Build product notifications that actually reach people

12 Best Customer Journey Orchestration Tools in 2026

API-first orchestration, enterprise CEPs, and marketing suites compared

Customer Journey Orchestration: A Developer's Guide

How API-first orchestration coordinates triggers, multichannel sends, branching, and retries across the customer journey

Developers Guide to Building A Great User Notification System

Everything you need to know to build a great user notification experience for your application

Email Push Notifications - The Ultimate Guide

Learn how email notifications work, when to use them, and how to set them up using Courier and SendGrid for transactional and event-based messaging.

How To Implement a Facebook-Like Web Notification System

Multi-Channel Communication Platform: A Technical Guide

Notification Infrastructure vs Marketing Platform: When You Need Each

Two different layers of the messaging stack, two different buyers, and why most companies eventually run both.

Top 9 Transactional SMS Service Providers

This article explains transactional SMS and compares transactional SMS service providers in terms of pricing, SDK language support, supported countries, etc.

Transactional vs Marketing Email: A Developer's Guide to Deliverability, Consent, and Infrastructure

What separates transactional from marketing email, and why it shapes everything from sender reputation to which API you should reach for.

Transactional vs. Marketing Notifications: Email, Push Notifications, and SMS

Ultimate Guide to SMS Push Notifications

Learn the differences between SMS and app push notifications, when to use each, and how to send SMS like a pro using Courier and Twilio integration.

Compare Courier

vs. other platforms

Comparing Courier vs Knock: Analysis of Notification Systems

Comparing Courier vs Novu: Analysis of Notification Systems

Courier + Sendgrid: Features, Differences, and Takeaways

Discover how combining Courier with SendGrid enhances email capabilities with powerful templates, automation, user preferences, routing, and cross-channel analytics.

Courier vs Customer.io for Customer Engagement

Compare Courier and Customer.io for product-triggered customer engagement, AI-native journeys, provider control, native inbox, and multichannel templates.

Courier vs Twilio: Why the Best Setup Uses Both

Courier orchestrates the full Twilio messaging stack: SMS, email, Segment, and WhatsApp

MessageBird Alternatives: The Best Platforms to Replace Bird in 2026

The Twilio-Approved Alternative to Twilio Notify

Courier replaces Twilio Notify, offering everything a developer needs to deliver transactional product notifications across every channel

Twilio Notifications - Batching, Scheduling, Digests, and more

Unlock Powerful Customer Engagement: Courier and Twilio Segment Integrations

What Is Twilio Used For? 5 Key Developer Use Cases

A Developer’s Guide to Twilio: 5 Powerful Use Cases and How Courier Enhances the Experience

Add Push to Your App

Frameworks & mobile

Android v/s iOS Push Notifications - What Developers Need To Know

How-To Implement Notifications in Your Gatsby-Powered Website

Learn how to integrate real-time push notifications in your Gatsby site using Courier’s Toast and Inbox components.

How-To Implement Notifications in Your React-Powered Website

Learn how to build real-time push notifications in a React app using Courier’s in-app inbox and toast components.

Implement Push Notifications For Cordova Apps [Top 3 Ways]

Implementing Android Push Notifications [Top 3 Ways]

Learn how to integrate push notifications in Android apps using Firebase, Expo, and Courier—supporting Kotlin, Flutter, and React Native frameworks.

Implementing Expo Push Notifications [Step-by-Step Guide]

Learn how to implement and manage push notifications in your Expo apps using Courier—streamline delivery, simplify setup, and support multichannel alerts.

Implementing Flutter Push Notifications [Top 3 Ways]

Implementing Ionic Framework Push Notifications [Top 3 Ways]

Explore three powerful methods for integrating push notifications into your Ionic app using Firebase Cloud Messaging, OneSignal, and WonderPush—complete with pros, cons, and step-by-step guides.

Implementing iOS Push Notifications [Top 3 Ways]

Learn how to implement push notifications in Swift, Flutter, and React Native using APNs and Firebase, and streamline delivery with multichannel support via Courier.

Implementing React Native Notifications [Top 3 Ways]

Explore multiple tools and methods to implement reliable push notifications in your React Native apps using Firebase, OneSignal, and Courier.

Push Notifications in Vue: Comparing FCM, OneSignal, and WonderPush

A comprehensive guide to integrating push notifications into your Vue app using Firebase, OneSignal, and WonderPush—with pros, cons, and setup tutorials.

Notifications for Platforms

CMS & e-commerce

How-To Set Up Multi-Channel WordPress Notifications

Learn how to implement multi-channel notifications in WordPress using Courier—including email, SMS, WhatsApp, and browser push alerts—with step-by-step setup and PHP code examples.

Implementing Hubspot Browser Push Notifications [Top 2 Ways]

Implementing Squarespace Push Notifications [Top 3 Ways]

Set Up WooCommerce Notifications [Top Plugins + Setup Guide]

Send Email by Language

SMTP & APIs

2 Ways to Send Emails with Swift [Step-by-Step Tutorial]

How to Send Emails in Swift Using MessageUI Framework and MailSlurp

3 Different Ways to Send Emails Using Golang

A Complete Guide to Sending Emails with Go Using SMTP, Third-Party APIs, and Multi-Channel Tools like Courier

3 Ways to Send Emails with Rust [Step-by-Step Tutorial]

Learn how to send emails in Rust using SMTP, Lettre, and Amazon SES with step-by-step guides, pros, and cons for each method.

4 Different Ways to Send Emails with C#

5 Different Ways To Send an Email with PHP

Explore five powerful ways to send emails using PHP—from native mail() to multi-channel solutions like Courier.

How to Send Email in Java: JavaMail, Simple Java Mail, and Courier API Compared

Send SMS by Language

Text messaging

2 Ways To Send Text Messages (SMS) with Rust [How-to Guide]

3 Ways To Send Text Messages (SMS) with C#

3 Ways To Send Text Messages (SMS) with Golang

3 Ways To Send Text Messages (SMS) with Java

How to Send SMS in Java: Twilio, MessageBird & Courier Compared

3 Ways To Send Text Messages (SMS) with Ruby [How-to Guide]

4 Different Ways To Send Text Messages (SMS) with Node.js

4 Different Ways To Send Text Messages (SMS) with Python

Learn how to send SMS using Python with Twilio, Vonage, Plivo, and Courier. This guide covers setup, code examples, pros and cons of each method, and helps you choose the best SMS API provider for your application needs.

How to Send SMS in PHP: SMTP, SMS APIs, and Notifications APIs Compared

How to Send SMS in PHP: SMTP vs SMS APIs vs Notification APIs Compared

Sending SMS Verification Using Node.js [How-To Guide]

Send Push by Language

Mobile & web push

Send Push by Language

How-To Send Mobile & Web Push Notifications using Python

Send Push by Language

How-To Send Mobile & Web Push Notifications with Nodejs

Simplify push notification delivery across mobile, web, and third-party platforms using Node.js and Courier’s unified API.

Email Deliverability

SPF, DKIM, DMARC & more

Top 10 Tools to Check Your Email IP & Domain Reputation | Free & Paid

10 Tips To Improve Your Email Sender Domain Reputation Score

DMARC vs SPF vs DKIM - The Ultimate Comparison

GDPR and SMS Marketing - What You Need to Know

IMAP vs POP3 vs SMTP - The Ultimate Comparison

Multiple SPF Records - Everything You Need to Know

Top 10 Email Testing Tools Compared

What is DMARC - The Ultimate Beginner's Guide

What is SMTP - The Ultimate Beginner's Guide

Testing & QA

Test cases

Testing & QA

5 Must-Have Test Cases for Chrome Browser Notifications

Testing & QA

5 Must-Have Test Cases for Mobile App Push Notification

Ensure reliable push notification delivery with these 5 must-have Android test cases—covering states, deep links, localization, haptics, and logged-out users.

Testing & QA

6 'Must-Have' Test Cases for Email Notification

A practical guide to testing critical email notifications that impact user experience, retention, and business success.

More Guides

Everything else

More Guides

What Is Notification Infrastructure?

The software layer that turns product events into messages across every channel.