Hail.so: Open-Source Agent Communication Platform
redouanea · reddit · 2026-07-19
Hail.so is an open-source phone, SMS, and email platform designed for AI agents and humans, aiming to unify integrations like Twilio, email services, SMS compliance, retries, webhooks, and model access.
Recent updates include:
- Agents can send emails/SMS during phone calls to provide call summaries or supplementary confirmations
- Supports BYO provider, allowing custom STT/LLM/TTS models for tailored voice or minor language support
- Added agent self-signup skill file
- SMS coverage expanded to 64 new countries for sending/receiving, with automated STOP/HELP/START compliance logic
- Email supports custom domains, delivery tracking, and reusable attachments
- Pricing database expanded to 145 LLM/STT/TTS models
The author created this project after being bogged down by integration and compliance hurdles while trying to enable agents to make real calls, send texts, and write emails for industrial and logistics use cases. It can be self-hosted or used via free registration.
Related event: Open-Source Agent Comms Platform Hail.so Updated(2 posts)→
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