A detailed comparison of Spix and Vapi for building AI-powered voice agents, covering pricing, channels, developer experience, and more.
Read article →Blog
Dispatches from the edge of agent communication.
Product thinking, operational notes, and channel design lessons from building a system that lets agents call, text, and email humans in the real world.
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Start with product philosophy, then move into voice runtime quality and the operational realities behind agent communication.
Comparison
Spix vs Vapi
A detailed comparison of Spix and Vapi for building AI-powered voice agents, covering pricing, channels, developer experience, and more.
Open post →Comparison
Spix vs Retell AI
A detailed comparison of Spix and Retell AI for developers building AI-powered voice agents. CLI-first workflows vs. dashboard-driven development.
Open post →Comparison
Spix vs AgentMail
A fair comparison of Spix and AgentMail for AI agent communications. AgentMail excels at email. Spix covers voice, SMS, and email in one platform.
Open post →Tutorial
Add Email Follow-Ups to Your AI Call Agent
Part 4 of 4 — When calls go to voicemail, your agent sends a personal email follow-up automatically.
Open post →Tutorial
Give Your AI Agent a Phone Number in 60 Seconds
A practical walkthrough for going from zero to a working outbound call with Spix, using the current CLI command set instead of a stack of carrier and media vendors.
Open post →Tutorial
Add Scheduling and Triggers to Your AI Call Agent
Part 3 of 4 — Wire up event-driven triggers so new leads get called automatically within 60 seconds.
Open post →Tutorial
Connect Your AI Call Agent to a CRM
Part 2 of 4 — Pull lead data before each call, personalize briefings, and write outcomes back to your CRM automatically.
Open post →Essay
Agents That Can’t Communicate Are Agents That Can’t Close
The reasoning layer of the agent stack is solved. The delivery layer — where agents actually reach humans by phone, email, and SMS — is where production systems still break. This is the last-mile problem, and it is the only one that matters for revenue.
Open post →Tutorial
Give Your AI Agent a Phone Number
Part 1 of 4 — Build a Sales Agent That Makes Real Phone Calls. Set up Spix, rent a number, and make your first AI-powered outbound call.
Open post →Comparison
Spix vs Bland.ai
Bland.ai is a managed AI phone call service. Spix is communications infrastructure your agent controls. Here's how they differ.
Open post →Architecture
The Agent Communications Stack: Voice, SMS, and Email Unified
A real agent communications stack is not just three channels under one brand. It is a single operational model with deterministic routing, playbooks, operator review, and shared observability.
Open post →Comparison
Spix vs Twilio for AI Agents
Twilio was built for developers building apps. Spix was built for developers building agents. Here's how they compare.
Open post →Guide
MCP Phone Calls: Give Claude a Real Phone Number with Spix
Give Claude a real phone number with Spix MCP. Two commands, 43 tools, and your AI agent can make real phone calls, send email, and manage contacts.
Open post →Guide
5 AI Agent Use Cases That Need a Real Phone Number
Five production use cases where giving your AI agent a real phone number transforms results — with concrete scenarios, playbook configs, and ROI framing for each.
Open post →Guide
Programmatic Voice Calls in 2026: What's Changed and How to Do It Right
Programmatic voice calls have evolved from IVR trees to real AI conversations. Here's what's changed and how to build with modern tools.
Open post →Guide
How to Give Your AI Agent the Ability to Make Phone Calls
A practical guide to giving AI agents real phone call capabilities — from infrastructure options to working code with Spix.
Open post →Keep moving
Use the docs when you want commands. Use the blog when you want judgment.
The docs explain how to operate Spix. The blog explains why the platform is shaped the way it is.