- Canonical removed/blog/seo-guide · 12 min agoCritical
- Title changed/pricing · 38 min agoReview
- Noindex added3 pages · 1 hour agoCritical
SEO change monitoring
Catch SEO issues before traffic drops
Audit your site, crawl deep, and get alerted when titles, canonicals, robots.txt, sitemap.xml or indexability change.
Explore the workspaceNo registration
- No credit card
- Setup in 30 seconds
- Cancel anytime
Monitoring 24/7
Anonymous sample audit
SEO change overview
- robots.txt modifiedNew disallow rule detectedReview
- sitemap.xml shrank214 URLs removedCritical
- HTTP status stable127 monitored pagesGood
H1 overwritten by a filter
Mobile profile · /category/ensembles
Was Jazz ensembles for bands & orchestras
Now 142 items found
Free technical SEO tools
Focused checks for every technical SEO task. Free to use, no signup required.
Website Crawler
Crawl up to 500 URLs and find technical issues across your site.
Start crawlingCore Web Vitals
Check real-user performance data from Google’s CrUX dataset.
Check Web VitalsPage Audit
Get a prioritized SEO health check for any public page in seconds.
Audit a pagePage Changes
Snapshot a competitor page and see exactly what changes over time.
Monitor changesSchema Validator
Validate JSON-LD and see whether pages qualify for rich results.
Validate schema
Technical SEO change detection
Know what changed before search traffic reacts
A technical SEO audit tells you what is wrong now. 2-UA adds the missing timeline: it saves a baseline, checks the same pages again, and shows the exact difference when an important search signal changes.
That matters because many organic traffic problems start with a small release, CMS edit,
plugin update, or server rule. A canonical disappears. A product template receives
noindex. A mobile filter replaces the H1. A new robots.txt directive blocks a
section, or a sitemap suddenly loses hundreds of URLs. The page can still look normal to a
visitor while its crawlability or indexability has changed.
Use the free tools for one-off research, then turn the pages and files that matter into a repeatable monitoring workflow. You can run a free SEO page audit, crawl up to 500 URLs, or validate robots.txt rules before creating a project.
Choose the right technical SEO check
Start with the scope you need today. Move from a single URL to site-wide discovery or recurring change monitoring without learning a new workflow.
SEO page audit
Inspect a public URL for metadata, headings, canonical tags, robots directives, links, schema, images, rendered HTML and security headers.
- Best for pre-publish checks
- No account required
Technical website crawler
Follow internal links and review site-wide patterns: response codes, duplicate or missing tags, crawl depth, outgoing links and content signals.
- Best for issue discovery
- Mobile or desktop user agent
Continuous SEO monitoring
Compare snapshots of business-critical pages, robots.txt and sitemaps, keep a change history, and route important alerts to Slack or Telegram.
- Best for preventing regressions
- 7-day full-access trial
Find the issue, understand the impact, keep it from returning
Check
Run an instant page audit, a full crawl, or a focused technical validator.
Understand
See the exact title, canonical, directive, or sitemap entry that changed.
Monitor
Keep SEO-critical pages and crawl controls under watch around the clock.
Turn silent website changes into a visible workflow
2-UA gives SEO, agency and engineering teams the same evidence: what changed, where it changed, and when it first appeared.
For in-house SEO teams
Protect category pages, templates and high-value landing pages between scheduled audits. Review indexability, metadata and sitemap changes before diagnosing a traffic drop days later.
Plan useful alertsFor SEO agencies
Keep client sites under consistent technical control, separate urgent regressions from routine edits, and use snapshot history to explain what happened without relying on memory or screenshots.
Explore agency reportingFor developers and product teams
Add a fast post-release safety net for canonical tags, headings, response codes, robots rules and rendered output. Share the actual before-and-after diff instead of a vague SEO bug report.
Run a release checkQuestions teams ask before putting a site under watch
Need to test the output first? The page audit, crawler, robots.txt tester and other focused tools are available without registration.
Explore free SEO toolsWhat is technical SEO monitoring?
Technical SEO monitoring repeatedly checks the signals that affect how a page can be crawled, understood and indexed. Unlike a one-time audit, it compares the latest result with a saved baseline so you can see when a title, canonical, robots directive, status code or other important element changed.
What page changes can 2-UA detect?
2-UA can track page titles, meta descriptions, headings, canonical URLs, meta robots, response codes, redirects, response headers and selected HTML content. Mobile and desktop profiles help reveal output that changes by user agent or rendering path.
Can I monitor robots.txt and sitemap.xml?
Yes. Monitoring can surface changed robots.txt directives and sitemap differences, including meaningful changes in the number of listed URLs. The free robots.txt validator is useful for checking syntax and allow or disallow behavior before you start recurring monitoring.
How is continuous monitoring different from a website crawl?
A website crawl discovers patterns and technical problems across many linked URLs at a point in time. Continuous monitoring focuses on selected pages and control files, checks them again on a schedule, and preserves a before-and-after history. Many teams use a crawl to discover what matters and monitoring to protect it.
Where are change alerts delivered?
Important changes can be routed to Slack or Telegram so the people responsible can react without watching another dashboard. The alert identifies the affected URL and gives the old and new value, making it easier to decide whether the change is expected.
Will monitoring improve Google rankings by itself?
No tool can guarantee rankings. 2-UA helps teams find technical regressions and unexpected changes sooner; your team still decides what to fix and how it fits the wider SEO strategy. It complements Search Console and analytics by showing the page-level change that may explain a new crawl, indexation or traffic problem.
Practical technical SEO guides
Browse all articles
Go deeper than the report
Execution-ready workflows for crawling, monitoring, alerting and explaining technical changes.
Crawling · 7 min
How to find broken links (4xx and 5xx) on your website without crashing production
Crawl your site, filter 4xx/5xx, export to XLSX, and set up auto-alerts so broken links never reach users again.
Read guide Crawling · 7 minHow to detect redirect chains and redirect loops that eat your crawl budget
Find every redirect chain longer than one hop, fix loops, and recover crawl budget Googlebot is wasting on 302/301 ping-pong.
Read guide Crawling · 8 minHow to find orphan pages on your website (pages with zero internal links)
Combine a full crawl with your sitemap and GSC export to surface every page Google knows about but your site does not link to.
Read guide Content & Links · 7 minHow to find missing and duplicate title tags across thousands of pages
Crawl, filter empty and duplicate titles, and export a prioritized fix list — including title length checks for SERP truncation.
Read guide
Technical SEO without blind spots