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Courier

Courier

Messaging platform for orchestrating notifications and lifecycle journeys across every channel.

softwareAPI Toolsnotificationsapimessaging
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Our Verdict

Best for

Teams that want one API for all notification channels plus AI-agent-triggered messaging.

Skip if

You're only sending a single channel (e.g. just email) and a dedicated single-channel provider would be simpler.

What is Courier?

Courier is a multichannel notification platform that lets developers send email, push, SMS, in-app, and chat messages through a single API and journey builder, rather than integrating separately with each channel provider. It positions itself as "the messaging platform for humans and AI agents," adding an AI Agent node and AI-powered translations to its journeys and broadcast tooling. Note: the product's original domain trycourier.com now permanently redirects to courier.com. The platform includes an inbox component for in-app notifications, user preference management, and observability integrations, with pricing based on message volume rather than seats or channel count. The free Developer tier includes 10,000 sends per month with journeys, broadcasts, an MCP server, a CLI, and SDKs; paid usage is billed per send, and Enterprise adds dedicated support, RBAC, SLAs, and EU data residency.

SpecificationsAI-estimated

deploymentCloud/SaaS
open source❌ No
api available✅ Yes
support optionsEmail support, chat support (Business), dedicated Slack support (Enterprise)
key integrationsSlack, observability tools, SDKs for major languages

Key Features of Courier

Sends email, push, SMS, in-app, and chat messages through a single unified API.
Provides a visual journey builder for multi-step, multichannel lifecycle messaging campaigns.
Includes an AI Agent node in journeys so AI systems can trigger and personalize notifications.
Offers AI-powered translation of message content for multilingual audiences.
Ships a prebuilt inbox UI component for in-app notification centers.
Lets end users manage their own channel and topic preferences through a preference center.
Bills based on message volume rather than per-seat licensing, with a 10,000-send free tier.

Use Cases for Courier

1

Transactional email and SMS

Send receipts, alerts, and confirmations across channels from one API integration.

2

Multi-step lifecycle journeys

Build onboarding or re-engagement sequences that branch across channels based on user behavior.

3

In-app notification center

Embed Courier's inbox component to show users a running feed of in-app alerts.

4

AI agent-triggered messaging

Let an AI agent workflow send personalized notifications via the AI Agent journey node.

Pros & Cons of Courier

Pros

  • Generous free tier of 10,000 sends per month including journeys and broadcasts
  • Per-send pricing scales predictably without per-seat costs
  • Prebuilt inbox and preference-center components reduce custom UI work
  • MCP server and CLI support integration with modern AI-assisted development workflows

Cons

  • Original trycourier.com domain now redirects, which can confuse users following older links or bookmarks
  • Per-send pricing at scale can become expensive compared to flat-rate competitors for very high volume
  • Enterprise features like SLA and RBAC require contacting sales rather than transparent self-serve pricing

Frequently Asked Questions

What happened to trycourier.com?

It now permanently redirects to courier.com, which is the current live domain for the product.

Is there a free plan?

Yes, the Developer plan includes 10,000 sends per month for free.

How does paid pricing work?

The Business tier charges $0.005 per send after the free allotment, with Enterprise offering custom volume pricing.

What channels can Courier send to?

Email, push, SMS, in-app, and chat channels are all supported.

Pricing Overview

View full pricing →
Freemium

Developer

0

Business

0.005 per send

Enterprise

Contact for Pricing

Reviews & Ratings0.0

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Customer.io is a marketing automation platform that lets businesses send personalized messages based on user behavior. It supports email, SMS, and push notifications, enabling real‑time engagement across channels. The service provides a visual workflow builder, robust segmentation, and detailed analytics, helping marketers optimize conversion and retention without writing code.

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Knock is a customer engagement and notifications platform that gives developers a single API and workflow builder for sending messages across email, SMS, push, chat, and in-app channels. Instead of building and maintaining custom notification pipelines, teams define reusable workflows with preferences, batching, and delivery logic, while non-technical teammates can edit content and audiences without redeploying code. Knock pulls in real-time data from data warehouses, CDPs, and webhooks to drive dynamic audience segmentation and personalized content, and it offers AI-assisted workflow creation from natural language prompts. It's used by companies like Vercel, Webflow, and Medium to handle hundreds of millions of messages per month, with SDKs for 8+ languages and compliance support for HIPAA, SOC2, GDPR, and CCPA.

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💻Developers🚀Startups & Founders🏢Enterprise Teams

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About the Product

Unclaimed Listing
Platforms
Web
Target AudienceDevelopers building multichannel transactional and lifecycle notification systems

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