- Canonical removed/blog/seo-guide · 12 min agoCritical
- Title changed/pricing · 38 min agoReview
- Noindex added3 pages · 1 hour agoCritical
SEO release and monitoring intelligence
See what changed, what threatens search traffic, and what to fix first
For SEO, agency, and product teams: enter a URL to audit a page, crawl a site, or create a monitored project with evidence you can revisit.
Explore the workspaceNo registration
- No credit card
- 7-day monitoring trial
- Desktop and mobile evidence
Product previewSee a real SEO change diff Open preview
Scheduled monitoring
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
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 evidence you need
Start with one URL, investigate site-wide patterns, or preserve a baseline for recurring change review.
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 trial of monitoring essentials
Turn observed evidence into the next action
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
Recheck selected pages and crawl controls on a schedule, then review meaningful differences.
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 check
SEO Release Guard
Protect the next release with a before-and-after check
Connect a supported publishing workflow, select representative pages, save a baseline, and run the same checks after a release.
Release Guard keeps the observed old and new values together with the run, URL, and device profile. Your team can decide whether a canonical, robots directive, heading, status, or sitemap change is expected before accepting the new baseline.
Start with monitoring essentials, then choose the scale you need
After 7 days, monitoring pauses until you choose a paid plan.
7 days free · No credit cardMonitoring from €19/mo Compare plans
Start with the question you need to answer
Run a focused check without creating a project, then save the evidence only when continued monitoring is useful.
Questions 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 · 24 min
Server logs vs Search Console: which evidence answers which crawling question?
Choose the right evidence for HTTP requests, rendering, indexed URL state, and search performance, then join the sources without forcing unlike totals to match.
Read guide Crawling · 25 minThe canonical paradox: why Google can ignore your canonical and how to diagnose the conflict
Reconstruct the duplicate cluster, expose conflicting redirects, canonicals, sitemaps, links, and content, then choose the URL control that fits the resource.
Read guide Acquisition · 8 minHow to test llms.txt and WebMCP without assuming AI visibility
Generate and validate experimental files and tools without treating conformance as proof of AI visibility or compatibility.
Read guide Monitoring · 23 minINP after two years: what field data reveals about the interactions lab tests miss
Use CrUX, privacy-aware real-user monitoring, interaction phase attribution, and reproducible lab journeys to find the slow controls that Lighthouse TBT cannot observe.
Read guideFree Chrome extensions for technical SEO
Run focused checks directly on the page you are reviewing.
Technical SEO without blind spots