Cartesia Sonic-3 is a real-time text-to-speech API that generates natural, expressive voices with laughter in over 40 languages. It is designed for AI agents and interactive apps, offering instant voice cloning and ultra-low latency voice AI. The platform provides a range of plans, including a free tier, to cater to different use cases and scales. Cartesia Sonic-3 is used by developers and businesses looking to integrate high-quality voice AI into their applications.
Recommended for
Solo / IndieSeed
Solo / IndieSeedSeries AScaleupLate-StagePublic / Enterprise
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Added on
Apr 9, 2026
SSIE Stage Fit Recommendation
Following data shows why Cartesia Sonic-3 is recommended for listed teams.
| Stage | Stage Fit Reasons |
|---|---|
| Solo / Indie1 person with$0–$2,000 MRR |
|
| Seed5–15 people with$10k–$100k MRR |
|
| Series A15–50 people with$100k–$500k MRR |
|
| Scaleup50–200 people with$500k–$2M+ MRR |
|
| Late-Stage200–1,000+ people with$2M+ MRR |
|
| Public / Enterprise1,000+ people with$100M+ ARR |
|
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