Description

The Regression Testing addon captures HTML snapshots of MainWP child sites and compares each new scan with the previous one, calculating the percentage of change and displaying side-by-side diffs between removed and added code. The extension schedules automatic scans after each plugin, theme, or WordPress core update and sends email alerts when the variation exceeds the configured threshold, making it possible to identify visual breaks or suspicious injections before they affect visitors.

Key Features

  • Raw HTML diff
    Compares the source code from the current scan with the previous one, marking removals and additions in separate columns.
  • Rendered visual comparison
    Generates a before-and-after preview of the page with JavaScript disabled and external scripts blocked for security.
  • Enqueued file tracking
    Detects CSS and JavaScript inclusions and removals loaded by WordPress between two scans.
  • Scheduling and post-update trigger
    Runs at daily, weekly, biweekly, or monthly intervals and also after each applied update, with a configurable delay for cache/CDN settling.
  • Controlled batch processing
    Scans three sites in parallel, up to three pages per site, with 5-second intervals between batches to avoid overloading the server.

Benefits of Regression Testing Extension

  • Fast post-update validation
    Confirms whether plugin, theme, or core updates broke anything visually on the front end before the user reports it.
  • Early injection and tampering detection
    Flags unexpected changes in the served HTML, helping detect malware or unauthorized modifications.
  • Centralized auditing in the MainWP dashboard
    Consolidates history, percentages, and alerts for the entire network of child sites into a single dashboard with dedicated widgets.
  • Configurable snapshot history
    Keeps previews for periods from 1 day to 1 year or indefinitely, according to the agency’s retention policy.

Who Is It For?

  • Agencies and freelancers who manage dozens or hundreds of WordPress sites through MainWP.
  • Maintenance teams that apply bulk updates and need to validate the visual impact on each child site.
  • Security professionals who monitor suspicious changes in the HTML served by managed sites.

Within the MainWP ecosystem, this component fills the gap between running bulk updates and being sure that nothing broke on the front end of managed sites. The combination of code diffs, visual comparison, and percentage-of-change alerts transforms the post-update risk window into a controlled workflow, with recorded evidence of every change detected on child sites.

Frequently asked questions

Is MainWP Regression Testing Extension GPL-licensed?

Yes. MainWP Regression Testing Extension is distributed under the GPL (GNU General Public License). You may legally use, modify and redistribute it on as many sites as you want.

Can I use MainWP Regression Testing Extension on multiple sites?

Yes. You can use MainWP Regression Testing Extension on multiple sites. The number of sites connected to Ultrapack Auto Updater is limited by your plan.

How much does MainWP Regression Testing Extension cost at Ultrapack?

MainWP Regression Testing Extension costs US$2.99 as a single purchase, and it is also included in the subscription plans starting at US$12/mo (VIP I).

Does MainWP Regression Testing Extension include updates?

Yes. The current version of MainWP Regression Testing Extension is 5.2.1, published at Ultrapack on Jul 23, 2026. Subscribers update straight from the WordPress dashboard with UAU (Ultrapack Auto Updater).

Is MainWP Regression Testing Extension scanned before publication?

Yes. Every version of MainWP Regression Testing Extension goes through a malware scan (ClamAV and YARA rules, at UltraHub) before it is published.