monitorcat

Monitor.Cat is a lightweight WordPress toolkit that helps you understand and improve your site’s SEO, performance, and system health — all from one beautiful dashboard.
No external services required. Everything runs locally on your WordPress installation. No accounts to create, no API keys to configure, no data leaves your site.
<h4>SEO Analysis</h4>
Scan any post or page for SEO issues with 10 built-in analyzers:
<ul>
<li>Meta tags — Title and description length, presence, and uniqueness</li>
<li>Open Graph — OG and Twitter Card tag verification</li>
<li>Heading hierarchy — H1-H6 structure validation</li>
<li>Image alt text — Coverage analysis across all images</li>
<li>Schema.org — Structured data detection</li>
<li>Links — Internal and external link analysis</li>
<li>XML Sitemap — Sitemap availability check</li>
<li>Robots.txt — Search engine visibility verification</li>
<li>Canonical URLs — Duplicate content prevention</li>
<li>Readability — Content readability scoring</li>
</ul>
<h4>Speed Optimization</h4>
Analyze and improve your site’s loading performance:
<ul>
<li>Page weight — HTML size and resource analysis</li>
<li>Image optimization — WebP availability and lazy loading check</li>
<li>Asset audit — CSS/JS file count and render-blocking detection</li>
<li>Database cleanup — Remove revisions, auto-drafts, spam, and expired transients</li>
<li>Caching — Object cache, page cache, and browser cache detection</li>
<li>Compression — GZIP/Brotli compression verification</li>
<li>Response time — Server TTFB measurement</li>
</ul>
<h4>System Diagnostics</h4>
Comprehensive environment information at a glance:
<ul>
<li>PHP version, extensions, and configuration</li>
<li>WordPress version, debug settings, and constants</li>
<li>Database server info and table statistics</li>
<li>Web server, disk space, and SSL status</li>
<li>Active plugins and theme details</li>
<li>Health checks: cron, REST API, permalinks, file permissions</li>
</ul>
<h4>Coming Soon</h4>
Additional modules are in development:
<ul>
<li>Security — Login protection and hardening</li>
<li>Backup — Scheduled database and file backups</li>
<li>SMTP — Mail configuration and testing</li>
<li>Redirect Manager — URL redirect management</li>
<li>Scanner — Malware and integrity scanning</li>
</ul>

Monitor.Cat

SEO analysis, speed optimization, and diagnostics toolkit for WordPress. All-in-one site health from one dashboard.

jack

Espresso Diagnostics extracs data on your WordPress installation, installed themes, installed plugins (active and inactive), webserver information, PHP version and DB information. 
You can use the main plugin page (accessed from Tools > WP Diagnostics) to reference this information. 
You can use the download buttons to create an archive containing all information in json or csv formats 
You may also choose to use the “Generate text version top copy and paste” button to copoy and paste
The data extracted is quite sensitive and contains information that may be used to check the vulnerability of your WordPress site. Be wary of you share this data with.

Espresso Diagnostics

Plugin that extracts data on WP installation, installed themes, installed plugins and server info for diagnostic purposes. Export data in csv and json

Monitor.Cat vs Espresso Diagnostics