ThunderPhone
Full-stack voice AI phone agent supporting inbound and outbound calls, bulk outbound campaigns, and mid-call switching across 40+ languages.
About ThunderPhone
ThunderPhone is a full-stack voice AI phone agent that can place and answer calls and run bulk outbound campaigns with pacing and retry policies. It blends multi-pass transcription with direct audio input to the LLM, making addresses, spellings, and slurred pronunciations less likely to turn into wrong answers. Whether for customer support, scheduling, or pre-sales consultation calls, the product helps conversations run smoothly. The system supports 40+ languages, understands accented and mixed-language calls, and can switch languages mid-conversation. For access, it offers a range of options from a no-code front end and native API access to custom enterprise deployments.
Best for
Best use cases
Automatically answer and handle customer support calls
Automatically handle appointment scheduling and pre-sales consultation calls
Run bulk outbound campaigns with pacing and retry policies
Handle multilingual calls with accents or mixed languages
Compare before choosing
The official comparison page states that US call center human agent costs start at about $0.67 per minute.
The official comparison page states that offshore call center human agent costs start at about $0.13 per minute.
The official comparison page states that other voice AI providers (Vapi, Retell, Bland) cost from about 7¢ per minute.
Features
Direct audio to LLM
Blends multi-pass transcription with direct audio input, making addresses, spellings, and slurred pronunciations less likely to become wrong answers.
Inbound, outbound, and bulk campaigns
Can place or answer calls and run bulk outbound campaigns with pacing and retry policies.
40+ language support
Understands accented and mixed-language calls and supports switching languages mid-conversation.
Flexible access
Offers multiple access options including a no-code front end, native API access, and custom enterprise deployment.
Pros
- Multi-pass transcription blended with direct audio LLM input makes addresses, spellings, and slurred pronunciations less likely to become wrong answers
- Supports 40+ languages, understands accented and mixed-language calls, and switches mid-conversation
- Covers inbound, outbound, and bulk outbound in one place, with pacing control and retries for outbound campaigns
- Flexible access, from a no-code front end to native API and custom enterprise deployment
Pricing Plans
Public per-minute billing
- Full-stack voice AI
* Pricing information is for reference only. Please refer to the latest announcement on ThunderPhone's official website.