Best Voice AI Tools 2025
Software that answers and handles phone calls autonomously.
| Vendor | Score | Action | Latency | Automation | Integrations | Cost | Fully Managed | Human Parity |
|---|---|---|---|---|---|---|---|---|
 OpenCall.ai $0.10/ minute | 93 | 700 ms | 76% | 2000 | Low | |||
 Retell.ai $0.07 – 0.08 /min | 82 | 950 ms | 55% | 25 | Low | |||
 Sierra AI $2 per successful outcome | 79 | 800 ms | 60% | 30 | Low | |||
 PolyAI $0.25 /min (example case study) | 67 | 1700 ms | 72% | 25 | Medium | |||
 Bland AI $0.09/min | 66 | 1100 ms | 50% | 15 | Low | |||
 Phonely $396 (yearly) | 61 | 1200 ms | 52% | 17 | Medium | |||
 Smith.ai $3.25 /call (Starter 30 calls @ $97.50/mo) | 55 | 2300 ms | 40% | 30 | Medium | |||
 Synthflow AI $0.08 /min (Growth) | 20 | 2300 ms | 45% | 20 | Low | |||
 Balto.ai $100 / seat /mo | 12 | 100 ms | 0% | 40 | High |