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Ultra-low-latency real-time voice AI built for conversational agents.
Pros
- Among the lowest latency in the market for live agents
- Roughly one-fifth the cost of ElevenLabs on self-serve TTS
- Strong startup grant (4 months of Scale free)
Cons
- Developer-focused; no polished no-code studio for creators
- Smaller voice library than incumbents
- No dedicated consumer affiliate program
✓ Where it shines / best for
- Developers building real-time conversational voice agents
- Low-latency interactive voice applications
- Products needing custom cloned voices at scale
- Teams replacing higher-latency TTS in live pipelines
✕ Not the best fit for
- Non-developers wanting a finished editing UI
- Users primarily needing video editing or dubbing
- Offline batch voiceover where latency is irrelevant
Features
- ✓ Sonic ultra-low-latency text-to-speech for real-time agents
- ✓ Instant voice cloning (Pro plan) and high-quality Pro Voice Cloning (Startup+)
- ✓ Ink speech-to-text / transcription (billed 1 credit per second of audio)
- ✓ Streaming TTS API designed for conversational voice agents
- ✓ TTS billed 1 credit per character; large expressive multilingual voice library
- ✓ Voice control over speed, emotion, and pronunciation
- ✓ WebSocket streaming for real-time apps
- ✓ On-device / self-hosted deployment options for enterprise
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Free | $0 | monthly | 20K credits/month + $1 prepaid agent minutes; TTS and STT access |
| Pro | $4 | monthly | Billed annually; 100K credits/month + $5 agent minutes; commercial license, instant voice cloning |
| Startup | $39 | monthly | 1.25M credits/month + $49 agent minutes; Pro voice cloning, organizations support |
| Scale | $239 | monthly | 8M credits/month + $299 agent minutes; priority support, high concurrency |
| Enterprise | Custom | custom | Custom credits/concurrency, DPAs/BAAs, SSO, SLAs, custom models |
Pricing verified from the official source. Prices change often — confirm on the vendor's site before buying.
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