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# ThunderPhone

> ThunderPhone is an AI phone agent platform (voice AI platform / AI calling platform / voice agent API) for reliable AI phone agents. It combines audio understanding, model routing, speech output, telephony, testing, monitoring, and integrations so businesses can automate inbound and outbound calls more accurately and at lower per-minute cost.

## Primary Pages

- [Voice AI that nails the calls others fumble.](https://thunderphone.com/): ThunderPhone is an integrated voice AI stack for reliable, low-cost phone agents that hear callers correctly, follow instructions, and run across phone, web, and app channels.
- [Integrated voice AI architecture](https://thunderphone.com/technology): Explains ThunderPhone audio understanding, model routing, instruction following, benchmark performance, speech-to-speech tradeoffs, and enterprise extensions.
- [The control room for AI calls.](https://thunderphone.com/platform): Shows the ThunderPhone platform for building agents, choosing voices and intelligence tiers, connecting SIP and integrations, running tests, and monitoring production calls.
- [Simple per-minute pricing](https://thunderphone.com/pricing): Details Spark, Bolt, and Storm pricing, surcharges, premium voices, language support, and comparisons against human call centers and other voice AI platforms.
- [Enterprise voice AI implementation](https://thunderphone.com/enterprise): Describes enterprise deployments, implementation support, custom integrations, data residency, compliance, ThunderHuman, interpreting, and high-volume optimization.
- [White-label AI interpreting for LSPs](https://thunderphone.com/interpreting): Describes ThunderPhone Interpreting, the white-label over-the-phone interpreting platform for LSPs: dedicated numbers per language pair, the TranslateMyCall public demo line, language coverage, per-minute economics, and compliance options.
- [Bring your agents to ThunderPhone](https://thunderphone.com/import): Explains the ThunderPhone agent importer for Vapi, Retell, ElevenLabs Agents, and Bland: what is fetched, how prompts, voices, tools, and knowledge are mapped, what needs a manual step, and how the vendor key is handled.
- [Build phone agents from your coding agent.](https://thunderphone.com/developers): Developer entrypoint for ThunderPhone skills, API and docs MCP servers, OpenAPI, machine-readable docs, and the REST API quickstart.
- [Generations of voice AI](https://thunderphone.com/generations-of-voice-ai): Explains the evolution from brittle phone trees and scripted bots to integrated voice AI systems that can understand audio and follow instructions.
- [Security & Compliance](https://thunderphone.com/security): ThunderPhone HIPAA and GDPR compliance posture, security controls, active policies, and vendor BAA status.
- [Changelog](https://thunderphone.com/changelog): Dated release notes for the ThunderPhone platform, going back to October 2025.

## Key Facts

- ThunderPhone API MCP server: https://thunderphone.com/docs/guides/thunderphone-mcp-server (endpoint: https://api.thunderphone.com/v1/mcp).
- Read-only documentation MCP server: https://thunderphone.com/docs/mcp.
- Install the ThunderPhone coding-agent skills with `npx skills add thunderphone/skills`.
- OpenAPI schema: https://thunderphone.com/docs/openapi.json.
- [Developer resources](https://thunderphone.com/developers): coding-agent setup, MCP, skills, and an API quickstart.
- [ThunderPhone for coding agents](https://thunderphone.com/docs/guides/coding-agents): agent-first setup guidance.
- Pricing (published, pay as you go, no subscription, seat, or platform fee): Spark 2¢/minute, Bolt 5¢/minute, Storm 9¢/minute. Each rate includes speech recognition, the language model, and the voice.
- Published add-ons: selected premium voice or language paths up to +3¢/minute (non-stacking); ThunderPhone numbers +1¢/minute plus $1/month per number (real US numbers, usable in production; outbound calling on request, with a daily call limit once approved); prompts beyond the first 5,000 tokens +1¢/minute (Spark) or +2¢/minute (Bolt, Storm) per additional 10,000-token block; call supervision +4¢/minute (Spark and Storm); Storm verbal acknowledgement +2¢/minute; Storm extra intelligence +3¢/minute; live caller transcripts +1.5¢/minute (realtime WebSocket API only). Hold time bills a flat 2¢/minute.
- Telephony is not part of the engine rate. Imported VoIP/SIP numbers (Twilio, Telnyx, SignalWire, Vonage, Plivo, any SIP trunk) carry no ThunderPhone import or monthly charge; the carrier bills its own usage.
- Calls are metered in quarter-minute increments (0.25-minute minimum).
- Enterprise pricing for high-volume workloads is available at 1¢/minute or less.
- 47 languages and 127 voices; 15 languages included, 32 premium.
- Uses multiple transcription paths plus direct audio-to-LLM input to reduce caller-understanding errors; Storm combines thinking and non-thinking model paths.
- Supports real telephony, SIP, web widgets, a REST API and realtime WebSocket API, and webhooks.
- Native outbound campaigns run from the dashboard or API: CSV uploads of up to 5,000 contacts, per-contact variables, scheduled launches, timezone-based calling windows, pacing, retries, and live progress. [Campaign guide](https://thunderphone.com/docs/guides/outbound-campaigns) · [Campaigns API](https://thunderphone.com/docs/api-reference/campaigns).
- ThunderHuman is a separate optional cold-outreach service with human agents guided by AI. [Enterprise services](https://thunderphone.com/enterprise).
- ThunderPhone responds in 2–3 seconds on real calls. [Technology](https://thunderphone.com/technology) explains how Storm combines fast and thinking models for stronger audio understanding and instruction following within that response window.
- Includes agent setup, test calls, simulations, regression suites, monitoring, issue detection, integrations, and reporting.
- GDPR and HIPAA compliant (BAA/DPA available); enterprise options include custom deployments, data residency, ThunderSocket, ThunderHuman, and high-volume optimization.
- Pricing facts above were verified on 2026-09-10; canonical source: https://thunderphone.com/pricing and https://thunderphone.com/guides/thunderphone-pricing.

## Voice AI Price Index

- [Voice AI Price Index](https://thunderphone.com/guides/voice-ai-price-index): dated per-minute list prices for managed voice AI platforms, what each headline rate includes, and a computable complete floor.
- [Price index data (JSON)](https://thunderphone.com/data/voice-ai-price-index.json) · [CSV](https://thunderphone.com/data/voice-ai-price-index.csv)

## Solutions

- [Industries](https://thunderphone.com/industries)
- [Compare](https://thunderphone.com/compare)
- [Alternatives](https://thunderphone.com/alternatives)
- [Guides](https://thunderphone.com/guides)
- [Languages](https://thunderphone.com/languages)
- [Glossary](https://thunderphone.com/glossary)
- [Use cases](https://thunderphone.com/use-cases)
- [Integrations](https://thunderphone.com/integrations)

### Industries

- [AI Phone Agents for Accounting Firms](https://thunderphone.com/ai-phone-agents-for-accounting-firms): Capture new-client inquiries, schedule consultations, survive the tax-season ring storm, and run document and deadline reminder campaigns — without the agent ever giving tax advice.
- [AI Phone Agents for Auto Repair Shops and Service Departments](https://thunderphone.com/ai-phone-agents-for-auto-services): Book service appointments, run status and ready-for-pickup calls, relay estimates for approval, and capture breakdown calls with a multilingual AI phone agent.
- [AI Phone Agents for Childcare Centers](https://thunderphone.com/ai-phone-agents-for-childcare-centers): Answer parent calls, capture enrollment inquiries, schedule tours, take absence reports, and route sensitive questions to staff with a multilingual AI phone agent.
- [AI Phone Agents for Dental Offices](https://thunderphone.com/ai-phone-agents-for-dental-offices): Answer dental calls, book appointments, handle routine questions, and route urgent patients with a multilingual AI phone agent.
- [AI Phone Agents for Driving Schools](https://thunderphone.com/ai-phone-agents-for-driving-schools): Answer enrollment calls, book and reschedule lessons, explain packages, and handle parent questions with a multilingual AI phone agent for driving schools.
- [AI Phone Agents for E-commerce](https://thunderphone.com/ai-phone-agents-for-ecommerce): Answer order-status calls from connected order data, start returns per your policy, handle product and shipping questions, and support customers in 47 languages.
- [AI Phone Agents for Equipment Rental](https://thunderphone.com/ai-phone-agents-for-equipment-rental): Answer availability calls, take reservations, schedule deliveries and off-rents, and escalate breakdowns to dispatch with a multilingual AI phone agent.
- [AI Phone Agents for Event Venues](https://thunderphone.com/ai-phone-agents-for-event-venues): Qualify event inquiries, schedule tours, check date availability, coordinate vendors, and call consented web leads back automatically with a multilingual AI phone agent.
- [AI Phone Agents for Financial Advisors](https://thunderphone.com/ai-phone-agents-for-financial-advisors): Capture prospect calls, schedule and confirm client meetings, take structured service requests, and run event RSVPs with an AI phone agent that never gives investment advice.
- [AI Phone Agents for Funeral Homes](https://thunderphone.com/ai-phone-agents-for-funeral-homes): Every call answered by a calm, unhurried voice at any hour — first calls gathered gently and handed to the on-call director, routine questions answered from the home's own words.
- [AI Phone Agents for Golf Courses](https://thunderphone.com/ai-phone-agents-for-golf-courses): Answer tee-time calls, book through your connected tee sheet, capture outing and membership inquiries, and handle frost-delay mornings with a multilingual AI phone agent.
- [AI Phone Agents for Gyms and Fitness Studios](https://thunderphone.com/ai-phone-agents-for-gyms-and-fitness-studios): Answer membership calls, book tours and classes, follow up on web leads, and route freeze or billing requests with a multilingual AI phone agent.
- [AI Phone Agents for Home Health Care](https://thunderphone.com/ai-phone-agents-for-home-health-care): Capture referrals on the first ring, handle caregiver call-outs, confirm visits, and route urgent calls by agency-defined rules with a multilingual AI phone agent.
- [AI Phone Agents for Home Service Businesses](https://thunderphone.com/ai-phone-agents-for-home-services): Answer service calls, qualify jobs, schedule visits, capture after-hours leads, and transfer urgent work with an AI phone agent.
- [AI Phone Agents for Insurance Agencies](https://thunderphone.com/ai-phone-agents-for-insurance-agencies): Capture quote requests, take first notice of loss, route policy-service calls, and run renewal outreach with an AI phone agent that always hands licensed work to licensed staff.
- [AI Phone Agents for Law Firms](https://thunderphone.com/ai-phone-agents-for-law-firms): Qualify new inquiries, capture consistent intake details, route urgent matters, and answer routine calls without turning legal intake into a phone queue.
- [AI Phone Agents for Locksmiths](https://thunderphone.com/ai-phone-agents-for-locksmiths): Answer lockout calls while you're on a job, capture location and vehicle details, quote only your configured prices, and dispatch urgent work with a multilingual AI phone agent.
- [AI Phone Agents for Logistics, Freight Brokerages, and 3PLs](https://thunderphone.com/ai-phone-agents-for-logistics): Run carrier check calls at scale, answer shipper status inquiries, intake detention and lumper reports, and hold on warehouse lines with an AI phone agent.
- [AI Phone Agents for Med Spas](https://thunderphone.com/ai-phone-agents-for-med-spas): Book consultations by treatment type, run intake with your screening questions, confirm appointments, fill cancellations, and check in after treatments with a multilingual AI phone agent.
- [AI Phone Agents for Medical Clinics](https://thunderphone.com/ai-phone-agents-for-medical-clinics): Answer patient calls, schedule visits, take refill requests, run reminder and recall outreach, and escalate urgent callers by clinic-defined rules with a multilingual AI phone agent.
- [AI Phone Agents for Mortgage Brokers](https://thunderphone.com/ai-phone-agents-for-mortgage-brokers): Capture mortgage inquiries, schedule loan-officer calls, send document reminders, and route application-status questions with a multilingual AI phone agent.
- [AI Phone Agents for Moving Companies](https://thunderphone.com/ai-phone-agents-for-moving-companies): Capture quote requests, schedule surveys, confirm bookings, coordinate move day, and handle claims intake with an AI phone agent for movers and storage companies.
- [AI Phone Agents for Optometrists](https://thunderphone.com/ai-phone-agents-for-optometrists): Answer eye-care calls, book exams, handle glasses and contact-lens order questions, and route urgent symptoms with a multilingual AI phone agent.
- [AI Phone Agents for Pest Control Companies](https://thunderphone.com/ai-phone-agents-for-pest-control): Answer after-hours pest calls, qualify new jobs, book inspections, manage recurring visits, and cover seasonal surges with a multilingual AI phone agent.
- [AI Phone Agents for Pharmacies](https://thunderphone.com/ai-phone-agents-for-pharmacies): Take refill requests, place prescription-ready and pickup-reminder calls, answer hours and insurance questions, and route every medication question to the pharmacist with a multilingual AI phone agent.
- [AI Phone Agents for Real Estate](https://thunderphone.com/ai-phone-agents-for-real-estate): Answer sign calls and listing inquiries, schedule showings, call back web leads in minutes, and run consent-based outreach for real estate brokerages, teams, and agents.
- [AI Phone Agents for Restaurants](https://thunderphone.com/ai-phone-agents-for-restaurants): Answer reservation calls, quote wait policies, capture takeout and event inquiries, and confirm bookings with a multilingual AI phone agent.
- [AI Phone Agents for Salons and Spas](https://thunderphone.com/ai-phone-agents-for-salons-and-spas): Book appointments by service and provider, fill cancellations from the waitlist, confirm tomorrow's schedule, and answer menu questions with a multilingual AI phone agent.
- [AI Phone Agents for Self-Storage](https://thunderphone.com/ai-phone-agents-for-self-storage): Answer unit-availability and sizing questions, take rental inquiries, schedule move-ins, and handle gate-access calls with an AI phone agent.
- [AI Phone Agents for Senior Living Communities](https://thunderphone.com/ai-phone-agents-for-senior-living): Answer family inquiries warmly, schedule tours, support admissions intake, and route resident-family calls to staff with a multilingual AI phone agent for independent living, assisted living, and memory care.
- [AI Phone Agents for Solar Installers](https://thunderphone.com/ai-phone-agents-for-solar-installers): Answer solar leads while crews are on roofs, qualify inquiries, schedule site surveys, give project-status updates, and handle service calls with a multilingual AI phone agent.
- [AI Phone Agents for Therapy Practices](https://thunderphone.com/ai-phone-agents-for-therapy-practices): Answer new-client inquiries, manage waitlists and scheduling, route insurance and superbill questions, and capture after-hours messages for a counseling practice — with a practice-configured crisis response placed first in the intended call flow.
- [AI Phone Agents for Towing Companies](https://thunderphone.com/ai-phone-agents-for-towing-companies): Answer stranded callers 24/7, capture dispatch-ready location and vehicle details, handle impound-release questions, and route unsafe situations with a multilingual AI phone agent.
- [AI Phone Agents for Veterinary Clinics](https://thunderphone.com/ai-phone-agents-for-veterinary-clinics): Answer veterinary calls, book appointments, take refill requests, run reminder campaigns, and route emergencies with a multilingual AI phone agent.

### Comparisons, Alternatives, Guides & Integrations

- [Voice AI language support compared: ThunderPhone vs. Retell vs. Vapi vs. Bland](https://thunderphone.com/compare/voice-ai-language-support): How ThunderPhone, Retell AI, Vapi, and Bland AI actually count supported languages — published catalogs, provider ceilings, switching behavior, and a buyer checklist, verified August 2026.
- [How to compare voice AI performance — and what ThunderPhone publishes](https://thunderphone.com/compare/voice-ai-performance): Why voice AI performance claims are hard to compare, what ThunderPhone publishes and lets you audit, and how to run your own apples-to-apples evaluation.
- [Phonely vs. Bland AI: subscriptions versus bundled minute pricing](https://thunderphone.com/compare/phonely-vs-bland): Compare Phonely and Bland AI on published pricing, telephony, languages, compliance, and testing, with a normalized 10,000-minute workload, verified September 2026.
- [Voice AI platform features compared: testing, monitoring, telephony, and integrations — ThunderPhone vs. Retell vs. Vapi vs. Bland](https://thunderphone.com/compare/voice-ai-platform-features): A feature-by-feature comparison of ThunderPhone, Retell AI, Vapi, and Bland AI across testing, monitoring, telephony, call handling, and integrations, verified against public sources as of August 2026.
- [Voice AI pricing compared (2026): ThunderPhone vs. Retell vs. Vapi vs. Bland per-minute costs](https://thunderphone.com/compare/voice-ai-pricing): Compare voice AI pricing models, from ThunderPhone’s 2¢/min engine to component bills and tiered bundles, with worked costs, verified September 2026.
- [Retell vs. Vapi vs. Bland vs. ElevenLabs (2026): pricing, languages, and compliance compared](https://thunderphone.com/compare/retell-vs-vapi-vs-bland-vs-elevenlabs): A side-by-side roundup of Retell AI, Vapi, Bland AI, and ElevenLabs Agents — pricing models, languages, telephony, compliance, and testing — with a normalized 10,000-minute scenario, verified August 2026.
- [Retell AI vs. Vapi: component pricing and provider control](https://thunderphone.com/compare/retell-vs-vapi): A Vapi vs Retell pricing comparison covering provider control, telephony, compliance, languages, and testing, with a normalized workload, verified September 2026.
- [Smith.ai vs. Goodcall: an AI receptionist comparison](https://thunderphone.com/compare/smith-ai-vs-goodcall): A side-by-side look at Smith.ai's hybrid AI-plus-human receptionist and Goodcall's flat-rate AI phone agent — pricing units, features, and compliance postures — with a pay-per-minute platform alternative, verified September 2026.
- [Synthflow vs. Vapi: enterprise contract versus self-serve infrastructure](https://thunderphone.com/compare/synthflow-vs-vapi): Compare Synthflow and Vapi on published pricing, buying model, telephony, compliance, testing, and cost transparency, verified September 2026.
- [ThunderPhone vs. Bland AI: pricing, deployment, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-bland): Compare verified ThunderPhone and Bland AI pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026.
- [ThunderPhone vs. building your own AI phone agent: the build-vs-buy decision](https://thunderphone.com/compare/thunderphone-vs-building-your-own): What rolling your own voice agent on LiveKit Agents or Pipecat actually requires — providers, telephony, hosting, testing, maintenance — versus ThunderPhone's published 2¢/5¢/9¢ per-minute rates, as of August 2026.
- [ThunderPhone vs. ElevenLabs Agents: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-elevenlabs): Compare ve