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AODN Changelog Logger keeps a complete audit trail of every update on your WordPress site — plugins, themes, and WordPress core. Know exactly what changed, when it changed, who changed it, and whether it was manual or an automatic update.
Perfect for: 
* Freelancers & agencies managing client sites — send monthly update reports in seconds. 
* Site owners who want to know why something broke after an update. 
* Developers maintaining strict version control and documentation. 
* Anyone running WP auto-updates who wants visibility into what’s happening.
<h4>Features</h4>
<ul>
<li>Automatic logging — hooks into WordPress update events, nothing to configure</li>
<li>Tracks all update types — plugins, themes, and WordPress core</li>
<li>Version history — shows what version something was updated from and to</li>
<li>User attribution — know who triggered each update (or if it was auto-update)</li>
<li>Auto vs. Manual — distinguishes between manual updates and WordPress automatic background updates</li>
<li>Filter & search — filter by type, date range, or search by plugin/theme name</li>
<li>CSV export — export your log for client reports or record-keeping</li>
<li>Auto-purge — optionally auto-delete logs older than X days to keep the database clean</li>
<li>Lightweight — no external dependencies, no bloat, no tracking, no upsells</li>
</ul>
<h4>Usage</h4>
After activation, go to Changelog Logger in your WordPress admin menu. Updates will be logged automatically from that point forward. Use the filter bar to search or narrow down the log. Export as CSV anytime.

AODN Changelog Logger

Automatically logs every WordPress core, plugin, and theme update with version history, timestamps, and user attribution.

Poly Plugins

About 
Update Logger makes keeping track of WordPress updates easy. For those developers that use version control for their code base, this will allow you to ignore 3rd party plugins while still keeping logs of plugins that were updated to make debugging easier. Clean up your repository and make deployment faster with less overhead. Update Logger implements <a href="https://wordpress.org/plugins/loginator/" rel="ugc">Loginator</a> which helps make setup fast and secure, along with the added benefit of having an easy function to assist you with debugging. Simply use the loginator() function or one of it’s static methods.
Features:
<ul>
<li>Log plugin updates</li>
<li>Uses Loginator to easily log essential information for debugging.</li>
</ul>

Update Logger

Log WordPress updates, so you can exclude 3rd party plugins from your repo.

AODN Changelog Logger vs Update Logger