Free tools
Calculators and utilities for people building agents that call, text, and email. Free, no signup, built on the same open data that powers Hail.
AI Voice Agent Cost Calculator
Estimate what an AI phone agent costs per call, per minute, and per month — STT, LLM, TTS, and telephony, priced from the live Hail costs dataset.
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SMS Length & Segment Calculator
Count characters and segments, detect GSM-7 vs UCS-2 encoding, see which characters force the expensive encoding, and estimate sending cost.
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Email Deliverability Checker
Live SPF, DKIM, DMARC, and MX checks for any domain, graded pass/warn/fail with concrete fixes — the records that decide whether your agent's email lands.
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Have an AI agent call you
Hear it for yourself: sign up and place a live call from your own agent in minutes. No subscription, pay only for what you use.