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hail.so

Give apps and AI agents a phone number and email inbox. Make or take calls, send or answer texts and email. Open-source or cloud priced on usage.

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Product

ChannelsVoice APISMS APIEmail APIIntegrationsComparePricingNumber pricesTwilio number costAI model pricing

Free tools

DMARC Report AnalyzerAI Voice Agent Prompt BuilderAI Voice Agent Cost CalculatorAnswering Service Cost CalculatorSMS Length & Segment CalculatorEmail Deliverability CheckerAll tools

Resources

DocsEngineering blogLead outreach with an agentMCP10DLC timeline guideDomain warmup guideAgent skill file

Company

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