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Open Source

GPL-2.0 License

Both PizzaTier (free) and PizzaTierPro (paid) are released under the GNU General Public License v2.0. Open source, no proprietary lock-in.

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PizzaTier

Free & GPL-2.0

The core plugin is free of charge and GPL-licensed. Download, use, modify, and redistribute freely under the terms of the GPL.

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PizzaTierPro

Paid & GPL-2.0

PizzaTierPro is sold commercially but is also GPL-licensed. A purchase funds development — it does not restrict your GPL rights.

What GPL-2.0 Means for You

The GNU General Public License (GPL) guarantees your freedom to use, study, share, and modify the software. Key rights under GPL-2.0:

  • Freedom to use — Run the plugin for any purpose, on any number of sites.
  • Freedom to study — Inspect and learn from the source code.
  • Freedom to modify — Customize the plugin to suit any project.
  • Freedom to distribute — Share copies of the original or modified code, provided the GPL license is retained.

These freedoms apply to both PizzaTier and PizzaTierPro. Purchasing PizzaTierPro provides access to the code, updates, and support — the GPL rights come with the software regardless.

Copyleft & Distribution

GPL-2.0 is a copyleft license. If a modified or extended version of PizzaTier or PizzaTierPro is distributed, the distribution must also be under GPL-2.0. This ensures derivative works remain open.

Themes, plugins, or code that merely use PizzaTier via its public API, REST endpoints, or shortcodes are not considered derivative works and are not required to be GPL-licensed.

Copyright Notice

PizzaTier and PizzaTierPro are copyright © 2026 Ryan Bishop / Island Sun Design.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation — either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but without any warranty — without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.

Full License Text

The complete text of the GNU General Public License v2.0 is available at:

https://www.gnu.org/licenses/old-licenses/gpl-2.0.html ↗

The license file is also included in the root directory of each plugin as LICENSE or LICENSE.txt.

Trademark Notice

While the code is GPL-licensed, the name "PizzaTier," "PizzaTierPro," and associated logos and branding are trademarks of Island Sun Design. GPL rights do not grant permission to use these trademarks for promoting derivative or competing products. See the Terms of Use for details.

Questions

Licensing questions can be directed to ryan@islandsundesign.com or via the contact page.