The code is open source
The Mailzo Mac app is free and open source. Its code is published under the GNU Affero General Public License v3.0 (AGPL-3.0).
That means you can:
- Use the app for any purpose, for free
- Read the code to check what it does
- Change it
- Share it, with or without your changes
If you share a changed version, or run a changed version as a service for other people, the AGPL asks you to share your changed source code under the same licence. The full licence is in the LICENSE file in the source code.
Copyright © 2026 Grayic LLC.
The name and logo are ours
The open source licence covers the code, not the Mailzo name, logo or app icon. They belong to Grayic LLC.
You're welcome to:
- Say your project is "based on Mailzo" or "a fork of Mailzo"
- Use the name to talk about Mailzo, for example in a review, article or tutorial
Please don't:
- Call your own version "Mailzo", or use a name or logo that could be mistaken for it
- Use the Mailzo logo or icon in your own app
- Suggest that Grayic made, supports or approves your version when it doesn't
If you share a changed version, please give it a different name and icon.
For permission questions, email hello@getmailzo.com.
Third-party software
Mailzo is built with many open source libraries. Their licences and notices come with the source code and the app.
