Courier

What is Courier?

Courier is a customer messaging platform for sending product notifications and lifecycle campaigns through a single API. A developer makes one call and Courier routes each message to the right channel and provider, covering email, SMS, push, WhatsApp, Slack, Microsoft Teams and an in-app inbox. Templates are designed once in Design Studio and rendered for every channel, while multi-step Journeys handle triggers, delays, branches, digests and experiments. Courier sits on top of the provider accounts you already hold, such as SendGrid, Amazon SES and Twilio, and can switch to a backup provider when one goes down. For developers there is a REST API, SDKs, a CLI and an MCP server, so AI coding agents can build with it, and product or marketing teams work in a visual dashboard. Pricing follows usage: the Developer plan is free for 10,000 sends a month and the Business plan costs $0.005 per send.

Use cases

• Send transactional notifications
• Automate onboarding email sequences
• Add an in-app notification inbox
• Let users manage notification preferences
• Route messages across email, SMS and push
• Translate notifications with AI
• Give each customer their own branding

Who it's for

• Software developers
• Product teams
• Lifecycle marketers

Why use Courier

• One API replaces separate integrations for each channel and delivery provider.
• Non-engineers can change message wording, design and workflows without waiting for a release.
• Users choose which notifications they receive and on which channel, and Courier enforces those choices.
• You keep your existing providers, sender reputation and provider pricing.
• Pricing is based on sends, not seats or channels, so adding teammates does not raise the bill.

Courier features

• REST API, SDKs and CLI for sending messages
• Design Studio templates rendered for every channel
• Journeys with triggers, delays, branches, digests and experiments
• In-app inbox and toasts for web, iOS, Android, React Native and Flutter
• Preference center that is checked on every send
• Tenants for per-customer branding, preferences and routing
• Failover to a backup provider
• Message logs and analytics for delivery, open and click rates
• Webhooks for delivery, open and click events
• MCP server and agent skills for AI coding agents
• AI Translations and an AI Agent node on the Business plan

Courier integrations

• SendGrid
• Postmark
• Amazon SES
• Twilio
• Firebase Cloud Messaging
• APNs
• Slack
• Microsoft Teams
• WhatsApp
• Claude Code
• Cursor
• Codex

How to get started with Courier

1. Create a free account, generate an API key and connect your email, SMS or push provider accounts.
2. Design a template once in Design Studio so it renders for each channel you use.
3. Send a message with one API call, or build a Journey with triggers, delays and branches.
4. Courier routes each message to the right channel and provider, falling back to a backup when needed.
5. Review logs and analytics for delivery, opens and clicks, and receive events through webhooks.

Courier limitations

• The free Developer plan is limited to 10,000 sends per month
• You connect your own delivery provider accounts; Courier bills separately per send
• AI Translations and the AI Agent node are listed on the Business plan, not the free plan

Courier pricing

Yes, Courier has a free plan. Paid plans start at $0.01 usage-based, according to the official pricing page on 24 Oct 2026.

Courier plans

• Developer

  Free

  up to 10,000 sends per month

  • 10,000 sends per month
  • Journeys and broadcasts
  • MCP server, CLI and SDKs
  • SSO via Google, GitHub and email
  • Email and chat support

• Business

  $0.005 per send

  pay as you go

  • Everything in Developer
  • AI Translations
  • AI Agent node
  • Cross-device email testing
  • EU data residency

• Enterprise

  Custom

  volume pricing

  • Volume pricing
  • Dedicated Slack channel
  • Observability integrations
  • Role-based access control
  • Enterprise SLA

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Courier alternatives

The main Courier alternatives listed on Debuly are Twilio, AgentMail, Zep, AI for Database, Merge and Securiti AI. The table compares pricing and platforms; order is A–Z.

1. 

   AgentMail

   Email API for AI agents: create inboxes by API, hold two-way threaded conversations and react to replies through webhooks.

   Developer platformsAutomation and agents
   FreemiumVisit AgentMail (official site)
2. 

   AI for Database

   Ask your PostgreSQL, MySQL or Google Sheets data questions in plain English and get charts, dashboards and automated alerts.

   Developer platformsProductivityAutomation and agents
   FreemiumVisit AI for Database (official site)
3. 

   Merge

   Unified API and agent tooling that lets software companies ship customer integrations and AI connectors without building each one.

   Developer platformsAutomation and agents
   FreemiumVisit Merge (official site)
4. 

   Securiti AI

   Enterprise DataAI Command Platform for data security posture, AI security and governance, privacy operations and compliance automation.

   Developer platformsAutomation and agents
   Contact salesVisit Securiti AI (official site)
5. 

   Twilio

   Cloud communications platform with APIs for SMS, voice, WhatsApp, email and verification, plus voice AI and conversation memory.

   Developer platformsAutomation and agentsAudio and voice
   Free trialVisit Twilio (official site)
6. 

   Zep

   Managed memory and context platform for AI agents, built on the Graphiti knowledge graph, with Python, TypeScript and Go SDKs.

   Developer platformsAutomation and agents
   FreemiumVisit Zep (official site)

Courier FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from framerusercontent.com · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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