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ThunderPhone
ThunderPhone is a voice AI platform for building, testing, and deploying production phone agents.
ThunderPhone is a voice AI platform designed to build, test, and deploy production phone agents across 47 languages. It runs over real telephony with HD Voice supported or embedded directly in sites and apps. The platform is built for real-world calls and meets healthcare and EU requirements with HIPAA and GDPR compliance, including BAA and DPA at no extra charge. It features native SIP trunking, DTMF capture, handling for interruptions and backchannels, voicemail and screener detection, and warm or cold transfers. Agents are grounded in user documents with built-in retrieval, and operators can use live supervision to whisper guidance. The system offers code, no-code, and white-glove options, with public status monitoring and automated agent updates based on call scoring.
ThunderPhone at a glance
- Best for: Support, Founder
- Runs on: Web, API
- Pricing: Spark starts at 2 cents/minute; pricing starts at 2 cents per minute with no platform fee.
- Released: August 2026
- Category: AI agent tool
- Website: thunderphone.com
Key features
- Native SIP trunking
- DTMF capture
- Voicemail & screener detection
- Knowledge grounding
- Live supervision
- Role-based team access
- Automated agent updates
Use it for
- Customer support calls
- Scheduling appointments
- Pre-sales conversations
- Inbound calls and outbound campaigns
Alternatives to ThunderPhone
- Sierra — Enterprise support agents with outcome-based pricing
- Voiceflow — Visual builder for support agents across chat, voice and WhatsApp
- Agentforce — AI agents that act on Salesforce data with built-in guardrails
- Dial — Provision a real phone number for AI agents in seconds with one API.
- Cald.ai — It uses advanced LLMs and speech models to deliver human-like, low-latency phone interactions.
- Vapi — Provides scalable orchestration for voice AI agents with sub-500ms latency.
- Keiki — Deploy one AI agent across multiple messaging channels with built-in tools and memory.
- Retell AI — It handles phone calls with low-latency responsiveness and high workflow accuracy.
- Synthflow — Delivers sub-100 ms latency with custom telephony and enterprise integrations.
- Harmony AI — Deploys revenue-trained voice agents with sub-second response times.
- Ada — Enterprise AI agent that can act in business systems, not just reply
- Decagon — Agent behavior written in plain language, not config code
All ThunderPhone alternatives