Powering the Next Wave
of AI Applications
Status reached 1M DAUs in 19 days.
OtherHalf powers voice-first companions at scale.
Ongoing, personal, emotionally engaging AI interaction. Build for relationship-building, emotional connection, and entertainment at scale.
Inworld TTS
The fastest, highest-quality voice AI
#1 on Artificial Analysis. Purpose-built for realtime conversation with sub-200ms latency, at a fraction of the cost of other providers.
Inworld Router
One API. The best model for every user and context.
Route requests across OpenAI, Anthropic, Google, and 200+ models through a single API. Built-in failover, A/B testing, and automatic model selection with no code changes required.
curl 'https://api.inworld.ai/v1/chat/completions' \
-H "Content-Type: application/json" \
-H "Authorization: Basic $INWORLD_API_KEY" \
-d '{ "model": "inworld/smartest-model", "messages": [{"role": "user", "content": "Hello"}]
}'Use it with:+ many more
Top Models
#1Gemini 3 Flash
16%#2Qwen3 Max
14%#3Claude Sonnet 4.6
12%#4Claude Opus 4.6
12%#5Grok 4.1 Fast
10%#6Gemini 2.5 Flash
5%#7GPT 5.2
5%#8Kimi K2.5
3%#9MiniMax M2.5
3%#10Gemini 2.5 Flash Lite
2%Inworld STT
Speech-to-text that truly understands your users in realtime.
Realtime streaming recognition with diarization and custom vocabularies. Built for interactive audio.
Live transcription
Learner
lang fr-FRgender femalestyle hesitantage youngJe voudrais réserver une table pour deux personnes, s'il vous plaît.
Tutor
lang en-USgender malestyle encouragingage oldExcellent pronunciation! Try softening the 'r' in réserver. Let's hear it one more time.
Realtime streamingRealtime, bidirectional streaming over WebSocket for live audio, or synchronous transcription for complete audio files.
Semantic & acoustic VADAutomatically detect when speech starts and stops. Enable natural speech patterns.
Voice & context profilingUnderstand the profile, context and state of your users to contextualize responses.
Unified multi-provider APIA single integration point for industry-leading, high-accuracy transcription providers, with consistent authentication, request formatting, and response handling.
High accuracy & custom vocabularyTranscribe audio with industry-leading accuracy. Add domain-specific terms, product names, and specialized vocabulary to boost recognition further.
Word-level timestamps & diarizationPer-word timing for subtitles and search. Label speakers in multi-party conversations.
Inworld Realtime API
Speech-to-Speech that puts you and your users in control.
Low-latency, natural speech-to-speech experiences via one API. Built-in multimodal capabilities, function calling and turn taking.
Live conversation
User
turn_detection semantic_vadeagerness mediumemotion stressedage youngI've been feeling really overwhelmed lately. I don't even know where to start.
Companion
voice Lunaoutput_modalities text, audioThat's completely valid. Let's take a breath together first, then we can talk through what's on your mind — one thing at a time.
Full duplex, low-latency streamingFull-duplex audio streaming over a single WebSocket or WebRTC connection.
Intelligent turn takingContext-aware turn detection with adjustable eagerness.
Function callingRegister tools mid-session. The assistant calls your functions without breaking audio.
Provider agnosticRoute to the model that fits your latency, cost, or quality requirements, and swap it out at any time.
Dynamic context managementCreate, retrieve, delete, or truncate conversation items mid-session to control context length and token cost.
Conversational intelligenceUse acoustic and metadata signals to condition what is said, when it is said, and how it is expressed.
Security
Build with confidence on secure AI infrastructure
Enterprise-grade security and compliance built into our AI platform.
Built on a zero-trust framework with continuous monitoring, providing
a secure foundation for teams building the next generation of AI.
SOC2 Type II
Certified
HIPAA
Compliant
GDPR
Compliant
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Join millions of developers building the next wave of AI applications.