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ThunderPhone

ThunderPhone

AI

Voice AI platform for building inbound and outbound phone agents, priced from 2 cents per minute with record-setting audio accuracy.

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About ThunderPhone

ThunderPhone is a full-stack voice AI platform for building phone agents that place and receive real calls over PSTN/SIP telephony, or run embedded in a website or app. It fuses multiple transcription streams with direct audio-to-LLM input so accents, background noise, spelled-out part numbers and mumbled addresses do not turn into wrong answers — the platform reports 99.4% on the Big Bench Audio benchmark. Three flat per-minute model tiers (Spark at 2 cents, Bolt at 5 cents, Storm at 9 cents) let teams trade latency against audio understanding and instruction following without an itemized transcription-plus-LLM-plus-voice stack. Agents can be built in a no-code operator front end with knowledge bases, A/B experiments, outbound campaigns and AI-graded test calls, or driven directly through a REST API against the same voice runtime. It supports 40+ languages with mid-call switching, native SIP trunking, DTMF capture, voicemail and screener detection, warm and cold transfers, live supervision with whisper guidance, and HIPAA/GDPR compliance with BAA and DPA at no extra charge.

Screenshots

ThunderPhone screenshot 1
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Key Features

Multi-Transcript Audio Fusion: Combines several transcription models with direct audio-to-LLM input so noisy calls, accents and spelled-out identifiers resolve correctly instead of drifting off-script.
Three Flat Per-Minute Tiers: Spark (2c), Bolt (5c) and Storm (9c) trade latency against audio understanding and instruction following, and a workload can be moved between tiers at any time.
Inbound and Outbound Campaigns: Place or receive calls, or run bulk outbound campaigns with pacing and retries, including TCPA-compliant cold outbound via ThunderHuman.
40+ Language Support: Understands accents and mixed-language calls and switches language mid-conversation when a caller asks.
Native SIP Trunking and DTMF: Connects existing telephony without rebuilding routing and handles keypad input for IVRs and confirmations.
Knowledge Grounding: Agents answer from uploaded documents with built-in retrieval, with search testing before deployment.
Live Supervision: Watch calls in progress and whisper guidance to the AI mid-conversation without the caller hearing.
No-Code Platform plus REST API: Operators launch agents from a front end with A/B experiments and AI-graded test calls, while developers POST to /v1/calls against the same runtime.

Use Cases

24/7 Front Desk: Answering inbound customer support and reception calls around the clock without staffing a night shift.
Appointment Scheduling and Reminders: Running outbound reminder and rescheduling campaigns with pacing and automatic retries.
Parts and Inventory Lookup: Handling field-service calls where part numbers and addresses must be transcribed exactly under site noise.
Pre-Sales Qualification: Screening inbound leads and warm-transferring qualified callers to a human with context preserved.
Healthcare Call Automation: Running patient-facing phone workflows under a HIPAA BAA with US data residency.
Call Center Cost Reduction: Replacing outsourced per-minute agent spend with a 2-9 cent per-minute automated stack.
Embedded In-App Voice: Adding a voice agent inside a web or mobile product using the same runtime as the phone channel.

Frequently asked questions about ThunderPhone

What is ThunderPhone?

Voice AI platform for building inbound and outbound phone agents, priced from 2 cents per minute with record-setting audio accuracy.

How does ThunderPhone work?

ThunderPhone works by combining Multi-Transcript Audio Fusion: Combines several transcription models with direct audio-to-LLM input so noisy calls, accents and spelled-out identifiers resolve correctly instead of drifting off-script., Three Flat Per-Minute Tiers: Spark (2c), Bolt (5c) and Storm (9c) trade latency against audio understanding and instruction following, and a workload can be moved between tiers at any time., Inbound and Outbound Campaigns: Place or receive calls, or run bulk outbound campaigns with pacing and retries, including TCPA-compliant cold outbound via ThunderHuman., 40+ Language Support: Understands accents and mixed-language calls and switches language mid-conversation when a caller asks., Native SIP Trunking and DTMF: Connects existing telephony without rebuilding routing and handles keypad input for IVRs and confirmations. to help users with 24/7 Front Desk: Answering inbound customer support and reception calls around the clock without staffing a night shift., Appointment Scheduling and Reminders: Running outbound reminder and rescheduling campaigns with pacing and automatic retries., Parts and Inventory Lookup: Handling field-service calls where part numbers and addresses must be transcribed exactly under site noise., Pre-Sales Qualification: Screening inbound leads and warm-transferring qualified callers to a human with context preserved., Healthcare Call Automation: Running patient-facing phone workflows under a HIPAA BAA with US data residency..

What are the main features of ThunderPhone?

Key features include Multi-Transcript Audio Fusion: Combines several transcription models with direct audio-to-LLM input so noisy calls, accents and spelled-out identifiers resolve correctly instead of drifting off-script., Three Flat Per-Minute Tiers: Spark (2c), Bolt (5c) and Storm (9c) trade latency against audio understanding and instruction following, and a workload can be moved between tiers at any time., Inbound and Outbound Campaigns: Place or receive calls, or run bulk outbound campaigns with pacing and retries, including TCPA-compliant cold outbound via ThunderHuman., 40+ Language Support: Understands accents and mixed-language calls and switches language mid-conversation when a caller asks., Native SIP Trunking and DTMF: Connects existing telephony without rebuilding routing and handles keypad input for IVRs and confirmations..

Who is ThunderPhone for?

ThunderPhone is useful for anyone interested in 24/7 Front Desk: Answering inbound customer support and reception calls around the clock without staffing a night shift., Appointment Scheduling and Reminders: Running outbound reminder and rescheduling campaigns with pacing and automatic retries., Parts and Inventory Lookup: Handling field-service calls where part numbers and addresses must be transcribed exactly under site noise., Pre-Sales Qualification: Screening inbound leads and warm-transferring qualified callers to a human with context preserved., Healthcare Call Automation: Running patient-facing phone workflows under a HIPAA BAA with US data residency..

How much does ThunderPhone cost?

ThunderPhone is a paid product. Check the official site for current pricing.

How do I get started with ThunderPhone?

Visit https://thunderphone.com/ to sign up and explore ThunderPhone.

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