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Adding Custom Apps to Mailbird Next

  1. Mailbird Next for Mac & Windows
  2. Mailbird Next Features
  3. Core Features
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Oliver Jackson
  • April 18, 2026 09:54
  • Updated

➕ Add Any App to Mailbird Next

You can now add any app you like to Mailbird Next quickly and easily. This amazing feature helps you make the most of your favorite app, all without ever leaving Mailbird Next's interface.

🧩 Why Add Custom Apps to Mailbird Next

By integrating your favorite apps directly into Mailbird Next, you can:

  • Boost your productivity by keeping everything in one place.

  • Switch between apps without opening a new tab or window.

  • Customize Mailbird Next to perfectly fit your workflow.

🚀 How to Add a Custom App

Follow these simple steps to add a custom app to Mailbird Next:

  • Click the Apps icon in the bottom-left corner of the Mailbird window (as shown below).

  • In the Apps window, click on Custom Apps at the top of the page.

  • Enter the name and URL of the app you'd like to add.

  • Select how you would like to view the app (i.e. Fullscreen, Sidebar, both).

  • Click Add, so that your custom app's icon will appear in your sidebar.

💡 Note: You can add Custom CSS code to further customize the appearance and layout of your custom app. If you're not familiar with how this works, you can disregard this field and leave it blank.

✅ All Set!

That’s it! Your custom app is now ready to be used in Mailbird Next. 🥳

💬 Need More Help?

If you're still unsure about how to add custom apps to Mailbird Next, or you would like further assistance before starting to do so, then feel free to contact our Customer Happiness Team. We’ll always be happy to provide additional guidance.

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