response keeps the interaction feeling live.
Model overhead
Use the models that fit your product without extra layers.
Inference path
One adaptable route for every user and context.
Dedicated hardware
A practical foundation for real-world product traffic.
Built for high-volume consumer interactions, with the latency and reliability teams need to keep shipping.
Realtime TTS
Keep every user engaged with natural, realtime text-to-speech
Fast first audio, expressive delivery, and controls that let your voice respond before users notice a delay.
Live voice direction
I’ll keep it clear, warm, and natural.
Advanced voice direction
Guide tone, speed, volume, pauses, and vocal style wherever the moment needs it.
Voice cloning
Create a custom voice from a short sample and carry its identity into new languages.
200+ languages
Reach more listeners with expressive multilingual speech without separate pipelines.
Text-led voice design
Describe an accent, age, energy, or attitude and turn the direction into a ready voice.
Realtime latency
Quick first audio and smooth streaming help agents answer while the conversation is still happening.
Voice AI that feels human, across every industry
Teams building at scale use Inworld to make every exchange sound more present, responsive, and alive.
“
Social companion platform
Emotionally expressive synthesis changes the quality of the whole interaction. When voice and conversational intelligence work together, the result feels genuinely human and nuanced.
Customer team
Voice product lead
Voice product lead
“
Interactive media studio
The level of steering is remarkable. Even highly specific direction stays natural, giving the experience a fresh axis instead of making every response sound the same.
Customer team
Creative technology lead
Creative technology lead
“
Learning application
Language learning should feel borderless. More expressive speech makes every lesson feel closer, clearer, and much more real.
Customer team
Product founder
Product founder
Realtime API
Controllable speech-to-speech that understands, reasons, and interacts
Speech in, speech out, over one WebSocket, with custom voices, context, and tool calling. Tune the experience around what your users care about most.
Live conversation
I’ve been following you.
Full duplex, low-latency streaming
Stream both directions over a single WebSocket or WebRTC connection.
Intelligent turn taking
Context-aware detection with adjustable eagerness for natural back-and-forth.
Function calling
Register tools in the middle of a session without breaking the audio flow.
Provider agnostic
Choose the model that fits your latency, quality, or capability needs.
Dynamic context management
Create, retrieve, remove, or shorten conversation context as the session grows.
Conversational intelligence
Use acoustic and metadata signals to understand what is said and how it is expressed.
Realtime Router
Reason in real time. Route to the best model and tools for every user and context
One API intelligently routes requests across leading models and hundreds of choices. Built-in analytics, failover, experiments, and selection logic help teams improve the signals that matter without rewriting their application.
curl 'https://api.inworld.ai/v1/chat/completions' \ -H "Content-Type: application/json" \ -H "Authorization: Basic $INWORLD_API_KEY" \ -d '{ "model": "inworld/user-aware", "messages": [{"role": "user", "content": "Hello"}], "extra_body": { "metadata": { "language": "es", "country": "MX", "audience": "new" } } }'
Top models
Most popular routes
by application traffic
by application traffic
#1Aurora 3 Flash
16%#2Northstar Max
14%#3Atlas Reasoner
12%#4Meridian Pro
12%#5Swift Core
10%#6Aurora 2.5
5%#7Vector 5.2
5%#8Kite K2.5
3%#9MiniMax M2.5
3%#10Aurora Lite
2%Use one integration point to test, observe, and change routes as your application evolves.
Realtime STT
Speech-to-text that truly understands your users in real time
Understand speech and context together with voice profiling, strong accuracy, and streaming that keeps up with the conversation.
Live transcription
I’ve been looking forward to this.
Realtime streaming
Bidirectional WebSocket streaming for live audio, plus synchronized transcription for files.
Built-in voice profiling
Five realtime signals per chunk, including emotion, age, accent, pitch, and style.
Semantic & acoustic VAD
Detect when speech starts and stops for natural, low-latency turn taking.
One unified API
One integration point for streaming and sync transcription with consistent auth and formatting.
High accuracy & custom vocabulary
Industry-leading recognition with custom terms for the names and language your product uses.
Word-level timestamps
Per-word timing for subtitles and search, with speaker labels for multi-party audio.
Security
Build with confidence on secure AI infrastructure
Enterprise-grade security and compliance are built into the platform from the start. A zero-trust foundation, continuous monitoring, and careful controls give teams a safer place to build the next generation of AI.
SOC 2 Type II
Certified
HIPAA
Compliant
GDPR
Compliant
Voice AI, side-by-side comparison
| Capability | Inworld | Provider A | Provider B | Provider C | Provider D |
|---|---|---|---|---|---|
| Natural conversational delivery | |||||
| Realtime latency | |||||
| Multi-turn aware speech synthesis | |||||
| Simple voice direction | |||||
| Advanced voice direction | |||||
| Voice cloning | |||||
| Text-based voice design | |||||
| Single customizable voice API | |||||
| User-aware model routing | |||||
| Optimized alphanumeric support |
Reviewed against public documentation and the latest independent voice evaluations. Capabilities can change as models and products evolve.
Start building
Join the teams building the next wave of AI applications with voice and intelligence that feel immediate.