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ThunderPhone

](/products/thunderphone/reviews)

(2)5.0/5

ThunderPhone is a self-serve platform for building AI phone agents, with usage-based pricing starting at $0.02 per minute — models included, so there are no separate LLM, transcription, or voice bills. Its Storm tier with the extra-intelligence option scores 99.4% on Big Bench Audio — the top score on the Artificial Analysis leaderboard — with the evaluation set public on Hugging Face. Teams build agents in a no-code builder or via API, test them like software with AI-caller simulations and regression suites, and monitor live calls with the ability to steer conversations in real time. Production monitoring automatically detects issues in calls and proposes fixes. ThunderPhone handles inbound and outbound calls for customer support, scheduling, pre-sales intake, and reminders, with TCPA-compliant outbound calling, voicemail detection, and warm transfers. It supports 47 languages with mid-call language switching, captures details like addresses and product codes accurately even amid noise and accents, and connects to existing telephony via SIP trunking or provisions phone numbers directly. Pricing tiers: Spark at $0.02/min, Bolt at $0.05/min, and Storm at $0.09/min, with an extra-intelligence add-on at $0.03/min. ThunderPhone is HIPAA and GDPR compliant, offers API and MCP access, and has a live demo on its homepage.

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