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In 2025, developers building cross-platform mobile apps face three main contenders: ByteDance's Lynx, Meta's React Native, and Google's Flutter. Each framework offers a different approach to the same challenge: how to build high-quality apps that work across platforms while keeping development efficient.

Building a great SaaS product isn’t just about features—it’s about keeping users engaged. You might spend months developing an amazing tool, but if users sign up, explore a few features, and then disappear, all that effort is wasted. Often, it’s not that they dislike your product; they simply forget about it or never realize its full value. That’s where multichannel notifications come in.

Good observability helps you understand what’s happening, but our previous logs made it hard to see the full picture. Debugging often meant searching, filtering, and manually piecing together trends. Spotting a spike in failures or a drop in message volume shouldn’t take that much effort. The new logs histogram makes this easier. Instead of scanning rows of data, you get a real-time visual overview of message activity.

Amazon Simple Email Service (Amazon SES) is widely used for sending emails at scale, but traditional authentication with IAM User credentials can be risky and cumbersome. Now, Courier supports IAM Role authentication for Amazon SES, offering a new, more secure way to authenticate without long-lived access keys. This method reduces the risk of credential leakage and simplifies credential management by using temporary, automatically rotated credentials.

Notifications are the lifeblood of modern apps. They re-engage users, keep them informed, and build trust. But most apps rely solely on push notifications—without an in-app inbox, critical updates can easily be lost. Push notifications grab attention in the moment—perfect for a flight delay, an account alert, or a message from a teammate. But they’re fleeting—once dismissed, they’re gone.

I've been making apps since just after the App Store launched - it's actually what made me want to make apps in the first place. Looking back over this journey, it's amazing to see how much has changed. Let me take you through this evolution, because what's happening right now in mobile development is absolutely incredible.

Twilio powers communication for over 10 million developers and 300,000 businesses worldwide. As a leader in customer engagement, they’ve set the standard for seamless, scalable developer tools. But as their business grew, managing notifications became a challenge. Fragmented tools and workflows created inconsistencies and inefficiencies across teams. To solve this, Twilio turned to Courier—a platform designed to unify notifications and improve the developer experience at scale.

This month, we’re rolling out updates to our mobile SDKs with a focus on usability, reliability, and developer experience. Here’s a breakdown of the latest improvements for iOS, Android, React Native, and Flutter.

Sending a notification is simple—sending it at the right time is not. Whether it’s avoiding off-hours pings or managing users across time zones, timing matters. With Courier’s new Delivery Window, you can deliver messages at the perfect moment—without the overhead of custom scheduling code. Set the Rules, We’ll Handle the Rest The Delivery Window feature lets you define when notifications should go out, and Courier ensures they follow your rules.

Push notifications have carved their own niche as a powerful tool for continuous user engagement. Regardless of whether an app is actively in use, they deliver your messages straight to your user's device. Two useful tools to enhance your push notification strategy are Segment and Courier. In this article, we show you how to set up Courier to listen to your Segment events and then send push notifications to an Android device based on data from these events.