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>log in to commentHail lets AI assistants make and receive calls, send SMS, and handle email through one API, with phone numbers in 120+ countries. I built it to give assistants real‑world communication channels for apps and agents. Let me know what works for you or what’s missing 🙏
Hail provides a single API for AI assistants to make/receive calls, send/receive SMS, and send/receive email.
- for
- Developers building AI agents or apps that need voice, SMS, and email communication.
- pricing
- freemium
- license
- AGPL-3.0
- v0.29.0hail CLI v0.29.014 hours ago
- v0.28.0hail CLI v0.28.02 days ago
- v0.27.0hail CLI v0.27.07 days ago
Key features
- Voice calls — Make and receive phone calls with selectable or custom voices, plus transcript and optional recording.
- SMS messaging — Send and receive SMS worldwide, with per-message pricing and support for inbound replies.
- Email handling — Send and receive email, use a Hail domain or your own without extra fees, and track opens.
- Global phone numbers — Rent phone numbers in 120+ countries, priced at carrier cost only.
- Single API key — One API key powers calls, SMS, and email via REST, CLI, or Python SDK.
- Open-source/self-hosted option — Source code available on GitHub for self-hosting if preferred.
Use cases
- Customer support agents that can call, text, and email users from a single inbox.
- AI-driven sales bots that schedule appointments via voice calls and follow up with SMS.
- Automated notification systems that send alerts by phone, text, or email based on events.
- Developers adding voice, SMS, and email channels to existing applications with one SDK.
Hail pricing
- Pay-as-you-go$0.10 per minute of voiceIncludes connection, voice, transcription, and model · $0.018 per US SMS · $1 per 1,000 emails · Phone numbers rented at carrier cost only
- Additional rates$0.01 per recorded minuteRecording kept 30 days by default · Turn off recording to save $0.01/min
Hail vs alternatives
 Hail |  Vonage |  Insomnia |  n8n | ||
|---|---|---|---|---|---|
| Best for | Unified communications API for AI assistants | Multi-channel communication API | Email-only API | API testing and debugging | Low-code workflow automation |
| Pricing | Freemium | Subscription | Subscription | Free | Subscription |
| DevHunt upvotes | 1 | 0 | 0 | 0 | 0 |
| Launched | Sep 2031 | — | — | — | — |
- Hail vs Vonage: Vonage offers separate APIs for SMS, voice, and email, while Hail combines all three in one API.
- Hail vs Resend: Resend focuses only on email delivery, whereas Hail adds voice and SMS capabilities.
- Hail vs Insomnia: Insomnia is an API client for testing, not a communications service like Hail.
- Hail vs n8n: n8n provides workflow automation across many services, while Hail provides the underlying voice/SMS/email primitives.
Hail FAQ
Is there a subscription?+
No. Hail is prepaid; you add credit and pay only for usage, with a monthly fee only for rented numbers.
What does the $0.10 per minute include?+
It covers the phone connection, voice synthesis, transcription, and the language model in a single charge.
How are SMS messages billed?+
A US SMS costs $0.018, Canada $0.035, and other countries $0.20; each 160-character segment is billed separately.
Can I use my own email domain?+
Yes, you can connect your own domain without an add-on fee; each workspace also gets a default @mail.hail.so address.
Is there a self-hosted version?+
Yes, the source code is available on GitHub for those who prefer to self-host the service.
Summarized by DevHunt from hail.so · Oct 20, 2026. Details may change; check the official site.
