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Plugin Update Message Customizer changes the default “There is a new version of PLUGIN available.” message on WordPress’ Plugin listing page.
This is useful for multiple scenarios: 
* If using WordPress within a dev/staging/live production environment, this plugin is great to install on the live and staging servers so that end users won’t update a plugin and therefore break the tracked remote branch. 
* On sites where you only want specific users to update the plugins, this will prevent users from clicking “update now.” 
* If you want to add additional options (e.g., “View version X.Y.Z details, update now, or mark as in testing.”) to the plugin new version message, e.g., “mark as in testing” to let others know the plugin is currently being tested and they should not yet update it on production.
Of course, other plugins and functions would prevent all plugin notifications. However, for the average user who logs into their live/production site instead of local/dev, this would still allow them to see that updates EXIST, however will just prevent them from performing them in an environment they should not be updated in.
Upcoming features: 
* Backwards compatibility (to be tested starting with WordPress 4.5) 
* Ability to hide the number of plugins with updates next to “Plugins” in admin sidebar) 
* Ability to hide all update notifications 
* Ability to prevent all automatic updates 
* Action on plugins with update message to apply the label “In testing,” which lets other users know that the plugin’s update is currently being tested in dev 
* Functionality to hide the plugin in the Plugins listing page

Notification Customizer

Plugin Update Message Customizer changes the default "There is a new version of PLUGIN available." message on Wordpress' Plugin listing …

Helmut Wandl

Peak Publisher turns your WordPress site into your own plugin update server. It’s built for agencies, product teams, and developers who want to create and ship their own custom plugins and want full control over distribution, versioning, and updates — without relying on third‑party services.
With a modern, task‑focused admin UI, you can add new plugins and releases via drag & drop, validate packages automatically, and publish or draft releases with one click. Your client plugins point to your Peak Publisher site via a standard <code>Update URI</code>, so WordPress will discover and install updates directly from you.
With this solution, you can have your own self-hosted plugin update server in just 5 minutes, allowing you to centrally manage your plugins and deploy updates with incredible ease.
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<h3>❇️ COMING SOON ❇️</h3>
Managing and Updating wp.org Plugins
In just a few weeks, Peak Publisher will let you manage plugins hosted on wordpress.org the same way you already manage self-hosted ones. Drag and drop your plugin folder onto Peak Publisher, and everything else is handled automatically — no more SVN.
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<h3>KEY FEATURES</h3>
🚀 Clean admin UI with a guided “Add New Plugin” flow 
A short and focused user interface guides you through the entire process to deploy your first plugin with amazing ease within minutes.
☝️ Drag & drop a ZIP or simply the whole plugin folder 
You can drop a ZIP file, but the easiest way is to simply drop the entire raw plugin folder or the folder’s contents. The ZIP file will then be created automatically for you.
✅ Automatic validation: headers, version, Update URI 
Peak Publisher automatically checks each new release for required headers, proper semantic versioning, consistent update URIs, and more to ensure everything is correct.
🧽🫧 Auto‑cleanup of workspace artifacts (e.g. .git, node_modules) 
To provide clean packages and reduce package size, Peak Publisher automatically removes development files and operating system artifacts from your uploads using patterns that you can configure. (optional)
🔐 Optional restriction via IP/domain whitelist 
Packages are stored in a private, server-protected directory with no direct web access. By default, access via the API is still possible from anywhere. Using IP or domain whitelisting, you can restrict access to update metadata and downloads.
<h4>Some More Features</h4>
📈 Analytics: You can always see how many active installations there are. 
📄 Readme.txt: Provide your users with a description, changelog, tested up to and more.
<h3>HOW IT WORKS</h3>
<ol>
<li>Install Peak Publisher 
on a dedicated WordPress site (recommended) 
or any site you control.</li>
<li>Follow the “Add New Plugin” flow 
add the <code>Update URI</code> header and the bootstrap code to your plugin.</li>
<li>Upload your plugin 
drag & drop the zipped plugin or the plugin folder.</li>
<li>Peak Publisher validates your upload 
and shows you the validation result.</li>
<li>Click “Add new plugin” 
to finish the process.</li>
<li>Drop your next release with increased version number 
once you have one ready.</li>
</ol>
<h3>WHO IS IT FOR?</h3>
<ul>
<li>Agencies that deliver custom plugins to multiple clients</li>
<li>Product teams with private/proprietary extensions</li>
<li>Creative plugin developers who want to deploy updates quickly and easily</li>
</ul>
<h3>Privacy</h3>
Peak Publisher does not collect personal data, does not track usage, and does not use third‑party services. All files are stored on your server in a protected directory.

Peak Publisher

Self‑host your plugin repository. Manage releases, serve updates, and streamline your workflow — all inside WordPress.

Notification Customizer vs Peak Publisher