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Inworld
✓ verifiedFreemium
Realtime voice AI platform offering low-latency TTS, STT and multi-provider LLM routing for developers building conversational apps.
489K visits/mo12K saves
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Synthflow AI
✓ verifiedPaid
Enterprise voice AI platform with in-house telephony for building and running automated inbound/outbound phone agents at scale.
125K visits/mo11K saves
Pricing
On-Demand: $0 (pay-as-you-go, up to 70 min TTS free)
Creator: $25/mo ($25 credits, 500 custom voices)
Builder: $100/mo ($100 credits, 3,000 voices)
Developer: $300/mo ($300 credits, 10,000 voices)
Growth: $1,500/mo ($1,500 credits, 30,000 voices)
Enterprise: $30,000+/year (custom-scoped to call volume, concurrency and integrations)
Core features
- ✦Realtime TTS-2 with voice cloning, design and inline direction
- ✦Speech-to-text with voice profiling, diarization and timestamps
- ✦End-to-end speech-to-speech Realtime API over WebSocket/WebRTC
- ✦LLM Router across OpenAI, Anthropic, Google and 220+ models at cost
- ✦100+ languages with cross-lingual voice cloning
- ✦SOC 2 Type II, HIPAA and GDPR compliance
- ✦Visual flow designer for building voice agent logic
- ✦Automated test center that simulates calls before launch
- ✦In-house telephony network with sub-100ms latency claims
- ✦Real-time call monitoring, auto-QA and analytics
- ✦Multi-agent architecture with specialized subflows
- ✦Omnichannel deployment across voice, chat and SMS
- ✦Integrations with CRMs and enterprise telephony (Cisco, Avaya, Genesys)
Use cases
- →Voice-first companion and consumer apps
- →Customer support and conversational agents
- →Language learning and education tools
- →Interactive game NPCs and media
- →Routing LLM traffic to optimize cost, latency or quality
- →Enterprises automating high-volume inbound customer service calls
- →Healthcare and financial services deploying compliant voice agents
- →BPOs replacing manual call handling with AI receptionists
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